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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
Author(s) -
Tanaka Hirokazu,
Hashimoto Takeji,
Naka Kensuke,
Chujo Yoshiki,
Koizumi Satoshi
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889807003445
Subject(s) - dendrimer , palladium , chemistry , nanoparticle , methanol , dimethylformamide , self assembly , small angle neutron scattering , radius , scattering , neutron scattering , chemical reaction , chemical engineering , chemical physics , catalysis , nanotechnology , materials science , polymer chemistry , organic chemistry , solvent , optics , physics , computer security , engineering , computer science
As a problem in open non‐equilibrium phenomena, small‐angle scattering (SAS) studies of chemical reactions at specific sites and reaction‐induced self‐assembly of a system which is obtained by mixing two stable solutions of palladium acetate [Pd(OAc) 2 ] in N,N ‐dimethylformamide and the second‐generation polyamidoamine dendrimer in methanol are presented. The self‐assembly was studied using a combination of neutron and X‐ray SAS. The results revealed that the self‐assembly involves the initial formation of aggregates of an average radius of 20 nm composed of the dendrimers and Pd(OAc) 2 followed by formation of palladium nanoparticles of a radius of 2.0 nm inside the aggregates. The aggregates were found to provide a special field for a chemical reaction for reduction of Pd(II) ions with methanol and for the self‐assembly of the reduction products of Pd(0) atoms into nanoparticles. The nanoparticles are found to be trapped and stabilized in the aggregates.