Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Fujio TSUMORI Last modified date:2022.04.21

Professor / Aerospace Structures and Structural Dynamics / Department of Aeronautics and Astronautics / Faculty of Engineering


Papers
1. Suparat Gaysornkaew, Danilo Vasconcellos Vargas, and Fujio Tsumori, Parameter Optimization via CMA-ES for Implementation in the Active Control of Magnetic Pillar Arrays, Proc. IEEE-CYBCONF, 10.1109/CYBCONF51991.2021.9464138, 2022.06, Pillared surfaces are the products of a surface modification technique that allow the implementation of active control methods by an outer source such as magnetic fields. Pillar arrays with magnetic tips exhibit different characteristics depending on the initial positional arrangement of the pillars and/or the environmental magnetic field conditions. This study develops methods for simulation and parameter optimization by machine learning to aid the investigation of pillar behaviors in various combinations of initial positions and magnetic fields. Optimization is performed using the co-variance adaptation evolution strategy (CMA-ES). The algorithm is tested to obtain preliminary results: (1) the maximum size of the pillar pitch at a given magnetic field; (2) the initial pillar arrangement of a 3-pillar unit cell and three settings of applied magnetic field-each corresponds to a predefined contact state of a three-stage paring pattern..
2. Gaysornkaew Suparat, and Fujio Tsumori, Active control of surface profile by magnetic micropillar arrays, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/abe698, 60, SC, 2021.06.
3. F. Tsumori and K. Tokumaru, Rotary actuation system for magnetic beads, Proc. MicroTAS 2020, 2020.10.
4. Shutaro Shigetomi, Haruna Takahashi, and Fujio Tsumori, Magnetic Actuator Using Double Network Gel, Journal of Photopolymer Science and Technology, 33, 2, 193-197, 2020.07.
5. Tsuyoshi Miyata, Kazuki Tokumaru, and Fujio Tsumori, Dimension Change during Multi-step Imprint Process and In-plain Compression, Journal of Photopolymer Science and Technology, 33, 2, 199-204, 2020.07.
6. Tsuyoshi Miyata, Kazuki Tokumaru, Fujio Tsumori, Combining multi-step imprinting with the in-plane compression method, Japanese Journal of Applied Physics, 10.35848/1347-4065/ab79ef, 59, 2020.03, In this study, a micro-patterning process is proposed and developed in order to obtain various functional properties on the surface of an object. Nano imprint lithography has recently been the focus of much attention, because of advantages such as high accuracy, low cost, and ease of operation. However, problems can occur during demolding when using this method, such as the destruction of high aspect patterns during the process. It is also, almost impossible to form an over-hanging pattern. In order to overcome these problems, we propose a multi-step imprinting process with an in-plane compression method. A hierarchical multi-scale pattern can be produced using multi-step imprinting, and the aspect ratio of the imprinted pattern can be increased by using the in-plane compression method. A hierarchical multi-scale pattern with a high aspect ratio was produced by combining the two methods. The effectiveness of the proposed method is demonstrated by the results of the experimentation..
7. Kazuki Maeda, Hayato Shinoda, Fujio Tsumori, Miniaturization of worm-type soft robot actuated by magnetic field, Japanese Journal of Applied Physics, 10.35848/1347-4065/ab7b18, 59, SI, 2020.03, Recently, many studies on bio-mimic soft robots have been reported. Among living organisms, the locomotion of soft-bodied creatures, such as snails, worms and nematodes, have been actively studied. These soft creatures locomote by deforming the muscles of the whole body into waveforms and propagating the waves of the deformation. This locomotion of soft creatures could be applicable to develop a worm-type soft robot, which can move in drain pipes and even in a human body. In this study, we developed worm-like robots that could generate wavy motion under a rotating magnetic field using silicone and magnetic rubber, and investigated their movement characteristics. In addition, based on a deformation experiment of a silicone cantilever with a single magnetic element inside made of the same material as a worm-like robot, we investigated the effect of the size of the worm robot for further miniaturization..
8. Hayato Shinoda, Fujio Tsumori, Development of Micro Pump Using Magnetic Artificial Cilia with Metachronal Wave, 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020, 10.1109/MEMS46641.2020.9056137, 497-500, 2020.01, Our study aims to realize artificial cilia with metachronal wave and to apply them to a micro pump. Metachronal wave is a typical motion observed in natural cilia motion of living organisms. To clarify the characteristics of fluid transport by metachronal waves, we fabricated two modes of artificial cilia that form symplectic and antiplectic metachronal waves, and drove them in silicone oil. We used particle imaging velocimetry (PIV) to visualize the flows generated by these metachronal waves. This is the first time that these two types of metachronal waves were generated in artificial cilia..
9. Fujio Tsumori, PARTICLE MANIPULATION ON MAGNETIC GRID PATTERN, Proc. MicroTAS 2019, 1142, 2019.10, I propose a simple manipulation system of micro magnetic particles in this paper. Magnetic particles to be actuated are put on a substrate which has a grid pattern of magnetic elements. We could manipulate a tiny particle precisely by 1 grid unit by macroscopic rotation of the magnet. Also, manipulation on the vertical wall was demonstrated. It is possible to apply this system also in a micro-channel..
10. Kazuki Tokumaru, Kazuhiro Yonekura, and Fujio Tsumori, Influence of Scale on Interfacial Pattern of Multilayered Imprinting, Proc. AWMFT2019, MF011, 2019.07, Nano Imprint lithography (NIL) is a technique that transfers a fine mold pattern to the surface of a work material. NIL is an excellent technology in terms of high productivity, accuracy, and resolution. Recently, a technology called multilayered imprint has been developed in which NIL is applied to processing of a multilayered material. In this process, it is possible to form not only surface of a workpiece, but also an interfacial pattern between the upper layer and the lower layer simultaneously. Using this technology, processing of functionally graded materials and fabrication of complex patterns using a sacrificial layer have been studied. Control of interface shape is necessary in multilayered imprint. The interface pattern can be controlled by the deformation characteristics, initial thickness, and so forth. In this research, we compared the interfacial pattern changes of imprinted multilayered materials in milli- and microscales. For multilayered imprint using multiple materials, it is important to know the flow of the resist and its dependence on the scale. If there is similarity in the relationship produced by the scale on the imprinted samples, a process design with a number of feedbacks could be realized. It also becomes easier to treat structures in the millimeter scale for the experiment. In this study, we employed micropowder imprint (μPI) for multilayered material imprint. A compound sheet of alumina powder and polymer binder was used for imprint. Two similar experiments in different scales, micro- and millimeter scales, were carried out. Results indicate that the interfacial patterns of micro- and millimeter-scale-imprinted samples are similar..
11. Hayato Shinoda, Seiji Azukizawa, Kazuki Maeda, Fujio Tsumori, Bio-mimic motion of 3D-printed gel structures dispersed with magnetic particles, Journal of the Electrochemical Society, 10.1149/2.0361909jes, 166, 9, B3235-B3239, 2019.01, The authors have proposed a fabrication process of “4D printer” for magnetic soft actuators. In this paper, we applied this 4D printer to bio-mimic field and show some examples using a gel material dispersed with magnetic powder. 4D printer is a recently developed process that can print out not only a 3-dimensional structure but also print deformations of the printed structure at the same time. We employed a UV-curable gel material. The material could be used in the same manner as the conventional 3D-printing process. We applied a magnetic field to set magnetic anisotropy in the curing portion during the building step. This anisotropy is set in each portion of the structure so that the printed structures could deform under an applied magnetic field. Using this technique, we demonstrated 2 kinds of biomimetic examples; one is a worm-type soft actuator and the other is an array of artificial cilia. The first example could crawl in a narrow gap. The second one could reproduce a metachronal wave, which is a phase propagation wave found on natural small organisms. We will also show a computational method to design the deformation of the structure..
