Adsorption Processes at Solid Surfaces-Studied by Electrokinetic Investigations

Abstract

The process of electrophoretic deposition depends strongly on the electrokinetic properties and with it the surface properties of the material that will be processed. Different additives, conditioners but also the suspending liquid influence the surface of the applied material by adsorption. Electrokinetic investigations reflect changes in properties at the outermost solid surface very sensitive. Streaming potential measurements are especially suited for studying such changes of surface chemistry at solids with different shapes. Two approaches are applicable: 1. The adsorption process was done before measuring. The result of this process should be shown. In this case it will be interesting to see differences in the functionality of the solid surface. The zeta potential will be measured versus different pH value. 2. The adsorption process will be studied directly. The zeta potential will be determined versus the concentration of the adsorptive. The second approach can be used for investigation of adsorption of multicomponent mixtures. Competing adsorption processes are detectable.

Preparation and characterization of poly(l-histidine)/poly(l-glutamic acid) multilayer on silicon with nanometer-sized surface structures

“…This approach offers advantages due to better comparability of different measurements based on the independence of separation distance and is commonly used for low conductivity solutions [68].…”

Controlling of Surface Parameters of Particles Used for Electrocodeposition

“…On the other hand Celis, Fransaer and Hyashi [2,3] showed the necessity of ion adsorption for electrocodeposition of particles. In [7] we found that ion adsorption depends on the nature and charge of the particle and of the ion, ion valence, and ion concentration in competition to water and other molecules. Driving forces of adsorption are electrostatic and non-electrostatic forces.…”

“…In this paper, we show the usefulness of capillary penetration experiments and discuss some parameters that should be considered for the interpretation of the data. Ion adsorption processes, on the other hand, can be described by electrokinetic measurements [6,7].…”