| Junya Suehiro | Last modified date：2024.04.25 |
Professor /
Applied Energy Engineering
Department of Electrical Engineering
Faculty of Information Science and Electrical Engineering
Department of Electrical Engineering
Faculty of Information Science and Electrical Engineering
Graduate School
Undergraduate School
Other Organization
Administration Post
Other
Homepage
https://kyushu-u.elsevierpure.com/en/persons/junya-suehiro
Reseacher Profiling Tool Kyushu University Pure
http://hv.ees.kyushu-u.ac.jp/Lab-e/index.html
Introduction of laboratory .
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Bio MEMS, Nanotechnology, Applied Electrostatics, High Voltage Engineering
ORCID(Open Researcher and Contributor ID)
https://orcid.org/0000-0003-2049-4020
Total Priod of education and research career in the foreign country
01years00months
Outline Activities
Despite the long history, electrostatics is still challenging and exciting research subjects. Thus far, applications of electrostatics have been found in various technologies including high voltage apparatus, ink jet printer, xerography, electrostatic precipitator, exhaust gas treatment and so on. Recently, electrokinetic phenomena such as electrophoresis and dielectrophoresis have found useful applications in biotechnology and nanotechnology. Besides benefits from the industrial applications, electrostatics still provides new insights about fundamental relationship between substance and electrical charges.
In our lab, we are involved in research subjects based on applied electrostatics for the cross-disciplinary area such as bio and nanotechnology. Especially, we currently focus on electrokinetic manipulation of micro and nano-scaled materials and its application for fabrication of Bio-MEMS devices and chemical sensors.
We are always looking for an opportunity to collaborate with outstanding researchers and ambitious young students, who want to share the same academic interests and passion for science.
In our lab, we are involved in research subjects based on applied electrostatics for the cross-disciplinary area such as bio and nanotechnology. Especially, we currently focus on electrokinetic manipulation of micro and nano-scaled materials and its application for fabrication of Bio-MEMS devices and chemical sensors.
We are always looking for an opportunity to collaborate with outstanding researchers and ambitious young students, who want to share the same academic interests and passion for science.
Research
Research Interests
- Fabrication of large-sized nanocomposite material using carbon nanotubes oriented by electric field
keyword : nanocomposite, carbon nanotubes orientation, electric field
2010.04. - Functionalization of nanomaterials using pulsed power and microplasma
keyword : Microplasma, Pulsed power, Water-soluble carbon nanotube
2003.01～2010.12Since their discovery in 1991, carbon nanotubes (CNTs) have been regarded as a promising new material because of their unique electrical, mechanical and chemical properties. However, the poor solubility of CNTs in water or organic solvents limits their use in many potential applications, especially in biochemical science and engineering. Thus far, several approaches have been attempted to solubilize CNTs, such as covalent or non-covalent functionalization, chemical oxidation, addition of surfactants, polymer wrapping. Although these methods have been successful, they need some particular chemical agents or additives for solubilization. There still exists a need for a simpler solubilization procedure for CNTs. We developed a novel preparation method for water-soluble CNTs using microplasma generated in water suspension of CNTs. The microplasma was achieved by generating pulsed streamer discharges, which were triggered by applying multiple square high voltage pulses to an electrode system immersed in the CNT suspension. The CNTs treated by the pulsed streamer discharge were solubilized and were homogeneously dispersed in water for a long time. The functional group of –OH bound to the CNT surface seemed to be responsible for the solubilization effect. The –OH group might be formed by chemical reactions between O∗ and H∗ radicals, which were produced by microplasma. The proposed method does not need any particular chemical agents or additives for solubilization. Of particular importance is its simplicity and time-efficiency in contrast to the usual time-consuming chemical treatments developed thus far.. - Fabrication of nanomaterial-based sensor using dielectrophoresis
keyword : dielectrophoresis, gas sensor, carbon nanotube, ZnO nanowire, Photo sensor
2003.01Interest in nanomaterials has been growing rapidly for the past several years. For example, carbon nanotubes (CNTs) are promising as new materials for a variety of potential applications. Recently, CNT-based gas sensors have received considerable attention because of their outstanding properties, such as faster response, higher sensitivity, lower operating temperature and wider variety of gases that may be detected compared with the other types of gas sensors. The CNT-based gas sensing utilizes a change in an electrical property due to adsorption of gas molecules as the output signal. This means that CNTs need to be electrically connected to the external measuring circuit. We developed a novel method of fabricating a CNT-based gas sensor using dielectrophoresis (DEP). The DEP fabricated CNT sensor can detect low concentration (ppm level) toxic gases such as NO2 and NH3 at room temperature. One advantage of the ac electrokinetic manipulation technique is that one can quantify the amount of trapped CNTs on a real time basis by monitoring electrical impedance of the sensor (dielectrophoretic impedance measurement, DEPIM). This feature enables to control the CNT sensor response. The other advantage is that various combinations of nanomaterials and the microelectrode materials can be realized because two processes of the nanomaterial synthesis and the sensor fabrication are separated. The DEP fabrication method has been successfully applied to the other type of nanomaterials, such as carbon nanohorn, ZnO nanowire and palladium (Pd) nanoparticles. By DEP trapping CNTs on aluminum (Al) microelecrode, Schottky-type NO2 gas sensor with faster response can be fabricated.. - Manipulation and detection of bacteria using dielectrophoresis
keyword : Dielectrophoresis, MEMS, Bacteria sensor, μ-TAS
1990.01Dielectrophoresis (DEP) is the electrokinetic motion of dielectrically polarized particles in divergent electric fields and is currently an active area of research in several laboratories. As most biological cells and macro-molecules behave as dielectric particles in external alternating current (ac) electric fields, DEP has found many useful biotechnological applications including separation, positioning and characterization of biological particles. We developed a new detection technique of biological cells called dielectrophoretic impedance measurement (DEPIM) based on dielectrophoresis. The DEPIM utilizes the positive dielectrophoresis, which attracts polarized particles to the high field region, in order to capture biological cells onto an interdigitated electrode chip in the form of pearl-chains. Higher cell population results in faster formation of the pearl-chains, which bridge over the electrode gap and hence increase the admittance between the electrodes. By monitoring the temporal variation of the electrode impedance or admittance, the cell population can be quantitatively evaluated. DEPIM can realize fast and simple bacteria inspection by using only electrical phenomena and instruments. The DEPIM can also realize selective detection of biological cells according to their viability or species. It has been also demonstrated that DEPIM sensitivity for yeast (Saccharomyces cerevisiae) detection could be considerably improved by electro-permeabilization or electroporation (EP) under high ac electric field. In the EP-assisted DEPIM (EPA-DEPIM), the electrode conductance abruptly increased in a transient manner due to intracellular ion release from the perforated cells. EPA-DEPIM could quantitatively detect yeast cells in 15 min and E. coli in 3 hours at 102 CFU/ml concentration.. - Diagnosis of gas insulated switch gear using carbon nanotube gas sensor
keyword : Carbon nanotube gas sensor, Gas-insulated switchgear (GIS), SF6
2003.03Gas-insulated switchgear (GIS), which is filled with pressurized SF6 gas for electrical insulation as well as for arc extinction, is widely used in electric power system in recent decades due to the compact size and high reliability. Despite the high reliability, insulation fault may still occur in the long lifetime of GIS (typically a few tens of years). So it is important to predict and avoid potential insulation fault in GIS. Partial discharge (PD) detection is an effective method to assess the insulation condition of GIS. To date, several PD detection methods have been proposed and investigated, such as an ultra-high frequency electro-magnetic field sensor, an acoustic emission sensor, an optical emission sensor and a chemical byproducts analysis. One advantage of the chemical byproducts analysis is that it is not affected by electromagnetic background noises. It is well known that SF6 will undergo some decomposition under discharge and overheating. SF4, SOF2, SO2, SOF4, SO2F2, F2 and HF are generated as a result of SF6 decomposition and the reactions with contaminants such as water vapor and oxygen. These chemical byproducts can be an indicator of PD and detected by various methods including a gas detection tube, a gas chromatography and FTIR. Recently, carbon nanotube (CNT) gas sensors have received considerable attention because of their outstanding properties, such as quicker response, higher sensitivity, lower operating temperature and wider variety of gases that may be detected compared with the other types of gas sensors. We proposed a new detection method of PD occurring in SF6 using a carbon nanotube (CNT) gas sensor, which was fabricated by a new method based on electrokinetic manipulation of CNTs under positive dielectrophoresis (DEP), which trapped CNTs onto the microelectrode. When PD was generated in SF6, the electrical conductance of gas sensor gradually increased. FTIR analysis and molecular orbital calculations revealed that major decomposition products, which were responsible for the CNT sensor response were SF4 and SOF2..
