Chemistry, Physics and Technology of Surface, 2012, 3 (4), 463-472.

pH Influence on Adsorption Behavior, Surface Dilational Rheology and Foam Stability of Mixed Sodium Humates / Cetyltrimethylammonium Bromide Solutions



G. I. Kovtun, S. L. Khil'ko

Abstract


The results of the ring and the oscillating drop shape methods investigation of adsorption and surface rheological characteristics of natural polyelectrolytes–sodium humates solutions with additives of cetyltrimethylammonium bromide (CTAB) at a liquid–gas interface at different pH values are presented. The main features of concentration dependences of surface tension and visco-elasticity modulus for mixed sodium humates / CTAB solutions may be connected with the aggregate formation in the adsorption layer at appropriate CTAB concentrations. The possibility of foam formation from sodium humates / CTAB mixed solutions is studied. It was shown that pH reduction leads to an increase of foam stability.

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