12. Seiji Azukizawa, Hayato Shinoda, Fujio Tsumori, 4D-Printing System for Elastic Magnetic Actuators, 32nd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2019 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems, MEMS 2019, 10.1109/MEMSYS.2019.8870639, 248-251, 2019.01, We propose a 4D-printing process for soft actuators. 4D-printing system can print out not only a 3-dimensional object but also deformations in the printed structure simultaneously. In this paper, we propose a new 4D-printing system that utilizes soft resin dispersed with magnetic particles. The printed structure could be actuated by an applied magnetic field. The key in this system is magnetic anisotropy located at each portion of a structure. We show 2 demonstrations of printed actuators, and also a computational method to design the deformations of printed structures. This 4D-printing could be a powerful tool to fabricate micro soft actuators in the MEMS field..
13. Minori Furusawa, Kazuki Maeda, Seiji Azukizawa, Hayato Shinoda, Fujio Tsumori, Bio-mimic motion of elastic material dispersed with hard-magnetic particles, Journal of Photopolymer Science and Technology, 10.2494/photopolymer.32.309, 32, 2, 309-313, 2019.06, Recently, many researches on biomimetics have been reported, in which soft motions of natural creatures have also been targeted. Among them, cilia are attracting natural soft organ, which is an effective fluidic system in the natural world. Cilium is a simple hair-like organ; however, it works in a non-simple way. For example, beating pattern of natural cilium consists of 2 types of different stroke patterns; effective stroke and recovery stroke. We focused on a cilium as our target as a simple cantilever of a soft elastic material. We have already developed artificial cilia with magnetic elastomers. In this research, we compared cantilever beams with soft-and hard-magnetic particles. In this paper, we performed 2 experiments to compare the characteristics of cantilevers with 2 types of magnetic powders. In the first experiment, we utilized neodymium magnets that could be controlled the angle in order to observe the motion of beams in the static state. The latter one, we actuated beams in rotating magnetic fields to obtain dynamic behavior of an artificial cilium. As a result, we showed some differences between soft-and hard-magnetic materials..
14. Kazuki Tokumaru, Kazuhiro Yonekura, Fujio Tsumori, Imprint process with in-plane compression method for bio-functional surface, Journal of Photopolymer Science and Technology, 10.2494/photopolymer.32.315, 32, 2, 315-319, 2019.06, In this research, we propose an in-plane compression imprint method as a further development of the special micro patterning method to realize various biomimetic functional surfaces. Biomimetic is popular in the field of engineering in recent years. We focused on biomimetic functional surfaces of natural organisms. For example, micro scales on the wing of a morpho butterfly develop a bright blue color. The scales have specific dendrite-like nano-structures. We aim to mimic such functional surfaces by nano imprint lithography (NIL). NIL has high resolution and high productivity, and is known as a technology that can be applied to various materials. Conventional NIL requires mold release in the process, so it is difficult to form special shapes such as the overhang shape. To solve this problem, we propose an in-plane compression process. In our new process, work materials were imprinted on a stretched silicone film, and imprinted materials were compressed by in-plane compressive stress due to the elastic recovery of the silicone film. In this paper, we show some examples increasing the aspect ratio more than twice by the proposed process. We also show a strategy to form a complicated morpho’s surface pattern with an overhang structure having a high aspect ratio..
15. Atsushi Sekiguchi, Tomoki Nishino, Masayasu Aikawa, Yoko Matsumoto, Hiroko Minami, Kazuki Tokumaru, Fujio Tsumori, Hiroshi Tanigawa, The study of bile duct stent having antifouling properties using biomimetics technique, Journal of Photopolymer Science and Technology, 10.2494/photopolymer.32.373, 32, 3, 373-382, 2019.06, Biomimetics is a field of technologies based on imitating the functions and properties found in living organisms. The application of the super-water-repellent fine structure of lotus leaves to create waterproof products is a well-known example of biomimetics. The present study examined the surface structure of snail shells, which exhibit oleophobic properties oil repellency and explored the feasibility of recreating this structure on the inner surfaces of conventional biliary stents. Observations of snail shells under an electron microscope show a covering of extremely fine protrusions of around 200 nm in size. When water enters the pores between these fine protrusions, a film of water exhibiting super-nanohydrophilic structure forms on the shell. Because water and oil are immiscible, this film repels oil. We would expect stent occlusion to be less likely with a biliary stent having this structure on its inner surface. Biliary stricture caused by bile duct cancer or bile duct obstruction can lead to icterus and may, in serious cases, induce fatal hepatic failure. A surgical procedure that places indwelling biliary stents inside the biliary tract is sometimes performed to secure a passage for bile flow. However, conventional stents are prone to occlusion due to the accumulation of biliary sludge, resulting in the need for a second surgery to replace the stent. This problem is attributable to the polyethylene used to make the biliary stents; polyethylene is susceptible to the adhesion of cholesterol and fats found in the bile, eventually leading to stent occlusions. This paper reports our efforts to develop biliary stents that feature antifouling properties inspired by biomimetics to address this problem; specifically, the development of oleophobic inner stent surfaces featuring super-nanohydrophilic structures inspired by snail shell surfaces..
16. Atsushi SEKIGUCHI, Yoko MATSUMOTO, Hiroko MINAMI, Tomoki NISHINO, Hiroshi TANIGAWA, Kazuki TOKUMARU and Fujio TSUMORI, Study of the antifouling polymer sheet which used Biomimetics Technique, Proc. SPIE Nanoscience and Engineering, 10728-21, 2018.08.
17. Hayato Shinoda, Seiji Azukizawa, Kazuki Maeda, and Fujio Tsumori, Bio-mimic Motion of Gel Material Dispersed with Magnetic Particles, ECS Transactions, 10.1149/08801.0089ecst, 88, 1, 89-97, 2018.08, The authors proposed a fabricating process for soft actuators, named 4D printing system for magnetic gel materials. 4D printer is a recently developed process that can print out not only a 3-dimensional structure but also deformations in the printed structure at the same time. Our proposing process utilizes a gel material dispersed with magnetic particles as a starting material. We can design magnetic anisotropy in each portion of the printed object during additive manufacturing so that the printed structures could deform under an applied magnetic field. In this paper, we demonstrated 2 kinds of biomimetic examples by this printing system, a worm-type soft actuator and an array of artificial cilia. The first example could crawl in a narrow gap. The second one could reproduce a metachronal wave, which is a phase propagation wave found on natural small organisms. These demonstrations show that the proposed printing system could output variable bio-mimic soft actuators..
18. W. S.W. Harun, R. I.M. Asri, F. R.M. Romlay, S. Sharif, N. H.M. Jan, Fujio Tsumori, Surface characterisation and corrosion behaviour of oxide layer for SLMed-316L stainless steel, Journal of Alloys and Compounds, 10.1016/j.jallcom.2018.03.233, 748, 1044-1052, 2018.06, The stable oxide layer formed through thermal oxidation (TO) process on selective laser melted 316 L stainless steel (SLMed-316 L SS) substrate surface attested to assists in refining their corrosion resistance and observed to behave relatively inert in physiological conditions. The surface characterisation and corrosion behaviour of the oxidised SLMed-316 L SS are the primary focus of this study. The formation of the oxide layer on SLMed-316 L SS was investigated at constant ambient atmosphere and 700 °C temperature for three different soaking times (150, 200 and 250 h). The surface characterisation of the oxide layer was performed using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray Diffraction (XRD) to correlate the thickness of oxide layer and surface morphology after the TO treatment. Whereas, the electrochemical analysis was conducted using potentiodynamic polarisation to investigate the corrosion behaviour of the oxide layer. The finding disclosed an increase in the oxide layer thickness formation at prolonged exposure in ambient atmosphere. Also, the TO at 150 h showed an improved corrosion behaviour due to the presence of Fe2O3 and Cr2O3 layers. However, the extended soaking time showed no improvement towards the corrosion behaviour..
19. Atsushi Sekiguchi, Yoko Matsumoto, Hiroko Minami, Tomoki Nishino, Hiroshi Tanigawa, Kazuki Tokumaru and Fujio Tsumori, Study of the Antifouling Polymer Sheet which used Biomimetics Technique, Journal of Photopolymer Science and Technology, 31, 1, 121-128, 2018.06.