Papers
| 1. | Shota Nakahara, Takahiro Morita, Haruka Omachi, Masafumi Inaba, Michihiko Nakano, Junya Suehiro, Comparison between modulations of contact and channel potential in nitrogen dioxide gas response of ambipolar carbon nanotube field-effect transistors, AIP Advances, 10.1063/5.0124891, 12, 12, 125302-1-125302-6, 2022.12, Carbon nanotubes (CNTs) are promising materials for gas sensing because of their large specific area and high sensitivity to charge differentiation. In CNT-based field-effect transistors (FETs) for gas sensing, both CNT potential modulation in the channels and Schottky barrier height modulation at the CNT/metal electrode contact influence the current properties. However, researchers have not used Schottky barrier height modulation for gas detection. To investigate and compare the effects of Schottky barrier height modulation and CNT channel potential modulation on NO2 gas exposure, we fabricated ambipolar CNT FETs by the dielectrophoretic assembly. We exposed CNT FET gas sensors to N2 gas containing 100-ppb NO2 and observed two different responses in the electric properties: a steady current shift in the positive direction in the hole-conduction region because of the channel potential modulation, and an abrupt decrease in transconductance in the electron-conduction region because of the Schottky barrier modulation. The CNT channels and CNT/metal contact both contributed to the sensor response, and the modulation rate of the Schottky barrier was higher than that of the CNT potential shift in the channel.. |
| 2. | Hao Chen, Tsubasa Yamakawa, Masafumi Inaba, Michihiko Nakano, Junya Suehiro, Characterization of Extra-Cellular Vesicle Dielectrophoresis and Estimation of Its Electric Properties, Sensors, 10.3390/s22093279, ２２, 9, 3279, 2022.04. |
| 3. | M. Inaba, T. Oda, M. Kono, N. Phansiri, T. Morita, S. Nakahara, M. Nakano, J. Suehiro, Effect of mixing ratio on NO2 gas sensor response with SnO2-decorated carbon nanotube channels fabricated by one-step dielectrophoretic assembly, Sensors and Actuators, B: Chemical, 10.1016/j.snb.2021.130257, 344, 130257-1-130257-9, 2021.10, We fabricated nitrogen dioxide (NO2) gas sensors with p-type carbon nanotubes (CNTs) / n-type tin dioxide (SnO2) nanoparticle heterojunctions using one-step dielectrophoretic assembly and investigated the effect of CNT/SnO2 ratio on their NO2 gas detection properties. CNTs and SnO2 nanoparticles were mixed in various ratios, suspended in deionized water, and assembled by dielectrophoresis. The normalized response of fabricated CNT/SnO2 heterojunction gas sensors against 1 ppm NO2 was ∼80 in an N2 atmosphere and ∼20 in artificial air, where UV irradiation was used only for initialization. To reduce the effect of oxygen (O2), we also conducted continuous UV irradiation with various intensities during the initialization and gas detection. The CNT/SnO2 pn heterojunction gas sensor had a maximum normalized response of 19 for 1 ppm NO2 in artificial air, while that of the SnO2 sensor was 3. Furthermore, plotting the gas sensor response as a function of NO2 concentration reveals that the sensor detected an NO2 gas concentration as low as 20 ppb in artificial air. . |
| 4. | R. Nakane, H. Kojima, J. Suehiro, H. Okubo, N. Hayakawa, Time Transition of Conductivity Distribution in Air by DC Partial Discharge for Air-solid Composite Insulation Systems, 2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 10.1109/CEIDP49254.2020.9437492, 55-58, 2020.10. |
| 5. | Zhenhao Ding, Michihiko Nakano, Junya Suehiro, DNA detection method based on the microbead velocity under traveling wave dielectrophoresis, Proceedings of the 12th International Joint Conference on Biomedical Engineering Systems and Technologies, 10.5220/0007341800210025, 1, 21-25, 2019.02. |
| 6. | Michihiko Nakano, Zhenhao Ding, Junya Suehiro, Frequency-dependent conductance change of dielectrhophoretic-trapped DNA-labeled microbeads and its application in DNA size determinations, Microfluidics and Nanofluidics, 10.1007/s10404-018-2051-7, 22, 26, 2018.03. |
| 7. | M. Nakano, Z. Ding, J. Suehiro, Frequency-dependent conductance change of dielectrhophoretic-trapped DNA-labeled microbeads and its application in DNA size determinations, Microfluidics and Nanofluidics, 10.1007/s10404-018-2051-7, 22, 26, 2018.03. |
| 8. | Michihiko Nakano, Zhenhao Ding, Junya Suehiro, Comparison of Sensitivity and Quantitation between Microbead Dielectrophoresis-Based DNA Detection and Real-Time PCR, Biosensors, 10.3390/bios7040044, 7, 4, 44, 2017.09. |
| 9. | Michihiko Nakano, Zhenhao Ding, Junya Suehiro, Comparison of Sensitivity and Quantitation between Microbead Dielectrophoresis-Based DNA Detection and Real-Time PCR, Biosensors, 10.3390/bios7040044, 7, 4, 44, 2017.09. |
| 10. | Zhenhao Ding, Hiromichi Kasahara, Michihiko Nakano, Junya Suehiro, Bacterial detection based on polymerase chain reaction and microbead dielectrophoresis characteristics, IET NANOBIOTECHNOLOGY, 10.1049/iet-nbt.2016.0186, 11, 5, 562-567, 2017.08. |
| 11. | Yoshihiko Obana, Michihiko Nakano, Junya Suehiro, Breakup of carbon nanotube aggregates under high electric field and its application to nanocomposite film, IEEE TENCON 2016, 10.1109/TENCON.2016.7848606, 3045-3048, 2017.02. |
| 12. | Hiroki Hayashi, Michihiko Nakano, Junya Suehiro, Detection of acetylene dissolved in insulation oil using pt-decorated ZnO gas sensor, IEEE TENCON 2016, DOI: 10.1109/TENCON.2016.7848262, 1485-1488, 2017.02. |
| 13. | Shota Inoue, Michihiko Nakano, Junya Suehiro, Dielectrophoretic modification of carbon nanotube with ZnO nanoparticles for NO2 gas sensing, IEEE TENCON 2016, 10.1109/TENCON.2016.7848608, 3054-3057, 2017.02. |
| 14. | Zhenhao Ding, Hiromichi Kasahara, Michihiko Nakano, Junya Suehiro, Bacterial detection based on polymerase chain reaction and microbead dielectrophoresis characteristics, IET Nanobiotechnology, 10.1049/iet-nbt.2016.0186, 2016.11. |
| 15. | Yuki Inoue, Ryoji Obara, Michihiko Nakano, Junya Suehiro, Concentration of bacteria in high conductive medium using negative dielectrophoresis, 2015 IEEE International Conference on Industrial Technology, ICIT 2015, 10.1109/ICIT.2015.7125592, 2015-June, June, 16 June 2015, 3336-3340, Article number 7125592, 2015.06, Rapid and sensitive detection of pathogenic bacteria has been an important concern in various fields such as bioscience research, medical diagnosis and hazard analysis in the food industry. The requirement for highly efficient bacterial detection has pointed to the need for new and innovative sample concentration technologies. In this study, a new microfluidic device was demonstrated to enable concentration of bacteria by using negative dielectrophoresis (n-DEP) in high conductive medium. A special design of the electrode system, which was covered with patterned dielectric films, was tested in order to control the electric field distribution in the device so that n-DEP force could drive cells to a point for concentration as well as Joule heating of the suspension medium could be suppressed to avoid heat-induced cell damage. The electrode design was optimized using numerical calculation results of cell motion trajectories and the suspension medium temperature in the device. It was experimentally proved that proposed microfluidic device could concentrate E. coli cells in a continuous flow of cell suspension.. |
