Collect. Czech. Chem. Commun. 1996, 61, 819-824

Experimental Evidence of the Isoperichoric Focusing of Nanosize Polyaniline Particles in Density Gradient Formed by Colloidal Silica

Josef Janča and Milena Špírková

Université de La Rochelle, Pôle Sciences et Technologie, Avenue Marillac, 17042 La Rochelle Cedex 01, France


The isoperichoric focusing transport phenomena were recently described by a rigorous theoretical model. Contrary to the generally accepted supposition that a density gradient forming liquid in isopycnic focusing should behave as continuum regarding the focused species, the model predicts the focusing with no a priori imposed size ratio of the focused to the density gradient forming species. This prediction was evidenced by focusing of the polyaniline nanosize particles in a density gradient formed by colloidal silica particles suspended in water. The size ratio of the polyaniline to silica particles was low.

Keywords: Thin-layer isopycnic focusing of polyaniline; Colloidal silica density gradient.