20. Seiji Azukizawa, Hayato Shinoda, Kazuki Tokumaru, and Fujio Tsumori, 3D Printing System of Magnetic Anisotropy for Artificial Cilia, Journal of Photopolymer Science and Technology, 31, 1, 139-144, 2018.06.
21. Shota Nakashima, Kazuki Tokumaru, Fujio Tsumori, Developing a method of fabricating microchannels using plant root structure, Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes, 10.7567/JJAP.57.06HJ07, 57, 6, 2018.06, Complicated three-dimensional (3D) microchannels are expected to be applied to a lab-on-a-chip, especially an organ-on-a-chip. There are fine microchannel networks such as blood vessels in a living organ. However, it is difficult to recreate the complicated 3D microchannels of real living structures. Plant roots have a similar structure to blood vessels. They spread radially and three-dimensionally, and become thinner as they branch. In this research, we propose a method of fabricating microchannels using a live plant root as a template to mimic a blood vessel structure. We grew a plant in ceramic slurry instead of soil. The slurry consists of ceramic powder, binder and water, so it plays a similar role to soil consisting of fine particles in water. After growing the plant, the roots inside the slurry were burned and a sintered ceramic body with channel structures was obtained by heating. We used two types of slurry with different composition ratios, and compared the internal channel structures before and after sintering..
22. Hayato Shinoda, Fujio Tsumori, Development of energy-harvesting system using deformation of magnetic elastomer, Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes, 10.7567/JJAP.57.06HJ05, 57, 6, 2018.06, In this paper, we propose a power generation method using the deformation of a magnetic elastomer for vibration energy harvesting. The magnetic flux lines in the structure of the magnetic elastomer could be markedly changed if the properly designed structure was expanded and contracted in a static magnetic field. We set a coil on the magnetic elastomer to generate electricity by capturing this change in magnetic flux flow. We fabricated a centimeter-scale device and demonstrated that it generated 10.5mV of maximum voltage by 10 Hz vibration. We also simulated the change in the magnetic flux flow using finite element analysis, and compared the result with the experimental data. Furthermore, we evaluated the power generation of a miniaturized device..
23. Kazuhiro Yonekura, Kazuki Tokumaru, Fujio Tsumori, Interfacial pattern changes of imprinted multilayered material in milli- and microscales, Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes, 10.7567/JJAP.57.06HG05, 57, 6, 2018.06, Nanoimprint lithography (NIL) is a technique that transfers a mold pattern of nanometer order to the surface of a resist material by heating and pressing. NIL is an excellent technology in terms of high productivity, accuracy, and resolution. Recently, NIL has been applied to the processing of different multilayered materials, in which it is possible to process multiple materials simultaneously. In this processing of multilayered materials, it is possible to form an interfacial pattern between the upper layer and the lower layer simultaneously with patterning on the mold surface. This interface pattern can be controlled by the deformation characteristics, initial thickness, and so forth. In this research, we compared the interfacial pattern changes of imprinted multilayered materials in milli- and microscales. For multilayered imprint using multiple materials, it is important to know the flow of the resist and its dependence on the scale. If there is similarity in the relationship produced by the scale on the imprinted samples, a process design with a number of feedbacks could be realized. It also becomes easier to treat structures in the millimeter scale for the experiment. In this study, we employed micropowder imprint (μPI) for multilayered material imprint. A compound sheet of alumina powder and polymer binder was used for imprint. Two similar experiments in different scales, micro- and millimeter scales, were carried out. Results indicate that the interfacial patterns of micro- and millimeter-scale-imprinted samples are similar..
24. Kengo Jinno, Fujio Tsumori, Room temperature impact deposition of ceramic by laser shock wave, Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes, 10.7567/JJAP.57.06HJ06, 57, 6, 2018.06, In this paper, a direct fine patterning of ceramics at room temperature combining 2 kinds of laser microfabrication methods is proposed. The first method is called laser-induced forward transfer and the other is called laser shock imprinting. In the proposed method, a powder material is deposited by a laser shock wave; therefore, the process is applicable to a low-melting-point material, such as a polymer substrate. In the process, a carbon layer plays an important role in the ablation by laser irradiation to generate a shock wave. This shock wave gives high shock energy to the ceramic particles, and the particles would be deposited and solidified by high-speed collision with the substrate. In this study, we performed deposition experiments by changing the thickness of the carbon layer, laser energy, thickness of the alumina layer, and gap substrates. We compared the ceramic deposits after each experiment..
25. Daiki Maede, Fujio Tsumori, Toshiko Osada, Kentaro Kudo, Visco-elastic control of elastomer with magnetic particles by applied magnetic field, IEEJ Transactions on Sensors and Micromachines, 10.1541/ieejsmas.138.48, 138, 2, 48-53, 2018.01, The purpose of this study was to explicate the mechanism of transition storage modulus and loss modulus under external magnetic field. Magneto-rheological elastomer (MRE) is expected to be used as damping material and actuator controlled by an external magnetic field. However, magnetic particles' behavior inside of MRE has not been explained completely. Especially, the mechanisms of loss modulus transition under external magnetic field has not been known well. We constructed a simple model with two magnetic particles, and try to make MRE behavior clear. In this report, we show a data of the viscoelastic property of MRE which consists of magnetic particles and polydimethylsiloxane (PDMS). The obtained viscoelastic property is explained by using two magnetic particles model..
26. Seiji Azukizawa, Hayato Shinoda, Kazuki Tokumaru, Fujio Tsumori, 3D printing system of magnetic anisotropy for artificial cilia, Journal of Photopolymer Science and Technology, 10.2494/photopolymer.31.121, 31, 1, 139-144, 2018.01, In this paper, we developed a new 3D-printing system for magnetic elastomer, and demonstrated to fabricate artificial cilia. Natural cilia are hair-like organ found in nature. They are effective fluidic system in the natural world that are widely observed on surfaces of microorganisms of creatures, such as Paramecium and throat surface of mammals. Recently, the motion of cilia has been analyzed and mimicked for developing soft actuator, for example, some studies on artificial cilia driven magnetically have been reported. They are small soft actuators, and there are various manufacturing methods for these actuators depending on materials and products. Among them, authors have already developed the concept of a printing system that not only forms a three-dimensional object but also prints out the deformation of the structure. This system can fabricate various shapes of soft actuators without any assembly. In this report, we utilized UV-curable urethane acrylate as a more flexible material than that used in the previous reports, and fabricated artificial cilia by the printer. We set magnetic anisotropy to each cilium and mimicked a metachronal wave, sequential action of plural cilia that causes effective flow..
27. Atsushi Sekiguchi, Yoko Matsumoto, Hiroko Minami, Tomoki Nishino, Hiroshi Tanigawa, Kazuki Tokumaru, Fujio Tsumori, Study of the anti-fouling polymer sheet which used biomimetics technique, Biosensing and Nanomedicine XI 2018 Biosensing and Nanomedicine XI, 10.1117/12.2319698, 2018.01, It has long been known that snail shells have an excellent anti-fouling function, as it is said that there are no dirty snails. The snails encountered during the baiu rainy season in Japan always have clean, shining shells. These shells are known to have convex-concave nanoscale structures on their surface (roughness on the order of approximately 200 nm) that promote the formation of a film of water on the shell surface, creating an ultra-hydrophilic nanoscale structure that repels oils and stains
[1]
. Creating such an ultra-hydrophilic nanoscale structure on a polymer surface should allow us to produce an antifouling polymer sheet. Additionally, producing a tube from a polymer film with this nanoscale structure should make it possible to create a tube with high antifouling properties. The field of technologies based on imitating properties and structures observed in living organisms in nature is called biomimetics
[2]
. This paper reports on the development of antifouling sheets and tubes with antifouling functions fabricated using the above technologies. The first step was creating a mold with an artificial snail shell structure using ZrO
2
nanoparticles [3], whose patterns were then transferred to polymer with nanoimprint technology
[4-5]
. These antifouling sheets and tubes are expected to see wide use for medical applications..
