Phase transition in concentrated latices and the electrical double layer on their surfaces.

概要

論文の詳細を見る
The phase diagrams of monodisperse latices were constructed under the various conditions. The variable of the phase diagrams, the particle size, the surface charge densities of the latices, the counter-ion valences, and the medium temperature were taken up. The results, especially, the coexistent/ordered boundary curves were analysed in terms of the closed packing of the effective particle volumes which consisted of the latex particles which were surrounded by the electrical double layer. The value of 1.5 <I>kT</I> ergs of electrical repulsion, when used as a criterion in the DLVO potential to back-calculate the weight fraction of solid contents as a function of KCl concentration, yields a curve that is very similar to the experimental boundary curve. The same agreement was found in the curves mapped out for the other latices with a different particle size and a different surface charge density using KCl as an electrolyte. In the boundary curve constructed using MgCl<SUB>2</SUB>, however, the agreement with the analyses was not enough where the divalent cation would be adsorbed preferentially on their surfaces as a Stern layer charge. The temperature effect could be reasonably explained by the same procedure.
公益社団法人日本化学会の論文