ABSTRACT
Hydrodynamic chromatography separates particles according to their size by passing the diluted aqueous dispersion through a column packed with nonporous spheres. Traditional chromatography has separated components soluble in the mobile phase. Sedimentation Field flow fractionation is a very useful for aggregation studies because its mass-based high resolution produces fractions that can be further characterized by electron microscopy or another suitable technique. Gas chromatography separates components of a mixture according to their volatility and interaction with a stationary phase. Gas chromatography of dispersions is performed to determine the volatile components in the dispersion or to analyze the dispersion medium. The volatile organic chemicals in dispersions, such as paints and lacquers, are usually determined by headspace analysis or by the purge-trap technique. Liquid-solid chromatography was initially performed at an atmospheric pressure until the high-performance liquid chromatography, also termed high-pressure liquid chromatography, was developed.
