安川 智之
兵庫県立大学大学院物質理学研究科
〒678-1297 兵庫県赤穂郡上郡町光都3-2-1

T. Yasukawa
Graduate School of Material Science, University of Hyogo 3-2-1, Kouto, Kamigori, Ako, Hyogo 678-1297, Japan

Abstract

A rapid immunosensing method for measuring two tumor markers, alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA), based on particle manipulation by negative dielectrophoresis (n-DEP) was developed. When microparticles modified with different antibodies were subjected to n-DEP manipulation by the application of an AC voltage, they accumulated in particular positions in poly(dimethylsiloxane) (PDMS) fluidic channels modified with corresponding antibodies within 1 min. The presence of a specific antigen, AFP or CEA, allowed the irreversible capture of microparticles via the formation of immuno-complexes. Uncaptured microparticles redispersed after the AC voltage was switched off. The fluorescent intensity from the irreversibly captured microparticles allowed us to determine the concentration of AFP and CEA in the sample. The range for both AFP and CEA assays was 0.1-100 ng/mL, which was sufficient to cover the concentration required for medical diagnoses. Our system measured the concentrations of AFP and CEA simultaneously in a single device with two channels modified for different antibodies. Since n-DEP was used for the rapid manipulation of the microparticles toward the PDMS surface, the time required for the assay was substantially short: 1 min for forcing and 5 min for redispersion of microparticles and sensing.

赤丸悟士、岡﨑圭祐、原 正憲、波多野雄治、松山政夫
富山大学水素同位体科学研究センター
〒930-8555 富山市五福3190

S. Akamaru, K. Okazaki, M. Hara, Y. Hatano, M. Matsuyama
Hydrogen isotope research center, University of Toyama Gofuku 3190, Toyama 〒930-8555, Japan

Abstract

We estimate the amount of hydrogen isotope gas stored in getter materials without using a desorption process and by measuring the magnetic susceptibility of ZrNi-H systems. The magnetic susceptibility of ZrNiH x increased with an increase in the hydrogen content, x, reaching a maximum value at x ≅ 0.5. As x > 0.5, the magnetic susceptibility began to decrease and reached a minimum value at x= 2.7. The behavior of magnetic susceptibility could be qualitatively modeled using the molar fractions of the ZrNi, monohydride, and trihydride phases observed using X-ray diffraction analysis.

本多 祐二、井上 光浩、阿部 孝之
富山大学水素同位体科学研究センター
〒930-8555　富山市五福3190

Y. Honda, M. Inoue, T. Abe
Hydrogen Isotope Research Center, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan

Abstract

This report describes the outline of the “polygonal barrel-plasma chemical vapor deposition (CVD) method” and its units in detail. This method is embodied as a new particle surface modification system consisting of 5 parts: 1) a gas-supply unit, 2) a vacuum chamber unit (including gas shower and barrel electrodes), 3) a radio frequency (RF) power supply unit (including matching box), 4) a vacuum pumps, and 5) a control unit. In this method, a hexagonal barrel containing particles is rotated or oscillated during plasma CVD, leading to the efficient and uniform surface modification of individual particles with various materials, especially carbon and metal oxides. In addition, the film thicknesses of the deposited materials can be controlled very easily by changing the RF power and treatment time. Thus, the polygonal barrel-plasma CVD method allows controllable surface modification of particles and is useful for research and development of functionalized particles.

奥島 康正、井上 光浩、阿部 孝之
富山大学　水素同位体科学研究センター
〒930-8555　富山市五福　3190

Y. Okushima, M. Inoue, T. Abe
Hydrogen Isotope Research Center, University of Toyama Gofuku 3190, Toyama 930-8555, JAPAN

Abstract
Electrochemical degradation resistance of carbon-supported Pt and TiN (Pt/TiN/C) cathode catalysts for polymer electrolyte fuel cells prepared using the polygonal barrel-sputtering method was investigated. The characterization of the prepared carbon-supported TiN (TiN/C) samples showed that TiN nanoparticles were uniformly deposited on the surfaces of the carbon particles. Subsequently, Pt/TiN/C catalysts were prepared by sputtering Pt on the TiN/C samples. The change in electrochemical surface areas (ESAs) of the obtained samples was evaluated by successive potential cycling. As compared with the carbon-supported Pt catalyst, the Pt/TiN/C catalyst with the amount of TiN deposited of 10 wt.% showed smaller ESA reduction after 100th potential cycling. The effects of TiN on the ESA reduction became greater by increasing the amount of deposited TiN from 10 to 24 wt.%, although the ESA absolute values decreased. These results demonstrate that TiN deposition is useful to prevent ESAs from reduction and improve the durability of PEFCs.

