Kyushu University [Atsushi Takahara (Post-doctoral Fellow) Research Center for Negative Emissions Technologies, CO2 Capture Research Division]

Atsushi Takahara

Last modified date：2021.09.24

Post-doctoral Fellow / CO2 Capture Research Division / Research Center for Negative Emissions Technologies

Books

1.	, [URL].
2.	W. Ma, Y. Higaki, A. Takahara, Chapter 24 - Imogolite Polymer Nanocomposites, Developments in Clay Science, 7, 628-671 (2016), Elsevier, 2018.06.
3.	Atsushi Takahara, Yuji Higaki, Chapter 4：Design and Physicochemical Characterization of Novel Organic-Inorganic　Hybrids from Natural Aluminosilicate Nanotubes, Functional Polymer Composites with Nanoclays (Editors: Yuri Lvov, Baochun Guo, Rawil F Fakhrullin), RSC, 2016.11.
4.	Yoshifumi Amamoto, Hideyuki Otsuka, Atsushi Takahara(Kumar, Challa S. S. R. (ed.)), Synthesis and Characterization of Polymeric Nanogels(Nanomaterals for the Life Science (Volume 10)), Wiley-VCH , P27-57, 2011.02.
5.	H. Ostuka, A. Takahara, Structure and Properties of Imogolite Nanotubes and Their Application to Polymer Nanocomposites in Inorganic and Metallic Nanotubular Materials, Springer, 2010.05.
6.	, [URL].
7.	H. Otsuka, Y. Amamoto, Y. Matsuda, T. Maeda, A. Takahara, Synthesis and Reaction of Well-defined Copolymers with Thermally Exchangeable Dynamic Covalent Bonds in the Side Chains , American Chemical Society, ACS symposium Series Book: 1024(Controlled/Living Radical Polymerization: Progress in RAFT, DT, NMP & OMRP) , 2009.08.
8.	Motoyasu Kobayashi, Zhe Wang, Yasuhiro Matsuda, Masataka Kaido, Atsushi Suzuki, Atsushi Takahara(Sujeet K Sinha,Brian J Briscoe著), Polymer Tribology, Imperial College Press, CHAPTER18 TRIBOLOGICAL BEHABIOR OF POLYMER BRUSH PREPARED BY THE "GRAFTING-GROM" METHOD,582-602, 2009.03.
9.	T. Koga, A. Takahara, Scanning Force Microscopic Study of Surface Structure and Surface Properties of Organosilane Monolayers” , in "Modern Research and Educational Topics in Microscopy", Formatex, Vol.2, 471-482, 2007.12.
10.	Nozomi Inoue, Hidevuki Otsuka, Shin Lchiro Wada, Annaka Masahiko, Atsushi Takahara, Aggregation states and swelling/shrinking properties of (inorganic nanofiber/poly(N-isopropylacrylamide)) hybrid hydrogel, 55, 1020, 2006, Imogolite is a natural tubular aluminosilicate with an outer diameter of 2.5 nm and length of several micrometers. AI-OH groups at the outer surface of imogolite specifically interact with phosphoric groups. (Imogolite/poly(N- isopropylacrylamide)) hybrid hydrogel was prepared by the copolymerization of N-isopropylacrylamide and 2-methacryloyloxyethylphosphate, which is vinyl monomer with a phosphoric group, in the presence of imogolite without other cross-linking agent. The hybrid hydrogel was characterized by dynamic light scattering measurement and swelling and shrinking behaviors..
11.	Hiromichi Noma, Nozomi Inoue, Sono Sasaki, Ken Ichi Kato, Atsushi Takahara, Crystallization behavior of (poly (lactic acid)/imogolite nanofiber) composite, 55, 719, 2006, It is important to investigate the crystallization behavior of (biodegradable Polymer/nanofiller) composite because it ultimately governs mechanical, optical, thermal properties and biodegradability. In this study, the influence of inorganic nanofiber, "imogolite" on crystallization behaviors of poly(lactic acid) (PLA) was investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and polarized optical microscopy (POM). PLA/ octadecyl phosphonic acid (OPA) modified imogolite composite films were prepared by solution blending. The addition of imogolite modified with OPA resulted in the increase in crystal nucleation density..
12.	Yasushi Okamoto, Kazuo Kato, Takashi Aoki, Takao Izumi, Keiji Tanaka, Osami Sakata, Atsushi Takahara, Tisato Kajiyama, Effect of annealing treatment and surface treatment on adhesion behavior of poly(butylene terephthalate), 55, 1136, 2006, Influence of annealing treatment on adhesion behavior of poly(butylene terephthalate) (PBT) with epoxy adhesive was studied. The tensile adhesion strength decreased after the annealing treatment of PBT. In the case of the untreated PBT, the failure depth after the failure was not clearly defined. Once the PBT was annealed, the average failure depth turned to be 4 nm. The above results imply that the failure mechanism for the system transformed from interfacial failure to cohesive fracture upon annealing treatment. This can be easily understood by taking into account that a mechanically weak layer is formed in the surface region of PBT after the annealing. Such a weak boundary layer was observed by scanning viscoelasticity microscopy. Improvement of adhesive property was confirmed by surface treatment..
