Authors: Joachim Koetz Jennifa Baier Sabine Kosmella
Publish Date: 2007/09/12
Volume: 285, Issue: 15, Pages: 1719-1726
Abstract
The paper is focused on the formation of nanoparticles ie zinc sulfide ZnS and hydroxylapatite in a microemulsion template phase consisting of heptanol water and a surfactant with a sulfobetaine head group in the absence and presence of an added polyelectrolyte In the absence of a polyelectrolyte beside larger particles spherical ZnS nanoparticles with a diameter below 10 nm can be redispersed after solvent evaporation In the presence of the synthetic cationic polyelectrolyte polydiallyldimethylammonium chloride a reloading of the particle surface is observed and cationic charged ZnS nanoparticles of about 5 nm in size can be redispersed as a main fraction When hydroxylapatite is formed in the presence of the more stiff biopolymer chitosan hydroxylapatite hybrid structures were formed Transmission electron micrographs show fiberlike aggregate structures consisting of individual small nanoparticles ordered along the polymer chain
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