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Citation: Ding Huijun, Chen Shaomo, Wang Lu, Zhao Guoxi. INTERFACE CHEMICAL PROPERTIES OF THE MIXED AQUEOUS SOLUTION OF SODIUM PERFLUOROOCTANOATE AND ALKYLTRIMETHYLAMMONIUM BROMIDE[J]. Acta Physico-Chimica Sinica, ;1988, 4(06): 629-635. doi: 10.3866/PKU.WHXB19880612 shu

INTERFACE CHEMICAL PROPERTIES OF THE MIXED AQUEOUS SOLUTION OF SODIUM PERFLUOROOCTANOATE AND ALKYLTRIMETHYLAMMONIUM BROMIDE

1.
Laboratory of Colloid Chemistry; Institute of Physical Chemistry; Peking University

Received Date: 18 May 1987
Available Online: 15 December 1988

The interface adsorption and micelle formation of the mixed solution of fluorocarbon and hydrocarbon surfactants (7CFNa and C_8NBr, C_(10)NBr, C_(12)NBr mixtures) have been investigated. The surface tension and interfacial tension of the mixed solution have been determined by the drop-volume method (the ionic strengths of the solution are kept constant in 0.1 mol~(-1)L by adding NaBr).
By applying the Gibbs adsorption equation and using nonideal solution theory, the total adsorption amount and the individual adsorption amounts of each surfactant have been obtaioned. It has been shown that (I) at the surface the adsorption rules of various systems are essentially the same. At the heptane/water interface, the adsordtion rule of 7CFNa-C_3NBr system is similar to that at the surface, for 7CFNa-C_(10)NBr mixture the amount of satuated adsorption increases with increase in the molar ratio of any one surfactant from the 1:1 ratio at which the saturated adsorption amount is the least. However, the saturated adsorption amount for 7CFNa-C_(12)NBr system decreases with decrease in the mole ratio of 7CFNa in the mixture the adsorption rule is contrary to that at the surface; (2) The surfactant mixture has a very high interfacial activity. The efficiency of surface tension decreases and the effectiveness of surface tension increases with the increase in hydrocarbon chain length in cationic surfactants.
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