An Introduction to Surfactants by Tharwat F. Tadros PDF

By Tharwat F. Tadros

ISBN-10: 3110312123

ISBN-13: 9783110312126

Surfactants are floor lively brokers, molecules that experience an important function in emulsions, suspensions, and foams. They locate frequent program in own care, cosmetics, prescribed drugs, agrochemicals and the nutrients undefined. Their category, actual houses, part habit, their results and purposes are coated during this e-book.

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The value of Ł1 depends on surfactant concentration, chain length and temperature. e. the residence time increases with increasing chain length. The above discussion emphasizes the dynamic nature of micelles and it is important to realize that these molecules are in continuous motion and that there is a constant interchange between micelles and solution. 1 Thermodynamics of micellization | 37 the counterions which exchange rapidly with lifetimes in the range 10−9 –10−8 s. Furthermore, the counterions appear to be laterally mobile and not to be associated with (single) specific groups on the micelle surfaces.

24] A. J. J. Straathof and P. ) Applied Biocatalysis, Harwood Academic, Amsterdam, 2000. [25] Th. Tadros, in: Novel Surfactants, K. ), Chapter 16, Marcel Dekker, New York, 2003. [26] B. Lindman, in: Surfactants, Th. F. ), Academic Press, London, New York (1984). K. Holmberg, B. Jonsson, B. Kronberg and B. , USA, 2003. 3 Aggregation of surfactants, self-assembly structures, liquid crystalline phases The physical properties of surface active agent solutions differ from those of nonamphipathic molecule solutions (such as sugars) in one major aspect, namely the abrupt changes in their properties above a critical concentration [1].

1. Variation of solution properties with surfactant concentration. 30 | 3 Aggregation of surfactants, self-assembly structures, liquid crystalline phases 1 nm Fig. 2. Illustration of a spherical micelle for dodecyl sulfate [2]. ever, other techniques such as self-diffusion measurements, NMR and fluorescence spectroscopy can be applied. A compilation of cmc values was given in 1971 by Mukerjee and Mysels [3], which is clearly not an uptodate text, but is an extremely valuable reference. 1, to show some of the general trends [3].

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An Introduction to Surfactants by Tharwat F. Tadros

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