Influence of the ionic strength in the heterocoagulation process between bare and surfactant-coated latexes |
| |
Authors: | J A Maroto F J de las Nieves |
| |
Institution: | (1) Department of Applied Physics University of Jaén E-23700 Linares, Jaén, Spain, ES;(2) Group of Complex Fluids Physics Department of Applied Physics University of Almería E-04120 Almería, Spain, ES |
| |
Abstract: | A novel and useful process of heterocoagulation between bare and surfactant-coated latexes is studied. Basically, this process
consists of the heterocoagulation of two identical latexes, i.e. of the same size and with charges of the same sign, but distinguished
by the degree of coverage by a nonionic surfactant (Triton X-100). The different critical coagulation concentrations (ccc)
of this type of sample permitted us to analyze the influence of the ionic strength in the heterocoagulation process between
both colloidal samples. Different ratios (2:1, 1:1 and 1:2) of the bare and surfactant-coated latexes were used during the
experiments. In all cases, the heterocoagulation rate constants were lower than the homocoagulation rate constant in diffusion
conditions; however, for an ionic strength higher than the ccc of both systems, similar values were found for the rate constants.
Received: 18 January 1999 Accepted in revised form: 14 April 1999 |
| |
Keywords: | Colloidal aggregation Heterocoagulation Nonionic surfactant Latex |
本文献已被 SpringerLink 等数据库收录! |
|