13.	Motoyasu Kobayashi, Wang Zhe, Kazuhiko Ishihara, Atsushi Takahara, Effect of grafting density of poly(2-methacryloyloxyethyl phosphorylcholine) brush on the tribological properties, 55, 1222, 2006, High-density polymer brush on silicon wafer was prepared by surface-initiated atom transfer radical polymerization ('grafting-from' method) of 2-methacryloyloxyethyl phosphorylcholine (MPC) using CuBr / 2,2'-bipyridyl complex in methanol at 300 K. Low-density poly(MPC) brush was prepared by 'grafting-to' method using an poly(MPC) end-functionalized with alkoxysilyl group. The surface of both poly(MPC) brush was very hydrophilic; water contact angle was below 5 degree. Dynamic friction tests were carried out by sliding a glass ball (φ = 10 mm) on the surface at a sliding velocity of 90 mm/min under loading of 0.49 N at 298 K. Friction coefficient of high-density poly(MPC) brush was much lower than that of low-density one in aqueous condition. In addition, great wear resistance was observed in a high-density polymer brush. These results indicate that high-density and super-hydrophilic polymer can act as efficient lubricant to reduce the friction coefficient..
14.	Koji Honda, Sono Sasaki, Osami Sakata, Masamichi Morita, Atsushi Takahara, Effect of molecular aggregation states and mobility of molecular chains on wetting properties of fluorinated polymer thin films, 55, 1277, 2006, The molecular aggregation states of poly(fluoroalkyl acrylate) [PFA-Cy, where y is the fluoromethylene number of the fluoroalkyl (R_f) groups] thin films were evaluated by in-plane and out-of-plane grazing-incidence X-ray diffraction (GIXD) measurements. It has been revealed that R_f chain of PFA-C_y with y≥8 was crystallized and formed ordered structures at the outermost surface. These results suggest that water repellent mechanism of PFA-C_y can be attributed to the presence of highly ordered R _f chains. Poly(fluoroalkyl methacrylate)s with short R_f groups [PFMA-C_y, y≤4] thin films were also characterized. The receding contact angle of PFMA-C_y were lager than PFA-C_y with y≤4. This result suggested that the mobility of molecular chains was restricted by α-methyl groups and the reorientation of short R_f chains hardly ware occurred..
15.	Koji Honda, Masamichi Morita, Sono Sasaki, Osami Sakata, Atsushi Takahara, Effect of surface molecular motion on wetting properties of poly (fluoroalkyl methacrylate) thin films, 55, 4253-4254, 2006, Effect of surface molecular motion on wetting properties of poly(fluoroalkyl methacrylate)s with short R_f groups [PFMA-C _y, where y is fluoromethylane number in R_f groups, y = 1,2,4] thin films were characterized by dynamic contact angle measurement, X-ray photoelectron spectroscopy (XPS), wide-angle X-ray diffraction, and lateral force microscopy (LFM). The receding contact angle of PFMA-C_y was lager than poly(fluoroalkyl acry late) with short R_f groups [PFA-C]. X-ray diffraction revealed that R_f groups were not crystallized. These results indicated that the thermal molecular motion of molecular chains were restricted by α-methyl groups and the reorientation of short R _f chains was hard to occur..
16.	Yasushi Okamoto, Kazuo Kato, Takashi Aoki, Takao Izumi, Keiji Tanaka, Atsushi Takahara, Tisato Kajiyama, Influence of plasma treatment on adhesion behavior of poly(butylene terephthalate), 55, 3442, 2006, An effect of surface treatment on adhesion behavior of poly (butylene terephthalate) (PBT) with epoxy adhesive was studied. In general, PBT is annealed at a temperature above the glass transition temperature to obtain dimensional stability for the practical use. However, such an annealing procedure makes the adhesion properties poorer. In this study, we demonstrate that tensile adhesive strength for annealed PBT could be improved through plasma treatment. Tensile adhesive strength increased with increasing surface density of C-O and COO groups, which were quantitatively detected by XPS. Finally, it was concluded that chemical interaction between carboxyl and/or ester groups of PBT and hydroxyl groups of epoxy adhesive was a responsible factor in improving adhesive strength between PBT and epoxy adhesive..
