Solution Behavior of Surfactants: Theoretical and Applied by Björn Lindman, Håkan Wennerström (auth.), K. L. Mittal, E.

By Björn Lindman, Håkan Wennerström (auth.), K. L. Mittal, E. J. Fendler (eds.)

This and its significant other quantity 2 contain the lawsuits of the overseas Symposium on "Solution habit of Surfactants - Theoretical and utilized facets" geared up below the auspices of the eleventh Northeast neighborhood assembly of the yank Chemical Soci­ ety held in Potsdam, N. Y. , June 30-July three, 1980. This Symposium re­ offered the 3rd occasion within the sequence of symposia facing the subject of surfactants in answer. the 1st Symposium was once held in Albany, N. Y. , in 1976 below the name "Micellization, Solubili­ zation and Microemulsions", 1 the complaints of which were document­ umented in a two-volume set • the second one was once held less than the name "~olution Chemistry of Surfactants" in 1978 in Knoxville, TN, an~ the complaints of this occasion have additionally been accurately chronicled • Apropos, the fourth biennial Symposium in, this sequence is entitled "International Symposium on Surfactants in answer" (K. L. Mittal and B. Lindman, Cochairmen) and is scheduled to be held from June 27 to July 2, 1982 in Lund, Sweden. on the grounds that those biennial occasions were very profitable and critical in bringing researchers with assorted pursuits jointly and in stimulating interdisciplinary verbal exchange, so the plans are to proceed those usually with a transformation in venue for every meeting.

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14, 1 (1959). C. Tanford, "The Hydrophobic Effect: Formation of Micelles and Biological Membranes," 1st edition, John Wiley, New York, 1973; and references cited therein. C. Tanford, "The Hydrophobic Effect: Formation of Micelles and Biological Membranes," 2nd edition, John Wiley, New York, 1980; and references cited therein. A. Ben-Naim, "Hydrophobic Interactions," Plenum Press, New York, 1980; and references cited therein. J. Wi1f and A. Ben-Naim, J. Phys. Chem. 83, 3209 (1979). PRESSURE STUDY ON SURFACTANT SOLUTIONS M.

It is felt that such studies will lead to a better understanding of the complex factors involved in micelle formation or association. In this paper pressure studies on surfactant solutions as mentioned above will be overviewed. 1. 1 THE BEHAVIOR OF IONIC SURFACTANT SOLUTIONS UNDER HIGH PRESSURE The Effect of Pressure on the Solubility of Ionic Surfactants in Water With respect to the effect of pressure on the solubility, which is one of the most important characteristics of surfactants. Hamann observed that the solubility of dodecylamine hydrochloride 43 PRESSURE STUDY ON SURFACTANT SOLUTIONS decreased with increasing pressure1 • We determined in more detail the solubilities of sodium dodecy1su1fate (SDS) and dodecy1amine bromide (DAB) by measuring the electric conductivity at pressure up to 3,000 atm and at several temperatures in the range 7 to 35°C 2 (See Figure 1).

49 PRESSURE STUDY ON SURFACTANT SOLUTIONS Figure 7 shows plots of the logarithm of the CMC versus the logarithm of the concentration of counterion to be linear, as well as those for SDS. Thus the following familiar relation is found to hold for the system of DTAB-KBr under high pressure. log CMC = - a log ( CMC + xs )+ const. ( T,P ), (1) where Xs is the concentration of KBr, and a is the degree of counterion association. The values of a, the slope in Figure 7, which were determined by the least-square method, are shown in Figure 8 as a function of pressure.

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