| 16. | Hiromichi Kasahara, Zhenhao Ding, Michihiko Nakano, Junya Suehiro, Effect of DNA length on dielectrophoretic characteristics of DNA-labeled microbeads, 2015 IEEE International Conference on Industrial Technology, ICIT 2015, 10.1109/ICIT.2015.7125593, 2015-June, June, 16 June 2015, 3341-3346, Article number 7125593, 2015.06, Polymerase chain reaction (PCR) is a powerful tool for diagnostic procedures in bacterial and viral infections. We have developed a new electrical technique for rapid detection of DNA amplified by PCR using dielectrophoresis (DEP) of microbeads that are chemically labeled with the amplicons. The DNA immobilization on the microbeads alters their DEP behavior in such a way that they are trapped on a microelectrode under the action of positive DEP, whereas pristine microbeads are not. Combining the dramatic alteration in DEP characteristics with impedance measurement leads to rapid and quantitative detection of amplicons. The method is based on the surface conductivity dependence of microbeads DEP characteristics. It was expected that the surface conductivity would depend on the length of DNA fragments immobilized on a microbeads. In this study, it was found that the crossover frequency was dependent on the length of DNA.. |
| 17. | Yuki Kawabe, Li Li, Michihiko Nakano, Suehiro Junya, Dielectrophoretic fabrication and chacterization of ZnO nanowire-based acetylene gas sensor, 2015 IEEE International Conference on Industrial Technology, ICIT 2015, 10.1109/ICIT.2015.7125298, 2015-June, June, 16 June 2015, 1433-1437, Article number 7125298, 2015.06, Wide-gap semiconductors with nanostructures such as nanoparticles, nanorods, nanowires are promising as a new type of gas sensor. Recently, ZnO (zinc oxide) nano-structures have been extensively investigated for acetylene (C2H2) gas sensing device applications. In this paper, a new fabrication method of a C2H2 gas sensor based on ZnO nanowires using dielectrophoresis is demonstrated. Dielectrophoresis (DEP) is the electrokinetic motion of dielectrically polarized materials in nonuniform electric fields. ZnO nanowires were trapped in the microelectrode gap where the electric field became higher. The trapped ZnO nanowires were aligned along the electric field line and bridged the electrode gap. Upon exposure to C2H2 gas, the conductance of the DEP-trapped ZnO nanowires increased. The ZnO nanowire gas sensor response to C2H2 gas was dependent on the temperature and the maximum response was obtained at 250 °C. It was confirmed that the sensor response was considerably improved by electrochemically decorating the ZnO nanowires with platinum nanoparticles.. |
| 18. | Zhenhao Ding, Hiromichi Kasahara, Michihiko Nakano, Junya Suehiro, Dielectrophoretic characteristics of microbeads labeled with DNA of various lengths, 8th International Conference on Biomedical Electronics and Devices, BIODEVICES 2015, 185-89, 2015.01, Polymerase chain reaction (PCR) is one of the most sensitive and specific detection methods of bacterial and viral infections. The authors proposed a new electrical technique for rapid detection of DNA amplified by PCR using dielectrophoresis (DEP) of microbeads. The method is based on dramatic alteration of DEP characteristics of microbeads caused by DNA labelling. DNA labeled microbeads are trapped on a microelectrode under the action of positive DEP, whereas pristine microbeads are not. DEP-trapped microbeads can be measured impedimetrically to realize rapid and quantitative detection of the amplified DNA. In this study, it was aimed to reveal how DNA length affects DEP characteristic of DNA-labeled microbeads. Dielectrophoretic crossover from the negative to the positive was measured for microbeads labeled with DNA length in 204 bp, 391 bp and 796 bp. After theoretical fitting of DEP crossover data, it was revealed that the surface conductance increased when the length of labeled DNA increased.. |
| 19. | Michihiko Nakano, Ding Zhenhao, Hiromichi Kasahara, Junya Suehiro, DNA Detection using Microbeads-based Dielectrophoretic Impedance Measurement, Proceedings of the International Conference on Sensing Technology, ICST, 10.1109/ICSENS.2014.6985174, 2014-December, December, 12 December 2014, 1010-1013, Article number 6985174, 2014.12, A new electrical technique for rapid detection of DNA amplified by polymerase chain reaction (PCR) using dielectrophoresis (DEP) of microbeads was demonstrated. The amplicons were chemically immobilized on the microbeads. The DNA immobilization on the microbeads alters their DEP behavior in such a way that they are trapped on a microelectrode under the action of positive DEP, whereas pristine microbeads are not. Combining the dramatic alteration in DEP characteristics with impedance measurement leads to rapid and quantitative detection of the amplicon in a few seconds. The proposed microbead-based assay could be applicable for rapid, quantitative, and automated detection of virus infection.. |
| 20. | Michihiko Nakano, Zhenhao Ding, Hiromichi Kasahara, Junya Suehiro, Rapid microbead-based DNA detection using dielectrophoresis and impedance measurement, EPL, 10.1209/0295-5075/108/28003, １０８, 2, Article number 28003 (5 pages), 2014.10, Polymerase chain reaction (PCR) is a powerful tool for diagnostic procedures in bacterial and viral infections. The authors propose a new electrical technique for rapid detection of DNA amplified by PCR using dielectrophoresis (DEP) of microbeads. The method is based on dramatic alteration of DEP characteristics of microbeads caused by DNA labeling. DNA-labeled microbeads are trapped on a microelectrode under the action of positive DEP, whereas pristine ones are not. DEP-trapped microbeads are measured impedimetrically to realize rapid and quantitative detection of the amplified DNA. The validity of the proposed method was demonstrated by detection of PCR-amplified DNA of viruses.. |
| 21. | Michihiko Nakano, Ryoji Obara, Ding Zhenhao, Junya Suehiro, Detection of norovirus and rotavirus by dielectrophoretic impedance measurement, Proceedings of the International Conference on Sensing Technology, ICST, 374-378, Article number 6727678, 2013.12. |
| 22. | Ryoji Obara, Ding Zhenhao, Kenta Shinzato, Michihiko Nakano, Junya Suehiro, Higher throughput of optical detection of bacteria concentrated by negative dielectrophoresis, Proceedings of the International Conference on Sensing Technology, ICST, 275-278, Article number 6727658, 2013.12. |
| 23. | Hamada Ryo, Takayama Hiroyuki, Shonishi Yasuhiko, Mao Leina, Suehiro Junya, A rapid bacteria detection technique utilizing impedance measurement combined with positive and negative dielectrophoresis, Sensors and Actuators, B: Chemical, 10.1016/j.snb.2013.02.030, 181, 439-445, 2013.05, In this study, a bacterial detection technique and device that utilizes advantages of both positive and negative dielectrophoresis (DEP) has been proposed and demonstrated. The device has two microelectrodes, which serve as a bacteria concentrator using negative DEP (n-DEP) and as a bacteria detector using positive DEP (p-DEP), respectively. Bacteria flowing into the device are repelled under action of n-DEP force exerted by the first microelectrode, and are pushed toward the second microelectrode situated at the downstream. Then concentrated bacteria are finally captured by p-DEP on the second microelectrode and detected by dielectrophoretic impedance measurement (DEPIM) method. The numerical simulations and experiments proved that n-DEP concentrator could make DEPIM sensitivity two times higher than that without n-DEP as a result of increased number of bacteria trapped on the p-DEP microelectrode.. |
