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Structure Effect on Miscibility of Butanol and Dodecyltrimethylammonium Chloride in Adsorbed Film

โœ Scribed by Masumi Villeneuve; Norihiro Ikeda; Kinsi Motomura; Makoto Aratono

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
140 KB
Volume
204
Category
Article
ISSN
0021-9797

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โœฆ Synopsis

Miscibility of components in the adsorbed film for the n-butanol (NBA)-dodecyltrimethylammonium chloride (DTAC) and tertbutyl alcohol (TBA)-DTAC mixtures were investigated by measuring surface tension of the aqueous solutions. The experimental results were analyzed thermodynamically. Diagrams of the excess Gibbs energy in the adsorbed film g ห†H,E vs the composition in the adsorbed film X ห†2 H were obtained from the phase diagrams of adsorption. The g ห†H,E values of the NBA-DTAC system are more negative than those of the TBA-DTAC system. It is concluded that the molecular interaction between NBA and DTAC is stronger than that between TBA and DTAC. With respect to the mean molar area in the adsorbed film A vs X ห†2 H curve at a fixed surface tension โฅ, the criterion of ideal mixing is demonstrated to be a straight line connecting the pure values. The A vs X ห†2 H curves are convex downward in both systems and the deviation from the straight line is attributed to the dependence of g ห†H,E on โฅ.

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