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Tanaka, Hirokazu*; Hashimoto, Takeji; Koizumi, Satoshi; Ito, Hideaki*; Naka, Kensuke*; Chujo, Yoshiki*
Macromolecules, 41(5), p.1815 - 1824, 2008/03
Times Cited Count:8 Percentile:26.71(Polymer Science)We have investigated the self-assembly formed by palladium acetate (Pd(OAc)) and polyamidoamine dendrimers (GN-NH) 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], 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] falls below a critical value and thereby a sufficient amount of Pd(OAc) exists as the binders between the dendrimers. Otherwise dendrimers are molecularly dispersed in solution.
Tanaka, Hirokazu*; Koizumi, Satoshi; Hashimoto, Takeji; Ito, Hideaki*; Sato, Masahide*; Naka, Kensuke*; Chujo, Yoshiki*
Macromolecules, 40(12), p.4327 - 4337, 2007/06
Times Cited Count:32 Percentile:67.79(Polymer Science)We reported the reduction process of palladium(II) acetate, Pd(OAc), 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) in non-aqueous solution. The process was induced by mixing the following two solutions: (A) Pd(OAc) dissolved in N,N-dimethylformamide (DMF) and (B) the G1-NH dissolved in methanol, under a specific condition of [Pd(OAc)]/[-NH] = 3.3 where [-NH] 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.
Hashimoto, Takeji; Tanaka, Hirokazu*; Koizumi, Satoshi; Naka, Kensuke*; Chujo, Yoshiki*
Journal of Applied Crystallography, 40(s1), p.s73 - s77, 2007/04
Times Cited Count:18 Percentile:83.29(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)) in N,N-dimethylformamide and the second-generation polyamidoamine dendrimer in methanol.
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
Times Cited Count:30 Percentile:85.82(Instruments & Instrumentation)no abstracts in English
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
Times Cited Count:12 Percentile:61.35(Instruments & Instrumentation)no abstracts in English