Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 256, Issue 1, Pages 17-20Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2004.09.036
Keywords
phase transfer; gold nanoparticle; surfactant
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Gold nanoparticles synthesized in aqueous phase were modified by thioglycolic acid (TGA) and then capped with cetyltrimethyl ammonium bromide (C(16)TAB), myristyltrimethyl ammonium bromide (C(14)TAB), and dodecyltrimethyl ammonium bromide (C(12)TAB), respectively. The surfactant capped nanoparticles could be transferred into toluene without aggregation across the water/toluene interface under vigorous stirring. The transfer process was certified by the rapid change of color of the aqueous and organic phase, zeta potential of nanoparticles, and UV-vis absorbance spectroscopy. Experimentally, it is found that only decyltrimethyl ammonium bromide (C(10)TAB) capped nanoparticles were unable to ensure the phase transfer in the organic phase. Both transmission electron microscopy (TEM) images and static light scattering measurement demonstrated the narrow size distribution of the capped nanoparticles in toluene. (c) 2004 Elsevier B.V. All rights reserved.
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