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Mineralization of gold in block copolymer micelles
Author(s) -
Möller Martin,
Spatz Joachim P.,
Roescher Arno,
Mößmer Stefan,
Selvan S. Tamil,
Klok HarmAnton
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971170124
Subject(s) - copolymer , micelle , mineralization (soil science) , materials science , chemical engineering , geology , polymer chemistry , chemistry , polymer , composite material , organic chemistry , aqueous solution , engineering , nitrogen
Ultrasmall gold particles have been prepared inside the micelles of polystyrene‐block‐poly(ethylene oxide) and polystyrene‐block‐poly(2‐vinylpyridine) in toluene. Starting point was the formation of a thermodynamically stable dispersion of HAuCl 4 or LiAuCl 4 in the inverse micelles of the block copolymer which were treated with hydrazine or pyrrole. Analysis of the effect of the reduction agent on the stability of the micelles yielded a simple model for the transformation process involving coagulation of the swelling micelles. Kinetic control of the different steps, i.e., reduction, mineralization, coagulation, film formation, allowed to prepare thin films in which highly uniform gold particles were arranged in yet unknown order. When pyrrole was employed for the reduction, the gold monocrystals got embedded in a shell of polypyrrole.