28. Atsushi Sekiguchi, Yoko Matsumoto, Hiroko Minami, Tomoki Nishino, Hiroshi Tanigawa, Kazuki Tokumaru, Fujio Tsumori, Study of the antifouling polymer sheet which used biomimetics technique, Journal of Photopolymer Science and Technology, 10.2494/photopolymer.31.101, 31, 1, 121-128, 2018.01, It has long been known that snail shells have an excellent anti-fouling function, as it is said that there are no dirty snails. The snails encountered during the baiu rainy season in Japan always have clean, shining shells. These shells are known to have convex-concave nanoscale structures on their surface (roughness on the order of approximately 200 nm) that promote the formation of a film of water on the shell surface, creating an ultra-hydrophilic nanoscale structure that repels oils and stains. Creating such an ultra-hydrophilic nanoscale structure on a polymer surface should allow us to produce an antifouling polymer sheet. Additionally, producing a tube from a polymer film with this nanoscale structure should make it possible to create a tube with high antifouling properties. The field of technologies based on imitating properties and structures observed in living organisms in nature is called biomimetics. This paper reports on the development of antifouling sheets and tubes with antifouling functions fabricated using the above technologies. The first step was creating a mold with an artificial snail shell structure using ZrO
2
nanoparticles, whose patterns were then transferred to polymer with nanoimprint technology. These antifouling sheets and tubes are expected to see wide use for medical applications..
29. Kazuki Tokumaru, Simon Hunt, Fujio Tsumori, Fabrication of 3D ceramic micro channels by imprinting method, 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018, 522-524, 2018.01, Ceramic materials show superior properties in heat resistance, corrosion resistance, chemical resistance, strength, etc. compared to polymer materials. Thus, the ceramics are expected in many fields to be replaced from conventional polymer. However, ceramics are fragile and micro fabrication of channel is challenging. In this work, we developed the fabrication process of 3D ceramic micro channels by imprinting a laminated sheet of 2 compound sheets and a sacrificial sheet in between them. Our ceramic micro channels could be useful for highly efficient solid oxide fuel cells (SOFC), or micro electro mechanical systems (MEMS) used in harsh environments where polymer materials could not be applicable..
30. Shota Nakashima, Kazuki Tokumaru, Fujio Tsumori, Glass microchannels fabricated by live plant root, 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018, 535-537, 2018.01, We fabricated silica microchannels by using a plant root as a template. A root spreads and branches three-dimensionally and has the finest parts, which are called root hair, at the root tips. The thickness of root hair is about 10 μm. We focused on this structure to apply to the μTAS field. We put a germinated plant seed so that the root grew in a compound material with silica particles. The compound with the root was heated to burn out the plant and sinter the material. In this way, we obtained the transparent sintered body with the root-shaped cavity. We also tried to control the growth of the root. We grew plants in the patterned channel filled with aqueous gel material and observed the root pattern..
31. Hayato Shinoda, Seiji Azukizawa, Fujio Tsumori, Impact of metachronal wave of magnetic artificial cilia on micro-pump efficiency, 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2018, 679-681, 2018.01, Cilia are hairlike organs that are found on the surface of small organisms in water such as paramecia. The movement pattern of cilia is known as a metachronal wave, which realizes efficient fluid transport. Our study aims to mimic the metaclonal wave of cilia and apply it to micro pumps. Artificial cilia fabricated using elastic material dispersed with magnetic particle could generate a metachronal wave by applying a rotating magnetic field. The experimental results showed that the developed device was able to make flow, and the cilia with metachronal wave improved the flow rate compared with cilia with synchronous motion..
32. Kazuki TOKUMARU, Fujio TSUMORI, Kentaro KUDO, Toshiko Osada, K. Shinagawa, Development of multilayer imprint process for solid oxide fuel cells, Japanese Journal of Applied Physics, 10.7567/JJAP.56.06GL04, 56, 06GL04, 2017.06, Solid oxide fuel cells (SOFCs) are fuel cells made of ceramics. To increase the SOFC energy density, we developed an SOFC with a wavy electrolyte layer. As a wavy electrolyte has a larger reaction surface area than a flat electrolyte, a higher energy density could be obtained. Our proposed process is named micro-powder imprint (µPI) with a multilayer imprint process that is useful for fabricating a microscale pattern on a ceramic sheet such as an SOFC electrolyte layer. µPI is based on nanoimprint lithography; therefore, it also exhibits the same advantages of high resolution and mass productivity. The starting material for µPI is a compound sheet containing ceramic powder and binder materials consisting of thermoplastic resin. In this study, two different sheets were stacked into one sheet as a multilayer sheet for the µPI process to form a wavy compound sheet. As the initial state of the stacked sheet, including the mechanical properties of each layer, affects the final wavy shape, we changed the material composition. As a result, the SOFCs unit cell with a wavy electrolyte was fabricated. Note that the anode layer was formed at the same time. After adding the cathode layer, we succeeded in preparing a complete cell for testing power generation..
33. Ryuma MARUME, Fujio TSUMORI, Kentaro KUDO, Toshiko Osada, K. Shinagawa, Development of magnetic-field-driven artificial cilium array with magnetic orientation in each cilium, Japanese Journal of Applied Physics, 10.7567/JJAP.56.06GN15, 56, 06GN15, 2017.05, Artificial cilia actuated by an applied magnetic field have been developed. In our previous report, we demonstrated actuated cilia of a few millimeters scale, which were fabricated by cutting a magnetic elastomer sheet. The fabricated artificial cilia worked similarly to natural cilia;
however, they had a much larger structure than natural ones, and showed difficulty for use in pumping systems in micro-total analysis systems
(µTAS) fields. Thus, our goal is further miniaturization. In this study, we introduce a new process of fabricating smaller pillar structures with a
magnetic orientation in each pillar by ultraviolet (UV) laser machining. We also give different orientations to groups of pillars by the alternate laser machining of the mold and casting processes..
34. Toshiko Osada, Kentaro Kudo, Ryuichi Hashikawa, Fujio TSUMORI, Hideshi Miura, Control the Deformation of MIM Parts by the Powder Size Distribution, Proc. World PM2016, 2016.10, Metal Injection Molding (MIM) process is suitable for fabricating small parts in large quantity. In this work, relatively large and complex shaped parts were prepared thorough MIM. In order to decrease the deformation of sintered parts, powders of different sizes were mixed. The effect of powder particle distribution and powder loading on the distortion of complex shaped compacts were investigated and evaluated. Smaller deformation of the large and complex shaped parts could be realized by using mixed powder with smaller particle..
35. Naoto Yoshigai, Kentaro Kudo, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Anisotropic Mechanical Properties of Ni-base Superalloy Compacts by Direct Laser Forming Technology, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.427, 63, 7, 427-433, 2016.07, As Ni-based superalloy has poor workability, direct laser forming (DLF) would be a powerful tool for fabricating the complex shaped Ni-based superalloy parts. We focused on the microstructure of the parts produced by DLF, the crystal grains of which grow along the building direction. This anisotropic microstructure is one of the major features of the parts produced by DLF, and which may cause anisotropic mechanical properties.In this work, the optimum laser-forming conditions such as laser power, laser scan speed, and powder feeding rate were determined by evaluating the density of the produced parts. Three types of tensile test pieces and two types of fatigue test pieces were fabricated in different building direction. They had higher ultimate tensile strength than that of JIS standards in wrought materials. However, their elongation was lower than that of JIS standards, and also the dispersion of elongation was large. On the other hand, fatigue limit was a little lower than the standard value. It was confirmed that the mechanical properties of Ni-based superalloy parts produced by DLF were different by a difference in building direction.
.