| 24. | Nakano Michihiko, Hisajima Takafumi, Mao Leina, Suehiro Junya, Electrical detection of norovirus capsid using dielectrophoretic impedance measurement method, Proceedings of IEEE Sensors, 10.1109/ICSENS.2012.6411163, 2012.10, In this work, we demonstrated an electrical detection technique of norovirus capsid in liquid by using dielectrophoretic impedance measurement (DEPIM). DEPIM is a method composing of capturing target particles by dielectrophoresis (DEP) in the gap of microelectrodes and measuring the impedance change of the microelectrodes caused by the captured particles. DEPIM has been successfully applied to bacteria detection by the present authors. This is the first report to extend scope of DEPIM inspection from bacteria to norovirus. Recombinant norovirus capsid was employed as target particles in experiments due to safety concerns. First, we showed virus capturing by DEP using fluorescent labeled norovirus capsid. Then, DEPIM of the capsid was carried out. As the result, DEPIM detected 2.5 ng/ml of the norovirus capsid in 300 sec. This implies that DEPIM has comparable sensitivity but shorter detection time than immunochromatography. . |
| 25. | M. Nakano, R. Hamada, H. Takayama, Y. Shonishi, T. Hisajima, L. Mao, J. Suehiro, Pretreatment of cell membranes for improved electropermeabilization-assisted dielectrophoretic impedance measurement, Sensors and Actuators B: Chemical, , 10.1016/j.snb.2012.07.078, 2012.08, [URL], We improved our previously reported highly sensitive bacteria detection method called electropermeabilization-assisted dielectrophoretic impedance measurement (EPA-DEPIM), which counts the number of bacteria by measuring changes in impedance. EPA-DEPIM involves two processes: collection of bacteria by dielectrophoresis (DEP), followed by electropermeabilization (EP) of the cell membranes. In DEP, bacterial cells in aqueous solution are collected on microelectrodes by the dielectrophoretic force. In EP, a pulse-like rectangular wave is applied to the collected cells to disrupt their membranes. This increases the signal sensitivity because the disrupted membranes release intracellular ions that increase the change in impedance. However, the pulse-like EP wave creates a strong electric field that causes metal ions to be released from the microelectrodes, increasing the blank signal to levels comparable to that for a low-concentration Escherichia coli suspension (102 cells/ml). To address this problem, we demonstrated the efficacy of two types of pretreatment applied before the EP wave: chemical pretreatment by exposure to hydrogen peroxide, and physical pretreatment by a small pulse-like voltage. Both pretreatments successfully intensified the change in impedance even at a lower EP voltage.. |
| 26. | Y. Martin, Z. Li, T. Tsutsumi, R. Shou, M. Nakano, J. Suehiro and S. Ohtsuka, Detection of SF6 decomposition products generated by DC corona discharge using a carbon nanotube gas sensor, IEEE Transactions on Dielectrics and Electrical Insulation, 10.1109/TDEI.2012.6180262, 19, 2, 671-676, 2012.04. |
| 27. | M. Nakano, M. Fujioka, K. Mai, H. Watanabe, Y. Martin and J. Suehiro, Dielectrophoretic Assembly of Semiconducting Carbon Nanotubes Separated and Enriched by Spin Column Chromatography and Its Application to Gas Sensing, Jpn. J. Appl. Phys., 10.1143/JJAP.51.045102, 51, 045102 (6 pages), 2012.03, [URL]. |
| 28. | R. Hamada, H. Takayama, Y. Shonishi, T. Hisajima, L. Mao, M. Nakano and J. Suehiro, Improvement of dielectrophoretic impedance measurement method by bacterial concentration utilizing negative dielectrophoresis, Journal of Physics: Conference Series, 307, 1, Art. no. 012031, 2011.12. |
| 29. | W. Sun, H. Tomita, S. Hasegawa, Y. Kitamura, M. Nakano and J. Suehiro, An array of interdigitated parallel wire electrodes for preparing a large-scale nanocomposite film with aligned carbon nanotubes, J. Phys. D: Appl. Phys., 44, 9, Article number 445303, 2011.11. |
| 30. | R. Hamada, J. Suehiro, M. Nakano, T. Kikutani, K. Konishi, Development of rapid oral bacteria detection apparatus based on dielectrophoretic impedance measurement method, IET Nanobiotechnology, 10.1049/iet-nbt.2010.0011, 5, 2, 25-31, 2011.06, [URL], In this study, a bacteria detection apparatus based on dielectrophoretic impedance measurement (DEPIM) method was demonstrated for rapid evaluation of oral hygiene. The authors integrated a micro electrode chip on which bacteria were captured by dielectrophoresis (DEP), an AC voltage source to induce DEP force, and an impedance measurement circuit to a portable instrument that enables rapid and automated oral bacterial inspection in hospitals and clinics. Special considerations have been made on effects of high electrical conductivity of oral samples on DEP force and DEPIM results. It was shown experimentally and theoretically that using a higher electric field frequency for the DEP bacteria trap and the impedance measurement could realise DEPIM application to bacteria inspection from oral samples with higher conductivity. Based on these investigations, the authors optimised the frequency condition of the DEPIM suitable for inspecting an oral sample along with the design and development of a portable DEPIM apparatus for on-site inspection of oral bacteria. Under the optimised frequency condition, DEPIM results were in good agreement with the conventional culture method showing significant applicability of the DEPIM apparatus for practical rapid oral bacteria inspection.. |
| 31. | R. Hamada and J. Suehiro, Optimization of electric field frequency on dielectrophoretic impedance measurement method for oral bacteria detection, Proceedings of the International Conference on Biomedical Electronics and Devices (Biodevices 2011), 125-129, 2011.01. |
| 32. | K. Imasaka, W. Sun, H. Tomita, Y. Kato, U. Khaled and J. Suehiro, Enhancement and stabilization of pulsed streamer discharge in water by adding carbon nanotubes, Jpn. J. Appl. Phys., 10.1143/JJAP.49.086203, 49, 086203, 2010.08, [URL]. |
| 33. | J. Suehiro, Fabrication and characterization of nanomaterial-based sensors using dielectrophoresis, Biomicrofluidics, 10.1063/1.3430535, 4, 3430535, 2010.06, [URL], Dielectrophoresis DEP is an electrokinetic motion of dielectrically polarized materials in nonuniform electric fields. DEP has been successfully applied to manipulation of nanomaterials including carbon nanotubes CNTs, metallic nanoparticles, and semiconducting nanowires. Under positive DEP force, which attracts nano materials toward the higher field region, nanomaterials are trapped in the electrode gap and automatically establish good electrical connections between them and the external measuring circuit. This feature allows us a fast, simple, and low-cost fabrication of nanomaterial-based sensors based on a bottom-up approach. This paper first presents a theoretical background of DEP phenomena and then reviews recent works of the present author, which were aimed to develop nanomaterial-based sensors, such as a CNT gas sensor and a ZnO nanowire photosensor, using DEP fabrication technique. It is also demonstrated that DEP technique enables self-formation of interfaces between various nano materials, which can be also applicable as novel sensing transducers.. |
| 34. | W. Sun, U. Khaled, H. Tomita, Z. Li, K. Imasaka and J. Suehiro, Solubilization of single-walled carbon nanotubes using ozone generated by dielectric barrier discharge, Jpn. J. Appl. Phys., 10.1143/JJAP.49.055002, 49, article No. 055002, 2010.05, [URL]. |
