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The Effect of Cationic Electrolytes on the Electrostatic Force Between Two Dissimilar Ionizable Surfaces

  • You-Im Chang

Abstract

It is widely recognized that the electrostatic interaction is one of the most important forces (including long-range, short-range and hydrodynamic forces) in promoting or inhibiting adhesion of the colloidal particles in many technological processes such as filtration, paper-making, wastewater clarification and clay migration in oil reservoir. Usually, the effects of electrostatic force on colloidal adhesion follow the rule given by the DLVO theory1. The basic principle of the DLVO theory is that the total interaction energy between two interacting colloidal particles is the sum of the electrostatic repulsive energy and the van der Waals attractive energy. The magnitude of the electrostatic energy depends on the thickness of the electrical double layer and the surface potentials of the interacting particles. In calculating the electrostatic force, it always assumes that the two interacting surfaces are fixed either with constant potential or with constant charge2,3. However, in dealing with the adhesion of colloidal particles bearing with ionizable surface groups, it was pointed out that, for the purpose of minimizing the total interaction free energy, the particles will regulate their surface charges or potentials so that the interacting surfaces can maintain at ionicequilibrium with the bulk solution. Hence, neither the particle potential nor the particle charge remains constant during the period of adhesion 4,5,6,7,8,9. Recently, based on the above charge regulation model, the author 10,11 examined the effect of the presence of multivalent cations on the electrostatic force between a particle bearing with ionogenic groups and a collector with either constant potential or constant charge.

Keywords

Divalent Cation Electrostatic Force Separation Distance Repulsion Force Suspension Medium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Reference

  1. 1.
    E.J.W. Verwey and J.Th.G. Overbeek, “Theory of the stability of lyophobic colloids,” Elserier pub Amsterdam (1948).Google Scholar
  2. 2.
    R. Hogg, T.W. Healy, and D.W. Fuerstenaue, Mutual coagulation of colloidal dispersions, Trans. Faraday Soc. 62:1638 (1966)CrossRefGoogle Scholar
  3. 3.
    G.R. Wiese, R.O. James, and T.W. Healy, Discreteness of charge and solvationCrossRefGoogle Scholar
  4. 4.
    B.W. Ninham and V.A. Parsegian, Electrostatic potential between surfaces bearing ionizable groups in ionic equilibrium with physiologic saline solution, J. Thero. Biol 31: 405 (1971)CrossRefGoogle Scholar
  5. 5.
    D.C. Prieve and E. Ruckenstein, Role of surface chemistry in particle deposition, J. Colloid and Interface Sci. 60:337 (1977).CrossRefGoogle Scholar
  6. 6.
    D.C. Prieve and E. Ruckenstein, The double-layer interaction between dissimilar ionizable surfaces and its effect on the rate of deposition, J. Colloid and Interface Sci. 63:317 (1978).CrossRefGoogle Scholar
  7. 7.
    D. Chan, J.W. Perram, White, and T.W. Healy, Regulation of surface potential at amphoteric surfaces during particle interaction, J.C.S. Faraday I 71:1046 (1975).CrossRefGoogle Scholar
  8. 8.
    D. Chan, T.W. Healy and L. R. White, Electrical double layer interactions under regulation by surface ionization equilibria-Dissimilar amphoteric surfaces. J.C.S. Faraday I. 72:2844 (1976).Google Scholar
  9. 9.
    T.W. Healy, D. Chen, and L.R. White, Colloidal behavior of materials with ionizable group surface, Pure Appl. Chem. 52:1207 (1980).CrossRefGoogle Scholar
  10. 10.
    Y.I. Chang, The effect of cationic electrolytes on the electrostatic behavior o f cellular surface with ionizable groups, J. Thero. Biol. 139:561 (1989).CrossRefGoogle Scholar
  11. 11.
    Y.I. Chang, Divalent cations can increase cell-substrate repulsion at small distances Colloids and Surfaces 41:245 (1989).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • You-Im Chang
    • 1
  1. 1.Dept. of Chemical EngineeringTunghai UniversityTaichungTaiwan

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