36. Kentaro Kudo, Hiroyoshi Ishimitsu, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Static and Dynamic Fracture Characteristics of the MIM Ti-6Al-4V Alloy Compacts Using Fine Powder, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.445, 63, 7, 445-450, 2016.07, Titanium alloys show not only the excellent mechanical properties but also good biocompatibility. However, they show normally poor machinability, which become the disadvantage of high processing cost. Metal injection molding (MIM) process is one of the techniques to improve that drawback. Because MIM process can produce the three dimensional complex shaped parts at low cost. Ti-6Al-4V is a typical titanium alloy and the MIM compacts show high static strength as same as wrought materials. However, their fatigue strength is a little low level as compared to wrought materials. To improve the mechanical properties of Ti-6Al-4V alloy compacts, it is important to refine the grain size and increase the relative density. In this study, the effects of the particle size of the powders on the mechanical properties were investigated. The use of a fine powder improved the mechanical properties because of their high density. Moreover, the crystal grain growth was restrained as compared to the case of the same relative density using larger powder..
37. Jungho CHOE, Toshiko Osada, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, Effect of Minor Boron Addition on the Fatigue Strength and High Temperature Properties of Injection Molded Ti-6Al-4V Compacts, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.451, 63, 7, 451-456, 2016.07, Ti-6Al-4V alloy has attracted a lot of attention from the automotive and aerospace industries because of their outstanding specific strength and corrosion resistance. On the other hand, Ti-6Al-4V alloy has normally poor workability because of the low thermal conductivity and the low elastic modulus. Metal injection molding (MIM) process is expected to manufacture a complex part with near net shape and reduce the manufacturing cost. However, Ti-6Al-4V alloy compacts by MIM process had a problem of low fatigue strength compared to wrought material.In this study, we tried to add a minor amount of boron using TiB2 powder for improving the fatigue strength. Addition of boron resulted refinement of the grain size of lamellar structure, which lead to increase the high cycle fatigue strength and fatigue limit. In addition, tensile properties at high temperature was investigated..
38. Toshiko Osada, Yusuke Kanda, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, High Temperature Mechanical Properties of TiAl Intermetallic Alloy Parts Fabricated by Metal Injection Molding, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.457, 63, 7, 457-461, 2016.07, It is not easy to fabricate the complicate shaped titanium aluminide (Ti-Al) components by conventional methods such as machining or forging, and casting leads to inhomogeneous microstructures. Metal injection molding (MIM) has the potential to be a cost-efficient process and near net shape technique, especially for the complex shaped mass-produced components. In this study, Ti-Al intermetallic alloy compacts were fabricated through MIM technique. Sound compacts with over 95 % of relative density and without any warpage or defects were obtained thorough MIM process. Different microstructures of duplex, near lamellar, and full lamellar were obtained by changing the sintering temperature. Their tensile strength at room and high temperature is 85 to 90 % of that of wrought material. Tensile strength of MIM compact would be expected the same level with cast materials by optimization of sintering conditions, densification by HIP treatment and so on..
39. Kentaro Kudo, Sek Kin Wai, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Improvement of Mechanical Properties of Injection Molded Ni-base Superalloy Compacts, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.462, 63, 7, 462-467, 2016.07, Superalloy has been used for aerospace application because of their excellent attributes of high strength and corrosion resistance at high temperature. Inconel 718 is one of the representative Ni-based superalloy. Generally, superalloy has poor workability, especially high tool wear by machining, so that it is not easy to produce the components of complex shaped parts at low cost. To overcome such as the problem, metal injection molding (MIM) process would be a useful technique which offers net shape production, high design flexibility, and high cost efficiency for mass production. In this study, gas-atomized fine alloy powder of Inconel 718 was prepared for MIM process, and the mechanical properties of injection molded compacts were investigated. The relative density over 99.7 %, which is much higher than density of usual MIM compacts, was obtained by supersolidious liquid-phase sintering. Furthermore, injection molded Inconel 718 showed high fatigue strength comparable to the wrought materials, because the pore size of the MIM compacts was smaller than the inclusion size of wrought materials. And it was found that the grain size was more dominant than pore size against the fatigue failure of MIM Inconel 718 with near full density..
40. Ryuichiro Hashikawa, Toshiko Osada, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.473, 63, 7, 473-478, 2016.07, Metal Injection Molding (MIM) is an effective way to manufacture small components with low cost and high precision. However, in the case of large components, it becomes difficult to control the distortion and cracking because of the big shrinkage during debinding and sintering process. Therefore it is important to optimize the condition of each process to reduce the distortion of MIM compacts. Moreover, powder size is also one of the most important parameters. The small particle powder shows high shrinkage and high density as compared to large particle powder during sintering process. In this study, blending of both powders was conducted and the influence of powder size distribution on the distortion of complex shaped parts was evaluated. A coordinate measuring machine, which is a 3D device for measuring the physical geometrical characteristics of an object, was used to measure the distortion. Finally, through controlling the distribution of particle size, distortion of the comparatively large and complex shaped MIM compacts was successfully restrained..
41. Fujio TSUMORI, Simon Hunt, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Wavy Micro Channels in Micropatterned Ceramic Sheet Formed by Combined Process of Laser Beam Machining and Imprinting, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.511, 63, 7, 511-518, 2016.07, Micro channels made of polymers are commonly used for MEMS and μTAS (micro-total analysis system) devices. In this research, we developed a process for fabricating a ceramic sheet with micro channels. The developed process is based on powder metallurgy process. A compound material, a mixture of ceramic powder and polymer, was prepared as sheet material. We employed laser machining to machine the sacrificial layer to form micro channels inside the sheet. We also employed imprinting, which is a process of pressing with a mould while heating, to form a structure with surface patterns and micro channels curving along with it. After the imprinted sheet was debound and sintered by heating, a ceramic sheet with micro-surface patterns and micro channels was obtained. As ceramics have high heat durability and low chemical reactivity, ceramic micro channels can be used for flow sensors or chemical reaction testers operated in harsh environments, such as high temperature or mechanical parts operated with reactive chemicals. In addition, by imprinting wavy patterns, the surface area can be increased. Therefore high efficiency heat exchangers can be built. Moreover, this method can be applied on SOFCs (solid oxide fuel cell) by fabricating YSZ (yttria stabilized zirconia) micro channels..
42. Fujio TSUMORI, Kazuki Tokumaru, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Development of Corrugated Ceramic Sheet for SOFC Electrolyte by Micro Imprint Process, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.519, 63, 7, 519-523, 2016.07, Yttria-stabilized zirconia (YSZ) has been used for an electrolyte of solid oxide fuel cells (SOFC). To enhance the efficiency of SOFC, we developed a corrugated, or wavy-shaped, YSZ sheet for the electrolyte. As the corrugated sheet has larger surface area than a flat-type sheet, higher energy density can be obtained. We have proposed micro powder imprint (μPI) with multi-layer imprint process to fabricate micro scale pattern on the both surfaces of a thin YSZ sheet. The μPI is a combined process of nano imprint lithography and powder metallurgy; the resolution is high, and the process is mass-productive. In this work, we selected a compound material containing YSZ powder and a binder consisting of thermoplastic resin as a starting material. The compound sheet was prepared by tape casting from slurry and was imprinted by a fine-patterned mold with stacked on a silicone rubber sheet. The silicone rubber was so flexible that micro patterns on the both sides of the compound sheet was obtained after imprint. In the present work, the process condition of μPI and the heat program of debinding and sintering were also considered. As a result, a wave-type sintered YSZ sheet without significant defects was successfully obtained..
43. Fujio TSUMORI, Hidenori Kawanishi, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Development of three-dimensional printing system for magnetic elastomer with control of magnetic anisotropy in the structure, Japanese Journal of Applied Physics, http://dx.doi.org/10.7567/JJAP.55.06GP18, 55-6S1, 06GP18, 2016.06, In this paper, we report on a new system of three-dimensional (3D) printing for a magnetic elastomer that contains magnetic particles. Not only can we fabricate a three-dimensional structure, but we can also control the magnetically anisotropic property o.
44. Fujio TSUMORI, Ryuma Marume, Akinori Saijou, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Metachronal wave of artificial cilia array actuated by applied magnetic field, Japanese Journal of Applied Physics, http://dx.doi.org/10.7567/JJAP.55.06GP19, 55, 06GP19, 2016.05, In this paper, a biomimetic microstructure related to cilia, which are effective fluidic and conveying systems in nature, is described. Authors have already reported that a magnetic elastomer pillar actuated by a rotating magnetic field can work like a na.
