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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*

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.

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Category:Polymer Science

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