| 35. | W. Sun, U. Khaled, H. Tomita, Z. Li, K. Imasaka and J. Suehiro, Solubilization of single-walled carbon nanotubes using ozone generated by dielectric barrier discharge, Jpn. J. Appl. Phys., 10.1143/JJAP.49.055002, 49, 055002, 2010.05, [URL]. |
| 36. | W. Sun, U. Khaled, H. Tomita, Z. Li, K. Imasaka and J. Suehiro, Solubilization of single-walled carbon nanotubes using ozone generated by dielectric barrier discharge, Jpn. J. Appl. Phys., 10.1143/JJAP.49.055002, 49, 055002, 2010.05, [URL]. |
| 37. | U. Khaled, K. Imasaka and J. Suehiro, Enhancement of microplasma generated in water by adding carbon nanotubes, Journal of Plasma and Fusion Research Series, Volume 8, Pages 603-607, 2009.10, [URL]. |
| 38. | Manipulation and Detection of Bacteria Using Dielectrophoresis. |
| 39. | Wei Sun and Usama Khaled and Hironari Tomita and Kiminobu Imasaka and Junya Suehiro, Effects of ozone generated by dielectric barrier discharge on water-solubility of single-walled carbon nanotubes author="Wei Sun and Usama Khaled and Hironari Tomita and Kiminobu Imasaka and Junya Suehiro", booktitle="Proc. of 19th Int. Sympo. on Plasma Chemistry", pages="P1.8.51", month="7", year="2009", Proc. of 19th Int. Sympo. on Plasma Chemistry, P1.8.51, 2009.07. |
| 40. | Wei Sun and Usama Khaled and Hironari Tomita and Kiminobu Imasaka and Junya Suehiro, Effects of ozone generated by dielectric barrier discharge on water-solubility of single-walled carbon nanotubes, Proc. of 19th Int. Sympo. on Plasma Chemistry, P1.8.51, 2009.07. |
| 41. | Kiminobu Imasaka and Usama Khaled and Wei Sun and Junya Suehiro, pH dependence of water-solubility of single-walled carbon nanotubes treated by microplasma in aqueous solution, Proc. of 19th Int. Sympo. on Plasma Chemistry, P2.15.08, 2009.07. |
| 42. | Dielectrophoretic manipulation of nanomaterials and its application to device fabrication. |
| 43. | J. Suehiro, N. Ikeda, A. Ohtsubo and K. Imasaka, Bacterial detection using a carbon nanotube gas sensor coupled with a microheater for ammonia synthesis by aerobic oxidization of organic components, IET Nanobiotechnology, Volume 3, Issue 2, pp.15-22, 2009.06, [URL]. |
| 44. | K. Imasaka, Y. Kato, U. Khaled and J. Suehiro, Effects of pH on water-solubilization of carbon nanotube using microplasma in aqueous solution, Jpn. J. Appl. Phys., Volume 48, No.6, Paper No.065004, 2009.06, [URL]. |
| 45. | J. Suehiro, N. Ikeda, A. Ohtsubo and K. Imasaka, Fabrication of bio/nano interfaces between biological cells and carbon nanotubes using dielectrophoresis, Microfluidics and Nanofluidics, Volume 5, Number 6, Pages 741-747, 2008.12, [URL]. |
| 46. | K. Imasaka, Y. Kato and J. Suehiro, Effects of gas bubbling on water-solubilization of carbon nanotube using microplasma generated in water, Surface & Coatings Technology, Volume 202, Issues 22-23, Pages 5271-5274, 2008.08, [URL]. |
| 47. | J. Suehiro, K. Imasaka, M. Hara, Optical observations of partial discharge-induced bubbles generated in subcooled liquid nitrogen at atmospheric pressure, IEEE Trans. on Dielectrics and Electrical Insulation, Vol.15, No.3, pp.620-625, 2008.06, [URL]. |
| 48. | J. Suehiro, S. Hidaka, S. Yamane, K. Imasaka, Fabrication of interfaces between carbon nanotubes and catalytic palladium using dielectrophoresis and its application to hydrogen gas sensor, Sensors and Actuators B: Chemical, , Vol.127, No.2, pp.505–511, 2007.11, [URL]. |
| 49. | J. Suehiro, S. Yamane and K. Imasaka, Carbon nanotube-based hydrogen gas sensor electrochemically functionalized with palladium Proceedings of IEEE Sensors 2007, , Proceedings of IEEE Sensors 2007, art. no. 4388458, pp. 554-557, 2007.10, [URL]. |
| 50. | K. Imasaka, Y. Kato, J. Suehiro, Enhancement of microplasma-based water-solubilization of single-walled carbon nanotubes using gas bubbling in water, Nanotechnology, Vol.18, 335602 (7pp), 2007.08, [URL]. |
| 51. | T. Okada, J. Suehiro, Synthesis of nano-structured materials by laser-ablation and their application to sensors, Applied Surface Science, Vol. 253, No. 19, pp. 7840-7847, 2007.07, [URL]. |
| 52. | J. Suehiro, K. Imasaka, Solubilization of carbon nanotubes using microplasma generated in water, Transactions of the Materials Research Society of Japan, Vol. 32, No. 2, pp. 517-522, 2007.06. |
| 53. | W. Ding, K. Ochi, J. Suehiro, K. Imasaka, R. Hayashi, M. Hara, Factors affecting PD detection in GIS using a carbon nanotube gas sensor, IEEE Trans. on Dielectrics and Electrical Insulation, Vol.14, No.3, pp.718-725, 2007.06, [URL]. |
| 54. | W. Ding, R. Hayashi, K. Ochi, J. Suehiro, K. Imasaka, M. Hara, N. Sano, E. Nagao, T. Minagawa, Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes, IEEE Trans. on Dielectrics and Electrical Insulation, Vol.13, No.6, pp.1200-1207, 2006.12, [URL]. |
| 55. | J. Suehiro, A. Ohtsubo, T. Hatano, M. Hara, Selective detection of bacteria by a dielectrophoretic impedance measurement method using an antibody-immobilized electrode chip, Sensors and Actuators B, Chemical, Vol.119, pp.319-326, 2006.11, [URL]. |
| 56. | K. Imasaka, J. Suehiro, Y. Kanatake, Y. Kato, M. Hara, Preparation of water-soluble carbon nanotubes using pulsed streamer discharge in water, Nanotechnology, Vol.17, pp.3421-3427, 2006.07, [URL]. |
| 57. | J. Suehiro, N. Sano, G. Zhou, H. Imakiire, K. Imasaka, M. Hara, Application of dielectrophoresis to fabrication of carbon nanohorn gas sensor, J. Electrostatics, Vol.64, pp.408-415, 2006.06, [URL]. |
| 58. | J. Suehiro, N. Nakagawa, S. Hidaka, M. Ueda, K. Imasaka, M. Higashihata, T. Okada, M. Hara, Dielectrophoretic fabrication and characterization of ZnO nanowire-based UV photosensor, Nanotechnology, Vol.17, pp.2567?2573, 2006.05, [URL]. |
| 59. | K. Imasaka, Y. Kanatake, Y. Ohshiro, J. Suehiro, M. Hara, Production of carbon nanoonions and nanotubes using an intermittent arc discharge in water, Thin Solid Films, Vol.506/507, pp.250-254, 2006.05, [URL]. |
| 60. | W. Ding, R. Hayashi, J. Suehiro, G. Zhou, K. Imasaka, M. Hara, Calibration methods of carbon nanotube gas sensor for partial discharge detection in SF6, IEEE Trans. on Dielectrics and Electrical Insulation, Vol.13, No.2, pp.353-361, 2006.04, [URL]. |
| 61. | J. Suehiro, H. Imakiire, S. Hidaka, W. Ding, G. Zhou, K. Imasaka, M. Hara, Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis, Sensors and Actuators B, Chemical, Vol.114, pp.943?949, 2006.04, [URL]. |
| 62. | J. Suehiro, G. Zhou, H. Imakiire, W. Ding, M. Hara, Controlled fabrication of carbon nanotube NO2 gas sensor using dielectrophoretic impedance measurement, Sensors and Actuators B, Chemical, 10.1016/j.snb.2004.09.048, 108, 1-2, 398-403, Vol.108, pp.398-403, 2005.07, [URL]. |
| 63. | J. Suehiro, T. Hatano, M. Shutou and M. Hara, Improvement of electric pulse shape for electropermeabilization-assisted dielectrophoretic impedance measurement for high sensitive bacteria detection, Sensors and Actuators B, Chemical, 10.1016/j.snb.2004.12.048, 109, 2, 209-215, Vol.109, pp.209-215, 2005.01, [URL]. |
| 64. | J. Suehiro, G. Zhou, M. Hara, Detection of partial discharge in SF6 gas using a carbon nanotube-based gas sensor, Sensors and Actuators B, Chemical, 10.1016/j.snb.2004.05.050, 105, 2, 164-169, Vol.105, pp.164-169, 2004.07, [URL]. |
| 65. | J. Suehiro, K. Imasaka, Y. Ohshiro, G. Zhou, M. Hara, N. Sano, Production of carbon nanoparticles using pulsed arc discharge triggered by dielectric breakdown in water , Jpn. J. Appl. Phys., 10.1143/JJAP.42.L1483, 42, 12A, L1483-L1485, Vol.42, pp.L1483-L1485, 2003.12, [URL]. |
