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Journal Articles

Control of self-assembling processes of polyamidoamine dendrimers and Pd nanoparticles

Tanaka, Hirokazu*; Hashimoto, Takeji; Koizumi, Satoshi; Ito, Hideaki*; Naka, Kensuke*; Chujo, Yoshiki*

Macromolecules, 41(5), p.1815 - 1824, 2008/03

https://doi.org/10.1021/ma702034x
 Times Cited Count：8 Percentile：26.86(Polymer Science)

We have investigated the self-assembly formed by palladium acetate (Pd(OAc)$$_{2}$$) and polyamidoamine dendrimers (GN-NH$$_{2}$$) in a mixed solvent of methanol and N, N-dimethylformamide. We aim to explore effects of the generation number (GN) and concentration of the dendrimers, [GN-NH$$_{2}$$], on the self-assembly of the dendrimers (defined hereafter as "templates") and the Pd nanoparticles inside the templates in order to clarify physical factors controlling the self-assembling mechanisms. We found that the templates are formed only when [GN-NH$$_{2}$$] falls below a critical value and thereby a sufficient amount of Pd(OAc)$$_{2}$$ exists as the binders between the dendrimers. Otherwise dendrimers are molecularly dispersed in solution.

Journal Articles

Combined in situ and time-resolved SANS and SAXS studies of chemical reactions at specific sites and self-assembling processes of reaction products; Reduction of palladium ions in self-assembled polyamidoamine dendrimers as a template

Tanaka, Hirokazu*; Koizumi, Satoshi; Hashimoto, Takeji; Ito, Hideaki*; Sato, Masahide*; Naka, Kensuke*; Chujo, Yoshiki*

Macromolecules, 40(12), p.4327 - 4337, 2007/06

https://doi.org/10.1021/ma062930u
 Times Cited Count：32 Percentile：67.9(Polymer Science)

We reported the reduction process of palladium(II) acetate, Pd(OAc)$$_{2}$$, and self-assembling process of the resulting palladium atoms, Pd(0)'s, into nanoparticles in the presence of the first-generation polyamidoamine dendrimer (G1-NH$$_{2}$$) in non-aqueous solution. The process was induced by mixing the following two solutions: (A) Pd(OAc)$$_{2}$$ dissolved in N,N-dimethylformamide (DMF) and (B) the G1-NH$$_{2}$$ dissolved in methanol, under a specific condition of $$r$$ $$equiv$$ [Pd(OAc)$$_{2}$$]/[-NH$$_{2}$$] = 3.3 where [-NH$$_{2}$$] is mole concentration of the amine groups in the dendrimer in the reaction solution. The reaction and reaction-induced self-assembling process were explored in-situ by means of a combined time-resolved method of small-angle neutron scattering and small-angle X-ray scattering. The method revealed time-evolution of a series of self-assembling processes occurring in the system.

Journal Articles

A Combined small-angle scattering study of a chemical reaction at specific sites and reaction-induced self-assembly as a problem in open non-equilibrium phenomena

Hashimoto, Takeji; Tanaka, Hirokazu*; Koizumi, Satoshi; Naka, Kensuke*; Chujo, Yoshiki*

Journal of Applied Crystallography, 40(s1), p.s73 - s77, 2007/04

https://doi.org/10.1107/S0021889807003445
 Times Cited Count：18 Percentile：83.38(Chemistry, Multidisciplinary)

As a problem in open non-equilibrium phenomena, we present small-angle scattering studies of chemical-reaction at specific sites and reaction-induced self-assembly of the system which is induced by mixing two stable solutions of palladium (II) acetate (Pd(OAc)$$_{2}$$) in N,N-dimethylformamide and the second-generation polyamidoamine dendrimer in methanol.

Journal Articles

Scintillation materials for neutron imaging detectors

Katagiri, Masaki; Sakasai, Kaoru; Matsubayashi, Masahito; Nakamura, Tatsuya; Kondo, Yasuhiro*; Chujo, Yoshiki*; Nanto, Hidehito*; Kojima, Takahiro*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.274 - 279, 2004/08

https://doi.org/10.1016/j.nima.2004.04.165
 Times Cited Count：30 Percentile：85.95(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Organic scintillators containing $$^{10}$$B for neutron detectors

Kamaya, Eiki*; Matsumoto, Fukashi*; Kondo, Yasuhiro*; Chujo, Yoshiki*; Katagiri, Masaki

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.329 - 331, 2004/08

https://doi.org/10.1016/j.nima.2004.05.006
 Times Cited Count：12 Percentile：61.53(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Objectives and design of the JT-60 superconducting tokamak

Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Chujo, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.

Nuclear Fusion, 43(7), p.606 - 613, 2003/07

https://doi.org/10.1088/0029-5515/43/7/314

no abstracts in English

Journal Articles

Development of a Decommissioning Engineering Support System

Iguchi, Yukihiro; Kanehia, Yoshiki; Chujo, Masahiro*; Fujinaga, Yoshinori*

Saikuru Kiko Giho, (10), p.59 - 66, 2001/03

https://rdreview.jaea.go.jp/gihou/pdf2/5930.pdf

None

7 (Records 1-7 displayed on this page)
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