45. Fujio TSUMORI, Lijan Shen, Toshiko Osada, Hideshi Miura, Hierarchical patterning by multi-step micro-imprinting with layered materials, Manufacturing Review, 10.1051/mfreview/2015008, 2, 2015.05, The objective of the work reported in this paper is to create multi-scale and hierarchical surface structures using a simple imprinting process. The hierarchical structures can be fabricated with only simple patterned molds by proposed multi-step imprinting process, instead of using a high cost hierarchical-patterned mold. In the proposed process, the starting material is a layered sheet material. The layered sheet is pressed by a mold with a finer pattern, and subsequently pressed by a mold with a rougher pattern. A pure polymer sheet is employed as the upper layer, which will be removed during heating processes as a sacrificed layer, while the lower layer is a compound material of polymer and ceramic powder. After heating process, ceramic compact is sintered and formed a full-dense patterned sheet. By the proposed multi-step imprinting process with a layered material, ceramic sheets with micro hierarchical pattern can be fabricated with low cost. In the present work, poly(vinyl alcohol) (PVA) was prepared as the upper layer, and a compound material of alumina powder and PVA as a lower layer. Molds with finer and rougher patterns were also prepared for multi-step imprinting. As a result, a hierarchical structure on a thin ceramic sheet could be fabricated..
46. Fujio TSUMORI, Simon Hunt, Toshiko Osada, Hideshi Miura, Formation of ceramic micro-channel by combination of laser beam machining and micro powder imprinting, Japan Society of Applied Physics, 10.7567/JJAP.54.06FM03, 54, 6S1, 06FM03-1-06FM03-5, 2015.05, Microchannels made of polymers are commonly used for MEMS and micro-total analysis system (µTAS) devices. If a micro-channel structure can be constructed of a more stable material, the analysis of more reactant chemicals in harsher environments can be realized. In this research, we developed a process for fabricating a ceramic sheet with micro-channels. The developed process is based on powder metallurgy process. A compound material, a mixture of ceramic powder and polymer, was prepared as the sheet material. We employed laser machining to machine the sacrificial layer to form micro-channels inside the sheet. We also employed imprinting to form a structure with surface patterns and microchannels curving along with it. After the imprinted sheet was debound and sintered by heating, a ceramic sheet with micro-surface patterns and microchannels was obtained..
47. Fujio TSUMORI, Akinori SAIJOU, Toshiko Osada, Hideshi Miura, Development of actuation system for artificial cilia with magnetic elastomer, Japanese Journal of Applied Physics, 10.7567/JJAP.54.06FP12, 54, 6S1, 06FP12-1-06FP12-5, 2015.05, In this paper, we describe the development of magnetically actuated artificial cilia. Natural cilia are a highly efficient device that produces flow under a small-Reynolds-number state. There are two important characteristics of natural cilia; one is asymmetric movement, which is composed of effective and recovery strokes, and the other is the phase difference of a stroke in each cilium in an array that will produce a metachronal wave. In this paper, we propose an actuation system for artificial cilia composed of a silicone elastomer and multiparticle chains of a magnetic material. The applied magnetic field is controlled by rotation of a permanent magnet. This rotating magnetic field induced an asymmetric movement similar to that of a natural cilium. We also changed the orientation angle of multiparticle chains to control the phase difference of a stroke in each artificial cilium. This technique would help to realize metachronal waves of artificial cilia..
48. Deformation Control of Large Sized MIM Parts by Changing the Powder Size Distribution.
49. Lijan SHEN, Fujio TSUMORI, XU YANG, Toshiko Osada, Hideshi Miura, Hierarchical patterning by multi-step micro imprinting process for layered material, 7th Asia Workshop on Micro/Nano Forming Technology, 2014.11, The objective of this paper is to create multi-scale and hierarchical surface structures using simple imprinting technique. The hierarchical structures are found in the natural world; for example, lotus leaves, which are famous for high hydrophobic surface. A multi-step imprinting process was developed in this work to fabricate such kind of bio-mimetic surface structure. The hierarchical structures can be fabricated with only simple patterned molds. Another characteristic of the proposed process is that the starting material is a layered sheet material. The layered sheet was pressed by a mold with a finer pattern, and subsequently pressed by a mold with a rougher pattern. Both fine and rough patterns were obtained on the interface between the upper and lower layers after these multi-step imprinting. A polymer sheet was employed as the upper layer, which will be removed during heating processes. After removing the upper layer, hierarchical surface structure is left on the surface. In the present work, poly(vinyl alcohol) (PVA) was prepared as a upper layer, and a compound material of alumina powder and PVA as a lower layer. The PVA can be easily removed by heating. Molds with finer and rougher patterns were also prepared for multi-step imprinting. As a result, a hierarchical structure on a thin ceramic sheet was fabricated..
50. Fujio TSUMORI, XU YANG, Yuki TANAKA, Toshiko Osada, Hideshi Miura, Micrometer-scale Imprinting Process for Ceramic Sheet from Powder Compound Material, 11th International Conference on Technology of Plasticity, ICTP 2014, 10.1016/j.proeng.2014.10.169, 81, 1433-1438, 2014.10, A micro patterning process for thin ceramic sheets is proposed and developed in this paper. Thin sheets with a micro pattern have been expected to improve performance of solid oxide fuel cell. The authors focused on imprinting and powder metallurgy processes, and have developed the combined process, which has been named micro powder imprinting process. In this process, ceramic powder and polymer binder materials are mixed with pure water by milling machine. After drying out the water from the slurry, a thin compound sheet was obtained. Subsequently, the sheet was pressed using a fine patterned mold with heating to transcribe a micro pattern on the sheet. Finally, the imprinted sheet was heated for removing the polymer binder and for sintering. As further improvement of the process, a compound sheet was stacked on a pure polymer sheet during the imprint process to transcribe a micro pattern on the both sides of the sintered sample. The technique is useful for improved solid oxide fuel cell..
51. Yuto NAGAMACHI, Yasuhiro YAMAMOTO, Fujio TSUMORI, Comparison of Experimental and FEM Simulation Results for Manufacturing a Valve Body, Proc. 11th International Conference of Hot Isostatic Pressing, 71-78, 2014.06, In the field of the industrial use of the PM-HIP process, it is a common understanding that dimensional accuracy and shape are critical factors as well as the material yield. Thus, the precise prediction of shrinkage during HIP treatment is becoming more important as product sizes have become larger in recent years. For this reason, computer simulation technology has been utilized by many engineers in the PM-HIP field. In this study, a quarter-sized model of an actual valve made of Stainless Steel 316L for offshore drilling rigs or cooling water lines of a PWR (pressurized water reactor) is manufactured and tested along with the FEM simulation of the shrinkage phenomenon. Both results are compared, especially applying stress on the dimensional accuracy using HIP. Three dimensional measurement by a laser scanning system is used for the experiment because the conventional two dimensional methods have not been necessarily satisfactory depending on the shape of the object. By the use of this measurement technique, a significant improvement in the accuracy is achieved. Details of the experimental data are discussed..
52. Fujio TSUMORI, Yuki TANAKA, XU YANG, Toshiko Osada, Hideshi Miura, Development of improved solid oxide fuel cell electrolyte sheet by microimprinting for layered material, Japanese Journal of Applied Physics, doi:10.7567/JJAP.53.06JK02, 53, 06JK02-1-06JK02-6, 2014.05, At present, the solid oxide fuel cell (SOFC) is attracting much attention because it possesses the highest power generation efficiency among many types of fuel cell, and SOFC emits only water that does not harm the environment. Recently, the electrolyte structure for SOFC has been processed into various forms to increase the efficiency of SOFC. In this work, we tried to improve the performance of SOFC by changing the mesostructure on the interfaces between the electrolyte and electrodes. This hundred-micrometer-scaled mesostructure has been proposed to increase the reaction on the interfaces. However, there has been no effective method of fabricating the cells with the microstructure along the interfaces. We have already proposed the micro powder imprint (µPI) method to create fine patterns on ceramic samples. In this study, the µPI method for layered material was newly developed to fabricate the micropatterns on both sides of an electrolyte sheet. The optimization of process parameters, such as compounding ratio, debinding temperature, and sintering temperature, was examined to obtain desired wavy patterns on both surfaces of the electrolyte sheet..