小林 かおり、槇 泰喜、山本 拓也、原 正憲、波多野 雄治

^a 富山大学 理学部 物理学科
〒930-8555 富山市五福3190
^b富山大学 水素同位体科学研究センター
〒930-8555 富山市五福3190

K. Kobayashi^a, H. Maki^a, T. Yamamoto^a, M. Hara^b, Y. Hatano^b
aDepartment of Physics, Faculty of Science, University of Toyama Gofuku 3190, Toyama 930-8555, Japan
^bHydrogen Isotope Research Center, University of Toyama Gofuku 3190, Toyama 930-8555, Japan

Abstract

Near-infrared spectroscopy has potential as a new suitable tool to detect tritiated water (HTO, T2O). We previously carried out the initial study with a single-walled cell system and got some spectra of tritiated water vapor. Because of the radioactive nature of tritium, tritiated water was decomposed into tritium gas and oxygen by radiochemical reactions, and there was a need for a reoxidizing system and other updates to improve tritium recycling and safety issues. Therefore, we developed a new double-walled cell system and tested its basic performance. The performance of the cell was found to be appropriate for the prolonged measurement of the spectra of tritiated water vapor.

田口 明¹、杉山貴彦²、森田洋平²、田中将裕³、古藤健司⁴、宗像健三⁵

¹富山大学 水素同位体科学研究センター　
〒930-8555 富山市五福3190
²名古屋大学大学院工学研究科　
〒319-1195 茨城県那珂郡東海村白方白根2-4
³核融合科学研究所　
〒509-5202 岐阜県土岐市下石町322-6
⁴九州大学大学院工学研究院　
〒819-0395 福岡市西区元岡744番地
⁵秋田大学工学資源学部　
〒010-8502 秋田市手形学園町1-1

A. Taguchi¹, T. Sugiyama², Y. Morita², M. Tanaka³, K. Kotoh⁴,K. Munakata⁵

¹Hydrogen Isotope Research Center, University of Toyama Gofuku 3190, Toyama 930-8555
²Graduate School of Engineering and School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603
³National Institute for Fusion Science Oroshi-Cho 322-6, Toki 509-5292
⁴Graduate School of Engineering, Kyushu University Motooka Nishi-ku 744, Fukuoka 819-0395
⁵Department Faculty of Engineering and Resource Science, Akita University Tegata gakuen-machi 1-1, Akita 010-8502

Abstract

  The porosity and water vapor sorption property of commercially available hydrophobic SiO₂beads were investigated. The hydrophobic SiO₂ beads, the surface of which has been modified by trimethylsilyl functional groups, with a surface area of 70.7 m²/g, a mesopore diameter of about 36 nm and a mesopore volume of about 0.91 cm3/g showed lower water vapor sorption property as compared to the unmodified SiO₂ beads; the amount of monolayer water adsorbed were estimated to be 2.94×10^-3 and 5.12×10^-3 _{g(H2O)/g(adsorbent)} for hydrophobic and unmodified SiO₂ beads, respectively. The evaluation of the heat of water vapor sorption suggests that the suppression of water cluster formation by trimethylsilyl groups is attributed to the hydrophobic property.

原 正憲^a，片山 知香^a，中山 将人^a，松山 政夫^a，廣上 清一^b，高田 英治^c，袋布 昌幹^c，丁子 哲治^d

^a富山大学 水素同位体科学研究センター　
〒930-8555 富山市五福 3190
^b富山大学 自然科学研究支援センター 放射性同位元素実験施設　
〒930-8555 富山市五福 3190
^c富山高等専門学校 専攻科　
〒939-8630 富山市本郷町 13
^d富山高等専門学校 物質化学工学科　
〒939-8630 富山市本郷町 13

M. Hara^a, C. Kataya^a, M. Nakayama^a, M. Matsuyama^a, K. Hirokami^b, E. Takada^c, M. Tafu^c, T. Choji^d

^a Hydrogen Isotope Research Center, University of Toyama Gofuku 3190, Toyama 930-8555, JAPAN
^b Radioisotope Laboratory, Center for Research and Development in Natural Science, University of Toyama Gofuku 3190, Toyama 930-8555, JAPAN
^c Advanced Course, Toyama National College of Technology Hongo machi, Toyama 939-8630, JAPAN
^dDepartment of Applied Chemistry and Chemical Engineering, Toyama National College of Technology Hongo machi, Toyama 939-8630, JAPAN

Abstract

  To confirm the applicability of the modified integral counting method for the radioactivity measurements of low energy beta emitters, the radioactivity measurements of ³⁵S and ¹⁴C were carried out using a liquid scintillation counter. The disintegration rates of ³⁵S and ¹⁴C were evaluated from the liquid scintillation spectra by the modified integral counting method. The disintegration rates thus obtained sufficiently supported the applicability of this method to the radioactivity measurement y liquid scintillation counting without using quenched standards. Discussion was also given concerning the measurement procedures involving the modified integral counting method.