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Mineralization of Gold Nanoparticles in a Block Copolymer Microemulsion
Author(s) -
Spatz Joachim P.,
Mößmer Stefan,
Möller Martin
Publication year - 1996
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19960021213
Subject(s) - micelle , microemulsion , copolymer , chemical engineering , particle size , polystyrene , nanoparticle , colloidal gold , materials science , chemistry , polymer , polymer chemistry , nanotechnology , aqueous solution , pulmonary surfactant , organic chemistry , composite material , engineering
Controlled mineralization of gold nanoparticles has been performed in a microemulsion of polystyrene‐ block ‐poly(2‐vinylpyridine). The starting point was the formation of a thermodynamically stable dispersion of HAuCl 4 in inverse micelles of the block copolymer in toluene, which became metastable when the gold was reduced. Kinetic control of the transformation allowed the following stages of the mineralization/coagulation process to be stabilized: 1) one gold particle per micelle, 2) aggregated micelles containing two or three gold particles, and 3) a state in which empty micelles coexist with larger polymer‐stabilized gold particles. Distinctive variations in the spectra were observed depending on the particle size and whether two particles had formed a couple with orientation‐dependent dipolar interactions.