53. Micro Patterning on the Sheets of Ceramic Material by a Combined Process of Laser Machining and Powder Metallurgy.
54. XU YANG, Fujio TSUMORI, Toshiko Osada, Hideshi Miura, Improvement of solid oxide fuel cell by imprinted micropatterns on electrolyte, Micro & Nano Letters, 10.1049/mnl.2013.0310, 8, 10, 571-574, 2013.10, A study is presented of an improved interfacial structure between the electrode and electrolyte of a solid oxide fuel cell. An imprint process,
which is considered as a powerful tool to transcribe nano to micropatterns on materials, was employed to imprint fine patterns onto a ceramic
sheet of electrolyte. In the presented work, a sheet of ceramic compound material was prepared, and micropatterns were imprinted on its
surface. After debinding and sintering, a dense ceramic sheet with fine micropatterns was obtained. To investigate the effect of
micropatterns on the overall performance of a fuel cell, three kinds of electrolyte sheets with different surface patterns were employed for
this technique. After applying anode and cathode layers, the three fuel cell samples were assembled to test the cell performance. The
result was that the finer pattern caused better performance in the three samples by exhibiting the highest overall voltage and power
density, and the effective factors of patterns on ion conductivity were discussed as well. Based on the investigation, some further
improved three-dimensional microstructures were proposed and fabricated by the method of micro powder imprinting (μPI)..
55. Fujio TSUMORI, XU YANG, HYUNGOO KANG, Toshiko Osada, Hideshi Miura, SIMULATION OF DEFORMATION OF LAYERED SHEET DURING MICRO POWDER IMPRINTING PROCESS, XII International Conference on Computational Plasticity, 1267-1273, 2013.09, This paper reports simulation of deformation during micro powder imprinting process, which is a newly developed process to form micro patterned surface on ceramic sheets. The process is proposed as a combined process of traditional hot-embossing and powder metallurgy. A compound sheet of powder material and polymer binder is pressed by a mold to be transcribed a micro-pattern on its surface. After pressing, the binder is removed by heating, and the sheet is sintered. Finally dense ceramic sheet with fine pattern can be obtained. This process can be used also for layered sheet of two different materials. By using this layered sheet, we can make a pattern not only on the surface of the upper layer but also along the interface between each layer. Of course, the same pattern with the mold’s shape can be transcribed on the surface, while, there can be found another micro pattern along the interface. These two patterns of the surface and the interface are useful to fabricate ceramic sheet with patterns on its both surfaces. For example, if a compound sheet was used as an upper layer and a pure organic sheet as a lower, the lower organic layer can act as a sacrificed layer. After debinding and sintering, only the upper layer remains, which has micro-patterns on the both sides. The shape of interface between layers can be controlled by changing properties of layers. It could be also influenced by the imprinting conditions, such as temperature and pressure. In order to design the shape of the interface, finite element analysis was employed in the present paper. Mooney-Rivlin’s deformation model was used to express deformation of materials during imprinting. In this paper, we compared the simulated results with experimental data to show effectiveness of the present simulation method..
56. TSUMORI Fujio, HATAMA Kenji, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Magneto-FEM Analysis for Micro Actuator using Array of Magnetic Elements, IEEE-NEMS2013, 845-848, 2013.04, This paper reports a magnetic actuator using interaction between micro magnetic elements. It was already reported that the present actuator can work even if the structure was miniaturized to nano-scale. In the present work, simple fabrication process with photolithography and PDMS casting was employed to obtain beam type structures with micro array of magnetic elements on their surface. Two samples with simple grid patterns were prepared for testing. These samples had the same grid pattern but different orientation, which caused directly opposite bending deformation under the same applied magnetic field. We used magneto finite element method (FEM) to explain the behavior of the present actuators..
57. XU YANG, TSUMORI Fujio, HASHIMOTO Seiya, TAKAHASHI Masashi, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Improvement of Solid Oxide Fuel Cell by Imprinted Patterns on Eelectrolyte, IEEE-NEMS2013, 887-890, 2013.04, This paper reports an improved interfacial structure between electrode and electrolyte of Solid Oxide Fuel Cell (SOFC). We employed an imprint process to give fine patterns onto a ceramic electrolyte sheet. The imprint process is a powerful tool to transcribe nano- to micro-patterns on materials. In the present work, a sheet of ceramic compound material was prepared, and micro patterns were given on the sheet. After debinding and sintering, dense ceramic sheet with fine patterns were obtained. We prepared three kinds of electrolyte sheets with different surface patterns using this technique. After applying anode and cathode layers, the three fuel cell samples were assembled to test the cell performance. It was resulted that the finer pattern caused the best performance in the three samples..
58. H. G. Kang, K. Yamada, T. Osada, F. Tsumori, H. Miura, Mechanical Properties of Direct Metal Laser Formed Ti Alloy Parts, Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition, 18F-T4-7, 2013.02.
59. Takahisa NOMOTO, HYUNGOO KANG, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, K. Kato, Formation of Bronze Porous Layer on the Ferrous Substrate by Laser Forming, Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition, 18F-T4-8, 2013.02.
60. W. S. W. Harun, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Evaluation of Heterogeneous Microstructure for Ultrahigh Strengthening MIM Sintered Low Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 16B-T5-21, 2013.02.
61. S. Virdhian, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Distortion of Large and Complex Shaped Ti and Ti-6Al-4V Alloy Compacts by Metal Injection Molding Process, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 16B-T5-23, 2013.02.
62. S. Morinaka, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Mechanical Properties of Rene95 Superalloy Compacts by Metal Injection Molding, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T5-61, 2013.02.
63. F. Tsumori, S. Hashimoto, M. Takahashi, Y. Xu, H. Kang, T. Osada, H. Miura, Micro Imprinting Process for Surface Patterning of Ceramic Sheet, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T6-72, 2013.02.
64. F. Tsumori, H. Kang, T. Osada, H. Miura, Particle Packing Simulation using Vibration Method, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T8-81, 2013.02.
65. T. Hazama, T. Tokuoka, H. Kang, T. Osada, F. Tsumori, H. Miura, Effect of Mezzo-heterogeneous Microstructure on Mechanical Properties of Fe-Ni Sintered Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 17A-T9-14, 2013.02.
66. T. Tokuoka, T. Yamamoto, K. Kudo, F. Tsumori, T. Nishioka, H. Miura, Effect of Heterogeneous Microstructure on Mechanical Properties of Sintered Ni Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 17A-T9-15, 2013.02.
67. Wan Sharuzi WAN HARUN, Toshiko OSADA, Hyungoo KANG, Fujio TSUMORI, Hideshi MIURA, Investigation of Fine Heterogeneous Microstructure on the Mechanical Properties of MIM Fe-Ni Alloy Steels, J. Jpn. Soc. Powder Powder Metallurgy, 59, 12, 677-684, 2012.12.
68. S. Virdhian, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Evaluation and Analysis of Distortion of Complex Shaped Ti-6Al-4V Compacts by Metal Injection Molding Process, Key Engineering Materials, doi:10.4028/www.scientific.net/KEM.520.187, 520, 187-194, 2012.09, Titanium and its alloys have been widely used for medical and aerospace applications
because of their excellent attributes of high specific strength, corrosion resistance, and
biocompatibility. However, it is not easy to produce the complex shaped parts due to their poor
castability and machinability. Metal injection molding (MIM) is one of suitable processing
technique to produce the complex shaped parts in order to reduce the manufacturing cost. In this
study, complex shaped Ti-6Al-4V compacts was prepared by MIM process for airplane application.
