Colloid and Polymer Science

, Volume 269, Issue 1, pp 85–90

The effect of particle concentration on zeta potential in extremely dilute solutions

  • K. B. Medrzycka
Colloid Science

DOI: 10.1007/BF00654663

Cite this article as:
Medrzycka, K.B. Colloid Polym Sci (1991) 269: 85. doi:10.1007/BF00654663


The electroporetic mobility of hexadecane particles in water and in very dilute CTAB solutions was measured. The technique of microelectrophoresis was applied. Zeta potential was calculated according to the Hückel formula, applying Henry's correction factors. Electrokinetic charge density was calculated according to the formula used by Delgado et al., and previously discovered empiricaly by Loeb et al. and derived mathematicaly by Ohshima et al. It was found that the particle concentration in emulsion limits their charge in solutions of very low ion concentration (10−7:10−6 M), because the greater the particle concentration, the smaller the extent of the ions adsorbed at the surface of one particle. The zeta potential was found to be independent of particle concentration if the ratio of the number of bulk ions to particle number is not lower than 1.6×106. This ratio depends on particle size, and the value 1.6×106 relates to particles of diameter 1.6 μm.

Key words

Zeta potential,emulsion particleconcentration cetyltrimethylammoniumbromide (CTAB) 

Copyright information

© Steinkopff-Verlag 1991

Authors and Affiliations

  • K. B. Medrzycka
    • 1
  1. 1.Institute of Organic and Food Chemistry and TechnologyTechnical University of GdańskGdańskPoland

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