| 66. | J. Suehiro, M. Shutou, T. Hatano, M. Hara, High sensitive detection of biological cells using dielectrophoretic impedance measurement method combined with electropermeabilization, Sensors and Actuators B: Chemical, 10.1016/S0925-4005(03)00517-3, 96, 1-2, 144-151, Vol.96, No.1/2, pp.144-151, 2003.11, [URL]. |
| 67. | J. Suehiro, G. Zhou, M .Hara, Fabrication of a carbon nanotube-based gas sensor using dielectrophoresis and its application for ammonia detection by impedance spectroscopy, Journal of Physics D: Applied Physics, 10.1088/0022-3727/36/21/L01, 36, 21, L109-L114, Vol.36, No.21, pp.L109-L114, 2003.11, [URL]. |
| 68. | J. Suehiro, G. Zhou, M. Imamura, M. Hara, Dielectrophoretic filter for separation and recovery of biological cells in water, IEEE Trans. on Industry Applications, 10.1109/TIA.2003.816535, 39, 5, 1514-1521, Vol.39, No.5, pp.1514-1521, 2003.09, [URL]. |
| 69. | J. Suehiro, D. Noutomi, M. Shutou, M. Hara, Selective detection of specific bacteria using dielectrophoretic impedance measurement method combined with antigen-antibody reaction, J. Electrostatics, 10.1016/S0304-3886(03)00062-7, 58, 3-4, 229-246, Vol.58, No.3/4, pp.229-246, 2003.06, [URL]. |
| 70. | J. Suehiro , R. Hamada, D. Noutomi, M. Shutou, M. Hara, Selective etection of viable bacteria using dielectrophoretic impedance measurement method, J. Electrostatics, Vol.57, No.2, pp.157-168, 2003.02, [URL]. |
| 71. | M. Hara, H. Nakagawa, T. Shinohara, J. Suehiro, Generation, Growth and Collapse of Bubbles on Collision of Particle with Electride in DC Electrically Stressed Liquid Helium, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/TDEI.2002.1115484, 9, 6, 910-921, Vol.9, No.6, pp.910-921, 2002.12. |
| 72. | K. Sakai, Y. Khan, Q. Zhang, J. Suehiro, M. Hara, Importance of the Consideration of Electrical Gradient Force Acting on Foreign Conducting Particle in the Insulation Design of GIS, Proc. of the 14th Conf. of the Electric Power Supply Industry, pp.7-12, 2002.11. |
| 73. | T. Kurihara, T. Nishioka, J. Suehiro, N. Hayashi, M. Hara, Experimental Study of PD Characteristics around a Triple Junction in Atmospheric Air, Proc. of 2002 Joint Conf. of ACED and K-J Sympo. on ED and HVE, pp.495-498, 2002.11. |
| 74. | M. Hara, T. Kurihara, S. Kozuru, J. Suehiro, N. Hayashi, Estimation of partial Discharge Characteristics in Gases around Triple Junction, Proc. of the 14th Conf. of the Electric Power Supply Industry, pp.19-24, 2002.11. |
| 75. | G. Zhou, M. Imamura, J. Suehiro, M. Hara, Elimination of Fine particles Suspended in Liquid Using Dielectrophoresis, Proc. of 2002 Joint Conf. of ACED and K-J Sympo. on ED and HVE, pp.27-30, 2002.11. |
| 76. | Y. Khan, A. Oda, Q. Zhang, J. Suehiro, M. Hara, S. Okabe, Effect of Voltage Wavwform on Particle-triggered Pre-breakdown Phenomena in Diverging Air Gap with Simple Shaped Spacer, Proc. of 2002 Joint Conf. of ACED and K-J Sympo. on ED and HVE, pp.366-369, 2002.11. |
| 77. | Y. Khan, K. Sakai, E. Lee, J. Suehiro, M. Hara, A Basic Study of Deactivation Methods of Free Conducting Particles around Spacers between Non-parallel Plane Electrodes under DC Voltage, Proc. of the 14th Conf. of the Electric Power Supply Industry, pp.13-18, 2002.11. |
| 78. | Y. Khan, K. Sakai, S. Okabe, J. Suehiro, M. Hara, Importance of the Consideration of Electrical Gradient Force in the Deactivation of Free Conducting Particle under DC Voltage, Proc. of the IEEE/PES Transmission and Distribution Conf, 904-908, pp.904-908, 2002.10. |
| 79. | G. Zhou, M. Imamura, J. Suehiro, M. Hara, A Dielectrophoretic Filter for Separation and Collection of Fine Particles Suspended in Liquid, Conf. Records of the 2002 IEEE Industry Applications Conf., 37th IAS Annual Meeting, 1404-1411, pp.1404-1411, 2002.10. |
| 80. | K. Sakai, D. L. Abella, J. Suehiro, M. Hara, Charging and Behavior of a Spherically Conducting Particle on a Dielectrically Coated Electrode in the Presence of Electrical Gradient Force in Atmospheric Air, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/TDEI.2002.1024436, 9, 4, 577-588, Vol.9, No.4, pp.577-588, 2002.08. |
| 81. | M. Hara, H. Nakagawa, J. Suehiro, T. Shinohara, Electrical Breakdown Triggered by Free Conducting Spherical Particle in Saturated Liquid HeI and HeII under Uniform Dc Field, Proc. of 14th Int. Conf. on Dielectric Liquids, 10.1109/ICDL.2002.1022703, 99-102, pp.99-102, 2002.07. |
| 82. | M. Hara, J. Suehiro, H. Maeda, H. Nakashima, PD Per-Breakdown Phenomena and Breakdown Characteristics in the Presence of Conducting Particles in Liquid Nitrogen, IEEE Trans. on Dielectrics and Electrical Insulation, Vol.9, No.1, pp.23-30, 2002.02. |
| 83. | B. Y. Seok, H. Komatsu, M. Kushinaga, J. Suehiro, M. Hara, Pressurizing and Sub-cooling Effects on Electrical Breakdown of LN$_{2}$ in Modeled HTS Coils, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/94.971460, 8, 6, 1016-1024, Vol.8, No.6, pp.1016-1024, 2001.12. |
| 84. | T. Kurihara, S. Kozuru, J. Suehiro, M. Hara, H. Okamoto, Partial Discharge Inception in an Air-filled Void at Cryogenic Temperatures under Superimposed Sinusoidal Voltage, Proc. of 2001 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.25-28, 2001.11. |
| 85. | M. Hara, T. Kurihara, S. Kozuru, J. Suehiro, N. Hayashi, PD Onset Characteristics around a Triple Junction in Atmospheric Air at Room Temperature, Proc. of 2001 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.57-60, 2001.11. |
| 86. | K. Takahashi, K. Imasaka, J. Suehiro, M. Hara, Effects of the Voltage Polarity on the Gas-Puff Z-Pinch Characteristics in an IPP System, Proc. of 2001 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.273-276, 2001.11. |
| 87. | K. Sakai, Q. Zhang, Y. Khan, E. Lee, A. Oda, J. Suehiro, M. Hara, Dependence of Particle-Triggered Breakdown Voltage on N$_{2}$ and SF$_{6}$ Gas Pressure in DC Field between Non-Parallel Plane Electrodes, Proc. of 2001 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.269-272, 2001.11. |
| 88. | Y. Khan, E. Lee, A. Oda, K. Sakai, Q. Zhang, J. Suehiro, M. Hara, Characteristics of Corona and Surface Flashover Triggered by Free Conducting Particle around Simple Shaped Spacer under DC Voltage in Atmospheric Air, Proc. of 2001 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.101-104, 2001.11. |
| 89. | Y. Khan, K. Sakai, E. Lee, J. Suehiro, M. Hara, Free-Conducting Spherical Particle Motion around Different Shaped Spacers under DC Voltage, Proc. of 12th Int. Sympo. on High Voltage Engineering, pp.294-297, 2001.08. |
| 90. | T. Kurihara, S. Kozuru, J. Suehiro, M. Hara, Effect of Superimposed Sinusoidal Voltage on Partial Discharge Characteristics in an Artificial Air-Filled Void, Proc. of 12th Int. Sympo. on High Voltage Engineering, pp.1035-1038, 2001.08. |
| 91. | K. Sakai, Y. Khan, E. Lee, J. Suehiro, M. Hara, Effect of Microdischarge Occurrences on Spherical Conducting Particle Motion between Non-Parallel Plane Electrodes, Proc. of 12th Int. Sympo. on High Voltage Engineering, pp.302-305, 2001.08. |
| 92. | K. Imasaka, K. Takahashi, J. Suehiro, M. Hara, Polarity Effect on the Behavior of Gas-Puff Z-Pinch Plasma Produced by IPP System, Proc. of 28th IEEE Int. Conf. on Plasma Science and 13th IEEE Int. Pulsed Power Conf., 757-760, pp., 2001.06. |
| 93. | T. Kurihara, S. Kozuru, K. Imasaka, J. Suehiro, M. Hara, PD Characteristics in an Air-filled Void at Room Temperature under Superimposed Sinusoidal Voltages, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/94.919953, 8, 2, 269-275, Vol.8, No.2, pp.269-275, 2001.04. |