17.	Sono Sasaki, Hiroyasu Masunaga, Katsuaki Inoue, Osami Sakata, Hiroo Tajiri, Hiroshi Okuda, Hiromichi Noma, Kouji Honda, Atsushi Takahara, Masaki Takata, Investigation of molecular and lamellar aggregation structure of crystalline polymer thin films by synchrotron GIXD and GISAXS measurements, 55, 4314-4315, 2006, In this stuay, molecular and meso-scale structures sucn as molecular/Tamellar orientation ana lamellar stacking distance were investigated for HDPE thin films by synchrotron 2D-grazing-incidence wide-angle X-ray diffraction/small-angle X-ray scattering (SR-2D-GIXD/GISAXS) simultaneous measurements. A sample used in this study was additive free high-density polyethylene (HDPE). HDPE films with a thickness of ca. 400 nm were prepared onto Si wafers by a dip-coating method. The obtained films on the wafers were isothermally crystallized at a crystallization temperature of 373K from the melt. Afterward, some of the obtained films were treated at an annealing temperature (Ta) of 378K, 383K or 388K for 24 hours or annealed at each Ta in a stepwise heating from ca. 300K. In-situ and ex-situ measurements of 2D-GIXD/GISAXS for melt-crystallized and annealed films were carried out with imaging-plates at the BL40B2 beamline of SPring-8. The wavelength of incident X-rays was 0.15 nm and camera length was ca. 110 mm for GIXD and ca. 2180 mm for GISAXS. On the basis of 2D-GIXD patterns for HDPE thin films during a stepwise annealing, it was implied that the a axis of orthorhombic unit cell relatively oriented in the out-of-plane direction. Strong scatterings near Yoneda peak in the in-plane direction of 2D-GISAXSpatterns were detected for the films. The peak position of the scattering corresponds to the long period, the average distance between stacked crystalline lamellae. By annealing the film, the peak position of the scattering shifted to the lower q_y range in the in-plane direction. These results indicated that crystalline lamellae were stacked in the parallel direction to the film surface and the long period became longer from ca. 25 nm to ca. 35 nm by annealing. In a lamella, chains were regularly packed and the chain axis (the c axis) was relatively oriented parallel to the film surface..
18.	Masaya Hikita, Tetsuya Nakamura, Keiji Tanaka, Tisato Kajiyama, Atsushi Takahara, Liquid repellent properties of patterned surfaces and their applications to polymeric materials, 55, 1264, 2006, It was studied how liquid repellent properties can be controlled on the basis of roughness at surfaces. Ultrafine-patterned surfaces were prepared by the photolithography. The surfaces were fully covered with fluoroalkyl silane coupling agent by chemical vapor deposition (CVD) for about two hours. Contact angle to water increased as increasing pitch of the pattern. The relation between water contact angle and pitch was well expressed by the Cassie mode, where assumed that the space between solid surface and water was occupied by air. Contact angle to dodecane was neither in agreement with Wenzel nor Cassie's modes. Instead, in the case of dodecane, both modes should be combined to reproduce the experimental results. Hence, it can be claimed that factors such as increase in surface area and formation of air layer at the interface between liquid and surface are important for excellent liquid repellent properties..
19.	Kyota Miyamoto, Nao Hosaka, Motoyasu Kobayashi, Hideyuki Otsuka, Naoya Torikai, Atsushi Takahara, Molecular aggregation states of silsesquioxane-terminated polystyrene in polystyrene thin film, 55, 1228, 2006, Organic-inorganic hybrid polymers (PS-POSS), which were polystyrene (PS) with polyhedral oligomeric silsesquioxane (POSS) end group, were prepared by nitroxide-mediated radical polymerization. Blend films composed of PS-POSS and PS were spin-coated from their toluene solution onto cleaned silicon wafer. The dispersibility of POSS in PS thin films was improved by the introduction of POSS as the chain end groups of PS. The addition of PS-POSS to PS thin film can stabilize the film against dewetting. Neutron reflectivity measurements revealed that PS-POSS formed enriched layer at the surface and interface of the film. The segregation of the PS-POSS, which changes the surface and interface free energy of the film, can be an important factor in the dewetting inhibition effect..
20.	A. Takahara, Molecular Assembly of Organosilanes "in the Encyclopedia of Nanoscience and Nanotechnology Dekker, NY" , 2031-2042 , 2004.01.
21.	M. Fujihira, S. Itoh, A. Takahara, O. Karthaus, S. Okazaki, K. Kajikawam, Nano-Optics, Springer, "7 Near-Field Imaging of Molecules and Thin Films",Kawata, S.; Ohtsu, M.; Irie, M. (Eds.),152-190, 2002.01.
22.	A. Takahara, K. Tanaka, S.-R. Ge, T. Kajiyama, Scanning Force Microscopic Study of Surface Morphology and Surface Mechanical Properties of Polymeric Solidsin Surface Science of Crystalline Polymers, Kodansha Scientific, M. Terano and N. Yui Eds.,1-16, 1996.01.
23.	Atsushi Takahara, "Modern Approaches to Wettability: Theory and Applications", Plenum Press, "Block Copolymers and Hydrophilicity", M. E. Schrader and G. Loeb Eds,p.179, 1992.01.

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