Dispersion of SiO2-based nanocomposites with high performance liquid chromatography

The Journal of Physical Chemistry. B
Jun WangJames H Adair

Abstract

Core-shell structured Ag/SiO2 nanocomposite has been synthesized by a cyclohexane/Igepal/water reverse micelle system. The spherical nanocomposite particles were washed and concentrated with high performance liquid chromatography (HPLC) to remove the surfactant added during synthesis. Spherical SiO2 micrometer-scale particles were packed in the HPLC column as a stationary phase for the washing and dispersing of Ag/SiO2 nanocomposite particles. Surface modification of Ag/SiO2 nanocomposite particles and SiO2 microspheres with silane coupling agent enhanced the surface charge of the particles and improved the efficiency of washing with HPLC. Well-dispersed Ag/SiO2 stable suspensions were successfully attained in ethanol/water mixed solvents after HPLC washing. The state of dispersion for the Ag/SiO2 nanocomposite suspension was systematically assessed using dynamic light scattering (DLS) and transmission electron microscope (TEM) and spin coat/atomic force microscope (AFM) analyses. The mechanism of the enabling HPLC washing protocol for SiO2-based nanoparticles is discussed.

References

Sep 18, 1999·Journal of Colloid and Interface Science·K Osseo-Asare, F J Arriagada
Jan 1, 1990·The Journal of Organic Chemistry·J M HawkinsR J Saykally
Mar 29, 2005·Nano Letters·Silvina M GaticaDarrell Velegol
May 3, 1999·Angewandte Chemie·Christian BeckRolf Hempelmann

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Citations

Sep 1, 2012·Chemical Communications : Chem Comm·Min WangJie Xu
Mar 6, 2009·Nano Letters·Hari S MuddanaPeter J Butler
Apr 16, 2009·Nano Letters·D W Boukhvalov, M I Katsnelson

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