| 94. | K. Funaki, M. Iwakuma, K. Kajikawa, M. Hara, J. Suehiro, T. Ito, Y. Takata, T. Bohno, S. Nose, M. Konno, Y. Yagi, H. Maruyama, T. Ogata, S. Yoshida, K. Ohashi, H. Kimura, K. Tsutsumi, Development of a 22kV/6.9kV Single-Phase Model for a 3MVA HTS Power Transformer, IEEE Trans. Appl. Supercond., 10.1109/77.920079, 11, 1, 1578-1581, Vol.11, No.1, pp.1578-1581, 2001.03. |
| 95. | K. Imasaka, K. Kawazoe, Y. Kawauchi, S. Hara, J. Suehiro, M. Hara, Reduction of the Source Size of Gas-Puff Z-Pinch Plasmas Using an Inductive Pulsed Power System, Rev of Sci. Instrum, 10.1063/1.1322576, 71, 12, 4438-4444, Vol.71, No.12, pp.4438-4444, 2000.12. |
| 96. | M. G. Danikas, S. Tsuru, M. Nakamura, T. Mine, J. Suehiro, M. Hara, PD Characteristics and Mechanisms in Artificial Air-Filled Voids at Room and Liquid Nitogen Temperatures, IEEE Trans. on. Dielectrics and Electrical Insulation, Vol.7, No.6, pp.875-876, 2000.12. |
| 97. | H. Lee, J. Suehiro, D. Lee, M. So, M. Hara, Energy Efficiency Improvement of Electrical Sterilization Using Oscillatory Waveforms from a RLC Discharging Circuit, IEEE Trans. on. Dielectrics and Electrical Insulation, 7, 6, 872-874, Vol.7, No.6, pp.872-874, 2000.12. |
| 98. | K. Imasaka, T. Masaki, K. Kawazoe, J. Suehiro, M. Hara, Spatial Distribution of Hot Spots Produced by Gas-Puff Z-Pinch Using Inductive Pulsed Power Generator, Proc. of 10th Asian Conf. on Electrical Discharge, pp.227-230, 2000.11. |
| 99. | T. Kurihara, S. Tsuru, J. Suehiro, M. Hara, Simulation of Partial Discharge in an Artificial Air-Filled Void under Superimposed Sinusoidal Voltages, Proc. of 10th Asian Conf. on Electrical Discharge, pp.123-126, 2000.11. |
| 100. | J. Maruyama, F. Shimokawa, G. B. Zhou, J. Suehiro, M. Hara, AC Electrical Tree Initiation and Growth Characteristics in XLPE under UV Irradiation, Proc. of 10th Asian Conf. on Electrical Discharge, pp.127-130, 2000.11. |
| 101. | M. Hara, T. Kurihara, S. Kozuru, J. Suehiro, N. Hayashi, New Estimation Method of Partial Discharge Characteristics in Gas around a Triple Junction, Proc. of 2000 Korea-Japan Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.504-1 - 504-4, 2000.10. |
| 102. | K. Sakai, D. L. Abella, J. Suehiro, M. Hara, Mode of Free-Conducting Particle Motion and Particle-Triggered Breakdown Mechanism in Non-uniform Field Gaps, Proc. of 2000 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 389-392, pp.389-392, 2000.10. |
| 103. | K. Sakai, E. Lee, Y. Khan, J. Suehiro, M. Hara, Effect of Spacers on Free Conducting Particle Motion within Diverging Air Gap, Proc. of 2000 Korea-Japan Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.601-1 - 601-4, 2000.10. |
| 104. | R. Hamada, D. Noutomi, J. Suehiro, R. Yatsunami, M. Hara, Selective Detection of Viable and Non-viable Bacteria by Using Dielectrophoretic Impedance Measurement Method, Proc. of Int. Conf. on Electrical Engineering 2000, pp.1081-1084, 2000.07. |
| 105. | K. Sakai, D. L. Abella, J. Suehiro, M. Hara, Lateral Motion of Wire Particles toward Decreasing Electrode Gap Regions in Atmospheric Air, Proc. of the 6th Int. Conf. on Properties and Applications of Dielectric Materials, 817-820, pp.817-820, 2000.06. |
| 106. | H. Lee, J. Suehiro, M. Hara, D. Lee, M. So, Optimal Condition of Waveforms for Electrical Sterilization of {?it Escherichia coli?/} by HV Impulse, 静電気学会誌, Vol.24, No.4, pp.213-217, 2000.04. |
| 107. | B. Y. Seok, H. Komatsu, J. Suehiro, M. Hara, Partial and Complete Electrical Breakdown in Simulated High Temperature Superconducting Coils, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/94.839344, 7, 1, 78-86, Vol.7, No.1, pp.78-86, 2000.02. |
| 108. | J. Suehiro, R. Yatsunami, R. hamada, M. Hara, Quantitive Estimation of Biological Cell Concentration Suspended in Aqueous Medium by Using Dielectrophoretic Impedance Measurement Method, J.Phys. D: Appl. Phys., Vol.32, pp.2814-2820, 1999.11, [URL]. |
| 109. | S. Tsuru, T. Kurihara, J. Suehiro, M. Hara, PD Characteristics in Air-Filled Void at Room Temperature under the Condition of Simulated Inverter Surges, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.208-211, 1999.10. |
| 110. | D. L. Abella, K. Sakai, P. Attaviriyanupap, J. Suehiro, M. Hara, Free Conducting Particle Charging and Behavior in the Gap between Non-Parallel Bare and Coated Electrodes, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.45-48, 1999.10. |
| 111. | H. K. Lee, J. Suehiro, M. Hara, M. H. So, D. C. Lee, Effect of Sterilization of Soya by HV Impulse Waveform, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.204-207, 1999.10. |
| 112. | K. Sakai, D. L. Abella, P. Attaviriyanupap, J. Suehiro, M. Hara, Breakdown Triggered by Migration of Free Conducting Particles from Low to High Electric Field Regions, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.239-242, 1999.10. |
| 113. | K. Imasaka, T. Masaki, J. Suehiro, M. Hara, Behavior of the Gas-Puff Z-Pinch Plasma Produced by Inductive Pulsed Power Generator and its Characteristics, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.200-203, 1999.10. |
| 114. | B. Y. Seok, H. Komatsu, M. Kushinaga, J. Suehiro, M. Hara, A Study of PBD Phenomena Triggered by Induced Bubble in the Simulated Electrode System of Superconducting Coils, Proc. of 1999 Japan-Korea Joint Sympo. on Electrical Discharge and High Voltage Engineering, pp.301-304, 1999.10. |
| 115. | S. Tsuru, T. Mine, J. Suehiro, M. Hara, Partial Discharge Degradation of Solid Insulators with an Air-Filled Void at Liquid Nitrogen Temperature, Proc. of 11th Int. Sympo. on High-Voltage Engineering, pp.369-372, 1999.08. |
| 116. | J. Suehiro, K. Tsutsumi, D. Tsuji, S. Ohtsuka, K. Imasaka, M. Hara, Fast Quench of Superconducting Wire by Pulsed Current and its Application to Pulsed Power Generation, Proc. of 11th Int. Sympo. on High-Voltage Engineering, pp.390-393, 1999.08. |
| 117. | B. Y. Seok, H. Komatsu, J. Suehiro, M. Hara, Bubble Behavior and PBD Characteristics in the Simulated Electrode System of High Temperature Superconducting Coils, Proc. of 11th Int. Sympo. on High-Voltage Engineering, pp.372-375, 1999.08. |
| 118. | M. Hara, J. Suehiro, H. Maeda, H. Nakashima, DC Pre-Breakdown Phenomena and Breakdown Characteristics in the Presence of Metallic Particle in Liquid Nitrogen, Proc. of 1999 IEEE 13th Int. Conf. on Dielectric Liquids, pp.457-461, 1999.07. |
| 119. | J. Suehiro, D. Tsuji, K. Tsutsumi, S. Ohtsuka, M. Hara, Quench Time Lag and its Statistical Characteristics of NbTi Mechanical PCS Measured with Pulsed Current, IEEE Trans. on Applied Superconductivity, 10.1109/77.783496, 9, 2, 1125-1128, Vol.9, No.2, pp.1125-1128, 1999.06. |
| 120. | S. Ohtsuka, T. Nakamura, D. Tsuji, J. Suehiro, M. Hara, Quench Characteristics of Parallel Circuit of Two Mechanical PCS's, IEEE Trans. on Applied Superconductivity, 10.1109/77.783486, 9, 2, 1085-1088, Vol.9, No.2, pp.1085-1088, 1999.06. |
| 121. | S. Tsuru, M. Nakamura, T. Mine, J. Suehiro, M. Hara, PD Characteristics and Mechanisms in Artificial Air-Filled Voids at Room and Liquid Nitrogen Temperatures, IEEE Trans. on Dielectrics and Electrical Insulation, 10.1109/94.752008, 6, 1, 43-50, Vol.6, No.1, pp.43-50, 1999.02. |
| 122. | S. Ohtsuka, D. Tsuji, K. Tsutsumi, J. Suehiro, M. Hara, Effect of Quench Time Lag on the Succeeding Quench in the Parallel Mechanical PCS Circuit, Proc. of 11th Int. Sympo. on Superconductivity, pp.SAP-28, 1998.11. |
