On the zeta-potential of sulfonated polystyrene model colloids
Highly sulfonated polystyrene latex particles were prepared by a two-stage "shot-growth" emulsion polymerization process in the absence of emulsifier. Sodium styrene sulfonate was used as an ionic comonomer to produce latex particles with the same particle size and different surface charge densities. The conversion of electrophoretic mobility measurements into zeta-potential (ξ) data was carried out according to several theoretical approaches: Smoluchowski, O’Brien and White, and Dukhin and Semenikhin. The current electrophoretic theories give rise to a maximum in ξ-potential. Thisd behavior contradicts the classical electric double layer (e.d.l.) models which predict a continuous decrease in the electrokinetic potential. These theoretical approaches assume the absence of ionic conduction inside the shear plane. Dukhin and Semenikhin have developed an attempt to account for this phenomenon theoretically. In this work, we have calculated the ξ-potential of sulfonated polystyrene latex particles in the presence of symmetrical 1:1 and 2:2 electrolytes. The zeta-potentials estimated by the O’Brien and White (ξO-W) theory display a maximum and their values were lower than those calculated by the Dukhin and Semenikhin (ξD-S) theory, with which the maximum disappears. The considerations made by both theories about the contribution of all ions of the e.d.l. to the ionic conduction within this layer, is the reason for that differences.
Key wordsSulfonated polystyrene latexes zeta-potential
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- 8.Kim JH, Chainey M, El-Aasser MS, Vanderhoff JW (1989) J Polym Sci, Polym Chem Ed 27:3187Google Scholar
- 9.Kim JH, Chainey M, El-Aasser MS, Vanderhoff JW (1992) J Polym Sci, Polym Chem Ed 30:171Google Scholar
- 12.Bastos D, de las Nieves FJ, Colloid Polym Sci, in pressGoogle Scholar
- 17.Van der Linde AJ, Bijsterbosch BH (1990) Croatica Chim Acta 63:455Google Scholar
- 18.Overbeek JThG (1943) Kolloid Chem Beih 54:287Google Scholar
- 21.Wiersema PH (1964) Rijkuniversiteit, UtrechtGoogle Scholar
- 23.Semenikhin NM, Dukhin SS (1975) Kolloidn Zh 37:1127Google Scholar
- 26.Dukhin SS, Derjaguin BV (1974) in "Surface and Colloid Science", Ed. Matijevic E, vol 7, Wiley, New YorkGoogle Scholar
- 29.Baran AA, Dukhina LM, Soboleva NM, Chechik OS (1981)Kolloidn Zh 43:211Google Scholar
- 31.Bastos D (1992) M S These, University of Granada, SpainGoogle Scholar
- 35.Rubio-Hernández FJ, de las Nieves FJ, Bijsterbosch BH, Hidalgo-Alvarez R (1989) In: The Plastic and Rubber Institute (ed) "Polymer Latex III", p 15/1, LondonGoogle Scholar