Studies of the Influence of Polyelectrolyte Adsorption on Some Properties of the Electrical Double Layer of ZrO2- Electrolyte Solution Interface
作者:
S. Chibowski,
M. Knipa,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 21,
issue 6
页码: 761-783
ISSN:0193-2691
年代: 2000
DOI:10.1080/01932690008913307
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
An influence of the molecular weight of the polymer and inorganic contaminations of zirconia on the adsorption and electrokinetic properties on ZrO2-electrolyte solution interface was studied. Two polymers were used; polyacrylic acid (PAA) and polyacrylamide (PAM). On the basis of the obtained dependencies, main factors responsible for observed changes of zeta potential and surface charge of washed and contaminated ZrO2were determined. It was showed, that the change of ionic structure in the Stem layer depends on the number and arrangements of-COOH groups in PAA and PAM macromolecules. These groups are responsible for the conformation of polymer chains near the surface and have direct influence on the amount of the adsorbed polyelectrolyte. The inorganic ions, present on the surface of the oxide, blocking some part of active sites, making them inaccessible for adsorbing by carboxylic groups polymer chains. That makes the adsorption on the contaminated oxide lower than on the washed one. From the comparison of the determined values of the diffuse layer charge and surface charge, the main factor influencing the zeta potential changes at different pH, molecular weight and polymer concentration was determined. Also was demonstrated, that the contaminations of the solid are reason for considerable shift of pHpzcin relation to pHicpof the zirconia. Thickness of the adsorption layers and free energies of the adsorption of polyacrylic acid and polyacrylamide on the surface of ZrO2were calculated.
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