TY - JOUR
T1 - Effect of capillary waves on the double layer capacitance of the interface between two immiscible electrolytes
AU - Daikhin, L. I.
AU - Kornyshev, A. A.
AU - Urbakh, M.
N1 - Funding Information:
The authors are grateful to Sasha Volkov and to Zdenec Samec for useful discussions. The financial support of this work by DAAD is greatly appreciated.
PY - 1999/11/1
Y1 - 1999/11/1
N2 - The effect of capillary waves on the double layer capacitance of the interface between two immiscible electrolytes has been studied. We have found that a corrugation of the interface due to capillary waves leads to an increase in the capacitance, as compared with the Gouy-Chapman result for a flat interface. The theory offers a concept of a roughness function, R, which determines the deviation of capacitance from the Gouy-Chapman result. R is a function of Debye lengths of the two immiscible electrolytes. Analytical expression for the roughness function has been derived which shows a strong dependence of R on the interfacial tension and the dielectric constants of contacting solutions. Predictions amenable to experimental tests have been discussed.
AB - The effect of capillary waves on the double layer capacitance of the interface between two immiscible electrolytes has been studied. We have found that a corrugation of the interface due to capillary waves leads to an increase in the capacitance, as compared with the Gouy-Chapman result for a flat interface. The theory offers a concept of a roughness function, R, which determines the deviation of capacitance from the Gouy-Chapman result. R is a function of Debye lengths of the two immiscible electrolytes. Analytical expression for the roughness function has been derived which shows a strong dependence of R on the interfacial tension and the dielectric constants of contacting solutions. Predictions amenable to experimental tests have been discussed.
UR - http://www.scopus.com/inward/record.url?scp=0033220819&partnerID=8YFLogxK
U2 - 10.1016/S0013-4686(99)00247-9
DO - 10.1016/S0013-4686(99)00247-9
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AN - SCOPUS:0033220819
SN - 0013-4686
VL - 45
SP - 685
EP - 690
JO - Electrochimica Acta
JF - Electrochimica Acta
IS - 4-5
T2 - Proceedings of the 1998 Portucalensis Conference on Electrified Interfaces
Y2 - 5 July 1998 through 10 July 1998
ER -