| 123. | S. Ohtsuka, T. Nakamura, D. Tsuji, J. Suehiro, M. Hara, Quench Current Characteristics of Parallel Mechanical PCSs, Proc. of 15th Int. Conf. on Magnet Technology, pp.551-554, 1998.10. |
| 124. | T. Mine, S. Tsuru, J. Suehiro, M. Hara, PD Degradation of Solid Insulators with an Artificial Air-Filled Voids at Room and Liquid Nitrogen Temperatures, Proc. of 1998 Korea-Japan Joint Symp. on ED and HVE, pp.65-68, 1998.10. |
| 125. | H. K. Lee, J. Suehiro, M. Hara, D. C. Lee, Measurement of optima HV impulse Waveshape for electrical sterlization of Escherichia coli, Proc. of 1998 Korea-Japan Joint Symp. on ED and HVE, pp.179-182, 1998.10. |
| 126. | K. Kawazoe, T. Masaki, K. Imasaka, J. Suehiro, M. Hara, Gap Length Dependence of Soft X-ray Emission from Gas-Puff Z-Pinch Plasma Produced by Inductive Pulsed Power Generator, Proc. of 1998 Korea-Japan Joint Symp. on ED and HVE, pp.175-178, 1998.10. |
| 127. | M. Hisao, N. Hideki, J. Suehiro, M. Hara, D.c.Pre-Breakdown Phenomena and Breakdown Voltage Characteristics of a Parallel Plane Gap in the Presence of Free Conducting Particles in Liquid Nitrogen, Proc. of 1998 Korea-Japan Joint Symp. on ED and HVE, pp.111-114, 1998.10. |
| 128. | S. Ohtsuka, H. Ohtsubo, T. Nakamura, J. Suehiro, M. Hara, Characteristics of NbTi Mechanical Persistent Current Switch and Mechanism of Superconducting Connection at Contact, Cryogenics, 10.1016/S0011-2275(98)00079-4, 38, 9, 893-902, Vol.38, No.9, pp.893-902, 1998.09. |
| 129. | J. Suehiro, P. Pethig, The dielectrophoretic movement and positioning of a biological cell using a three-dimensional grid electrode system, J. Phys. D:Appl. Phys., 10.1088/0022-3727/31/22/019, 31, 22, 3298-3305, Vol.31, No.22, pp.3298-3305, 1998.06, [URL]. |
| 130. | S. Tsuru, M. Nakamura, T. Mine, J. Suehiro, M. Hara, Partial Discharge Inception Characteristics in Artificial Air-Filled Voids at Room and Liquid Nitrogen Temperatures, Conf. Record of the IEEE Int. Sympo. on Electrical Insulation, 153-156, pp.153-156, 1998.06. |
| 131. | K. Imasaka, Y. Kawauchi, K. Kawazoe, J. Suehiro, M. Hara, Numerical and Experimental Study of Behavior of Gas-Puff Z-Pinch Plasma Produced by Indutive Pulsed Power Generator, Proc. of the 15th Int. Conf. on High-Power Particle Beams, pp.printing, 1998.06. |
| 132. | K. Funaki, M. Iwakuma, K. Kajikawa, M. Takeo, J. Suehiro, M. Hara, K. Yamafuji, M. Konno, Y. Kasagawa, K. Okubo, Y. Yasukawa, S. Nose, M. Ueyama, K. Hayashi, K. Sato, Development of a 500 kVA-class oxide-supercon- ducting power transformer operated at liquid-nitrogen temperature, Cryogenics, 10.1016/S0011-2275(97)00134-3, 38, 2, 211-220, Vol.38, No.2, pp.211-220, 1998.02. |
| 133. | S. Ohtsuka, T. Nakamura, D. Tsuji, J. Suehiro, M. Hara, Quench Current Characteristics of Parallel Mechanical PCS, Proc. of 15th Int. Conf. on Magnet Technology, pp.PB-13, 1997.10. |
| 134. | S. Tsuru, M. Nakamura, T. Mine, K. Sakai, J. Suehiro, M. Hara, Partial Discharge Mode and Mechanism in Artificial Air-Filled Voids at Room Temperature, Proc. of 1997 Japan-Korea Joint Sympo. on ED and HVE, pp.39-42, 1997.10. |
| 135. | H. K. Lee, M. H. So, J. Suehiro, M. Hara, D. C. Lee, Optimal RLC Condition to Electrical Sterilization of Escherichia coli by HV Impulse, Proc. of 1997 Japan-Korea Joint Sympo. on ED and HVE, pp.121-124, 1997.10. |
| 136. | S. Ohtsuka, T. Nakamura, D. Tsuji, J. Suehiro, M. Hara, Arc Discharge Characteristics Generated by Opening a NbTi Mechanical PCS, Proc. of 1997 Japan-Korea Joint Sympo. on ED and HVE, pp.141-144, 1997.10. |
| 137. | Y. Kawauchi, K. Kawazoe, K. Imasaka, J. Suehiro, M. Hara, Analysis of Pinching Process of Gas-Puff Z-Pinch Plasma Produced by Inductive Pulsed Power Generator, Proc. of 1997 Japan-Korea Joint Sympo. on ED and HVE, pp.129-132, 1997.10. |
| 138. | K. Funaki, M. Iwakuma, M. Takeo, K. Yamafuji, J. Suehiro, M. Hara, M. Konno, Y. Kasagawa, I. Itoh, S. Nose, M. Ueyama, K. Hayashi, K. Sato, Preliminary Tests of A 500 kVA-Class Oxide Superconducting Transformer Cooled by Subcooled Nitrogen, IEEE Trans. on Appl. Supercond., 10.1109/77.614630, 7, 2, 824-827, Vol.7, No.2, pp.824-827, 1997.07. |
| 139. | S. Ohtsuka, H. Ohtsubo, T. Nakamura, D. Tsuji, J. Suehiro, M. Hara, Feasibility Study on a Mechanical Persistent Current Switch in SMES, Proc. of Int. Conf. on Electrical Engineering, pp.102-105, 1997.07. |
| 140. | K. Imasaka, S. Hara, Y. Kawauchi, K. Kawazoe, J. Suehiro, M. Hara, Soft X-ray Emission from the Gas-puff Z-pinch Plasma Produced by an Inductive Pulsed Power Generator, Proc. of IEEE Int. Conf. on Pulsed Power, 845-850, pp.p1-59, 1997.06. |
| 141. | K. Funaki, K. Iwakuma, M. Takeo, K. Yamafuji, J. Suehiro, M. Hara, M. Konno, Y. Kasagawa, I. Itoh, S. Nose, M. Ueyama, K. Hayashi, K. Sato, Preliminary Tests of a 500kVA-Class Oxide Superconducting Transformer Cooled by Subcooled Nitrogen, IEEE Trans. on Applied Superconductivity, 10.1109/77.614630, 7, 2, 824-827, Vol.7, No.2, pp.824-827, 1997.06. |
| 142. | S. Tsuru, M. Nakamura, K. Funaki, M. Iwakuma, J. Suehiro, M. Hara, Partial Discharge Characteristics in Artificial Air-Filled Voids Immersed in Liquid Nitrogen, Proc. of the 5th ICPADM, 228-231, pp.228-231, 1997.05. |
| 143. | H. K. Lee, J. Suehiro, M. H. So, M. Hara, D. C. Lee, Measurement of Excellent Condition to RLC Parameter for Electrical Sterilization on Escherichia coli, Proc. of the 5th ICPADM, pp.1136-1139, 1997.05. |
| 144. | K. Funaki, M. Iwakuma, M. Takeo, K. Yamafuji, J. Suehiro, M. Hara, M. Konno, Y. Kasagawa, K. Okubo, Y. Yasukawa, S. Nose, M. Ueyama, K. Hayashi, K. Sato, Design and Construction of a 500 kVA-Class Oxide Superconducting Power Transformer Cooled by Liquid Nitrogen, Proc. of 16th Int. Cryo. Eng. Conf. / Int. Cryo. Mat. Conf., pp.1009-1012, 1997.03. |
| 145. | K. Funaki, M. Iwakuma, M. Takeo, K. Yamafuji, J. Suehiro, M. Hara, M. Konno, Y. Kasagawa, K. Ohkubo, Y. Yasukawa, S. Nose, M. Ueyama, K. Hayashi, K. Sato, Design and Construction of A 500kVA-Class Oxide Superconducting Power Transformer Cooled by Liquid Nitrogen, Proc. ICEC16/ICMC, pp.1009-1012, 1997.02. |
| 146. | M. Miyama, T. Takahashi, K. Ohno, J. Suehiro, M. Hara, Size Effects and Breakdown Mechanism in Superfluid Helium, Proc. of 8th ACED, pp.203-1-203-4, 1996.10. |
| 147. | K. Imasaka, S. Hara, Y. Kawauchi, J. Suehiro, M. Hara, Gas-puff Z-pinch driven by a Fast Bank, Proc. of 8th ACED, pp.406-1-406-4, 1996.10. |
| 148. | S. Ohtsuka, H. Ohtsubo, T. Nakamura, J. Suehiro, M. Hara, Contact Resistance Characteristics of Mechanical Switch Made of NbTi, Proc. of 8th ACED, pp.711-1-711-4, 1996.10. |
| 149. | J. Suehiro, K. Ohno, T. Takahashi, M. Miyama, M. Hara, Size Effect and Statistical Characteristics of DC and Pulsed Breakdown of Liquid Helium, IEEE Trans. on DEI, 10.1109/94.536729, 3, 4, 507-514, Vol.3, No.4, pp.507-514, 1996.08. |
| 150. | J. Suehiro, K. Ohno, T. Takahashi, M. Miyama, M. Hara, Statistical Characteristics of Electrical Breakdown in Saturated Superfluid Helium, Proc. of 12th ICDL, 320-323, pp.320-323, 1996.07. |
| 151. | H. K. Lee, J. Suehiro, M. H. So, M. Hara, D. C. Lee, Electrical Sterlization of Escherichia coli by HV Impulse and Effect of Voltage Waveforms, Proc. of Korea-Japan Sympo. on Electrical Discharge and High Voltage Engineering, pp.59-62, 1996.05. |
| 152. | K. Imasaka, S. Hara, H. Tokutomi, T. Akine, I. Nakamura, J. Suehiro, M. Hara, Compact Pulsed Power Generator and its Applications to Electrical Insulation Test, Proc. of Korea-Japan Sympo. on Electrical Discharge and High Voltage Engineering, pp.245-249, 1996.05. |
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