The effects of high molecular binder content and different compact’s set-up during thermal
debinding on the distortion of complex shaped compacts were measured and evaluated. The binder
with 10 % APP (Atactic polypropylene) was found to have better shape retention for the parts.
Furthermore the results indicate that high distortion occurs at early stage of thermal debinding
process. The use of supports during thermal debinding can significantly reduce the distortion of the
final parts..
69. Kenji Hatama, Fujio Tsumori, Yang Xu, Hyungoo Kang, Toshiko Osada, Hideshi Miura, Magnetic Micro Actuator Using Interactive Force between Magnetic Elements, Japanese Journal of Applied Physics, 51, 06FL14-1-4, 2012.07, In micro electro mechanical system (MEMS) field, there have been used many kinds of actuators. Among them, the magnetic actuator has some
advantages. As magnetic micro actuators do not need electric wiring for energy supply, the structure can be simple and be downsized easily.
However, the magnetic force would be very small with downsizing, which is the main problem for conventional magnetic actuators. We propose a
new type actuator using magnetic interaction force between magnetic elements to solve this matter. This actuator can work even if it gets smaller,
because the interaction force is dominant in a microscopic region. We fabricated the actuator by a casting process with photolithography using the
SU-8 resist material. Then, the structure was fabricated by casting the mixture of poly(dimethylsiloxane) (PDMS) and a magnetic powder material.
The beam type actuator works successfully and also shows interesting behavior. We can control the behavior of this actuator by changing the
arrangement of magnetic elements on the structure. We also show theoretical evaluation of the deformation of the present actuator..
70. Yang Xu, Fujio Tsumori, Hyun Goo Kang, Hideshi Miura, Study on Fabrication of Micrometer Patterned Ceramic Sheet with Micro Powder Imprinting (μPI) Method , Advanced Science Letters, 10.1166/asl.2012.2774, 12, 170-173, 2012.06, The ceramic thin sheet with micrometer scale 3D patterns may be used widely in the field of Micro Electro Mechanical Systems and we improved a new method of micro powder imprinting to fabricate the thin sheet with the powder of zirconia nanometer scale powder. The micrometer scale line and space patterns from 5 μm to 1 mm were imprinted on ceramic sheets at the binder's glassy state temperature with three kinds of mold in order to remove the mold from 400 μm ceramic sheets. In debinding and sintering steps, effects of parameters such as heating and cooling ratio, temperature of sintering on the final sample's mechanical properties such as the flatness of sheet, porosity and hardness will be investigated and discussed. Finally, we employed the 300 μm thick ceramic sheets with micro patterns fabricated by the μPI method for the electrolyte for solid oxide fuel cell. .
71. Effect of Mezzo-Heterogeneous Microstructure and Rolling on the Rolling Contact Fatigue Strength of Sintered High Ni Alloy Steels.
72. Wan Sharuzi Wan Harun, Kinji Toda, Toshiko Osada, Hyungoo Kang, Fujio Tsumori, Hideshi Miura, Effect of MIM Processing Parameters on the Properties of 440C Stainless Steel, 粉体および粉末冶金, 59, 5, 264-271, 2012.05.
73. Evaluation and Analysis of Distortion during MIM Process of Titanium Alloy Materials - 2nd Report -.
74. Improvement of Surface Densification and Fatigue Strength by Tooth Root Rolling of Sintered Ferrous Alloy Gear Added Mo.
75. Yang Xu, Fujio Tsumori, Hung-Goo Kang, Hideshi Miura, Fabricatino of Micro Patterned Ceramic Structure by Imprinting Process, Journal of the Japan Society of Powder and Powder Metallurgy, 58, 11, 673-678, 2011.11.
76. Fatigue Failure Properties of Injection Molded Superalloy Compacts.
77. Fabrication of Porous Structured WC-Co Alloy Compacts by Indirect Laser Forming.
78. Yang Xu, Fujio Tsumori, Takuya Toyooka, Hidetoshi Kotera and Hideshi Miura , Effects of Resist Thickness and Viscoelasticity on the Cavity Filling Capability in Bilayer Thermal Embossing, Japan Journal of Applied Physics, 10.1143/JJAP.50.06GK11 , 50, 06GK11, 2011.06.
79. Effect of Mezzo-Heterogeneous Microstructure and Rolling on the Tooth Root Bending Fatigue Properties of Sintered Ni Alloy Steel Gears.
80. Fatigue Properties of Ti Alloy Compacts by Metal Injection Molding - Part 1.
81. Fabrication of Super-Elastic Ti-10V-2Fe-3Al Alloy Compacts by MIM Process.
82. Hideshi MIURA, Kenta OKAWACHI, Hyun Goo KANG, Fujio TSUMORI, Kosaku KURATA and Nobuhiro ARIMOTO, Laser Forming of Ti-6Al-7Nb Alloy Powder Compacts for Medical Devices, Materials Science Forum, 654-656, 2057-2060, 2010.06.
83. Effect of Powder Type on the Polling Contact Fatigue Strength of 4600 Sintered Alloy Steels.
84. Improvement of the Contact Fatigue Strength by Rolling of Sintered Ferrous Alloy Rolle - 2nd Report-.
85. Development of High Precision and Strength Sintered Ferrous Alloy Gear by Rolling - 3nd Report -
Improvement of Tooth Root Bending Fatigue Strength of Sintered Ferrous Alloy Gear by Modified Tool
.
86. The Control Method of Porous Structure for density Gradient Materials in Direct Metal Laser Sintering (DMLS).
87. Naoki Miyano, Yuuki Inoue, Yuji Teramura, Fujio Tsumori, Hiroo Iwata and Hidetoshi Kotera, Gene transfer device utilizing micron-spiked electrodes produced by the self-organization phenomenon of Fe-alloy, Lab on a Chip, Vol. 8, pp. 1104-1109, 2008.01.
88. Fujio Tsumori, Micro Fabrication Process of Powder Compact with Semi-solid Mold, Materials Science Forum, Vol. 534-536, pp. 473-476., 2007.01.
89. Fujio Tsumori, Masamichi Hirata and Susumu Shima, Column Structure Growth Simulation of Magnetic Particles by Distinct Element Method Coupled with Magneto-FEM, Advances in Powder Metallurgy and Particulate Materials, Vol.1, pp. 74-84, 2005.01.
90. Fujio Tsumori and Susumu Shima, Isostatic Powder Compaction Process with Bingham Semi-solid/fluid Mold Material, Advances in Powder Metallurgy and Particulate Materials, Vol.1, pp. 157-169, 2005.01.
91. Fujio Tsumori, Hiroyuki Ogawa and Susumu Shima, On-demand Droplet Spotter for Formation of Micropattern Using Electrostatic Force, Advances in Powder Metallurgy and Particulate Materials, Vol.2, pp. 96-107, 2005.01.
92. Hidetoshi Kotera, Fujio Tsumori, Ikkou Iritani, Tomoharu Watanabe and Susumu Shima, Improving NdFeB Magnet Fabrication: In-Situ Observation of Powder Flow, International Journal of Powder Metallurgy, Vol. 40-1, pp33-40, 2004.01.
93. Fujio Tsumori, Hideki Kume, Atsushi Kakitsuji, Hiroki Miyamoto and Susumu Shima, Semi-solid Mold Isostatic Compaction, International Journal of Powder Metallurgy, Vol.39-8, pp46-51, 2003.01.
94. Tatsuhiko Aizawa, Yunan Prawoto, Fujio Tsumori, Coupled, macro-micro modeling for hot deformation and sintering, Journal of Computational and Applied Mathematics, Vol. 149-1, pp307-324, 2002.01.
95. Fujio Tsumori and Tatsuhiko Aizawa, Macro-micro Modeling for Coupled Elasto-creep and Thermal Analyses under Sintering, Materials Science and Engineering A, Vol 285, pp357-362, 2000.06.
96. Tatsuhiko Aizawa and Fujio Tsumori, Coupled-Multilevel Modeling for Hot Deformation and Sintering, Key Engineering Materials, Vol 177-180, pp661-666, 2000.01.