Theoretical and experimental study of the surface charge density and the surface potential of coal—water suspensions in dissymmetrical electrolytes

Author(s):  
Tayssir Hamieh ◽  
Bernard Siffert
1982 ◽  
Vol 60 (1) ◽  
pp. 42-48 ◽  
Author(s):  
G. Roy ◽  
Y. Okada ◽  
R. Laprade

The adsorption of Br-X537A and its effect on the surface potential of monoolein lipid bilayers was measured using the nonactin conductance as a probe to determine the surface charge density. Because of the pH dependence of this adsorption, it was concluded that not only the negatively charged molecules X− could induce a surface charge but also a dimer HX2− made from X− and the neutral molecule HX. Also an important bilayer conductance was induced by Br-X537A. From the Br-X537A concentration dependence of this conductance, the effect of pH, and the induced surface potential, it was found that two charged complexes are transported across the bilayer depending on pH. At pH ≥ 7 the conducting molecule is X− and at pH ≤ 5 the complex is H2X3−. A quantitive model is obtained to calculate both the induced surface potential and the conductance.


1999 ◽  
Vol 48 (12) ◽  
pp. 1371-1376,1417 ◽  
Author(s):  
Shoko YOKOYAMA ◽  
Yoshihiro FUJINO ◽  
Tadahiro TAKEDA ◽  
Masahiko ABE

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