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By Kozo Shinoda

ISBN-10: 1483229238

ISBN-13: 9781483229232

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Extra info for Colloidal Surfactants. Some Physicochemical Properties

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52) from Eq. 35), where Z is the number of charges of the gegenions, and d is the concentration of gegenions. 54) 1. THE FORMATION OF MICELLES 57 Lelong's (254) results agree well with this theoretical relation. 11. Kinds of Univalent Gegenions The CMC is not markedly dependent on the nature of the gegenions (255). Since the electrical energy for micellization is determined mainly by the concentration, the nature of the gegenion exerts only a secondary effect. 17. 0115 (223) (223) (223) (223) (223) (256) (226) 25,30 (223,258) 25,30 (223,258) 30 60 60 25 25 25 25 25 25 40 25,40 40 40 25 (258) (226) (226) (257) (257) (257) (257) (257) (91) (259) (31,259) (259) {265a) (91) 12.

The change in CMC as a function of the paraffin chain length may be expressed as lnC = — rno) + const kT Actually, the CMC of nonionic agents or the solubility of chain alcohols (231) decreases about one-third for each additional lène group (4, 232). 44') paraffin méthyagents KOZO SHINODA 44 under the condition of a definite concentration of gegenions (215). As the electrical work per micelle-forming ion is almost equal under this condition, the relation between the CMC and paraffin chain length of ionic agents is also expressed by the same equation.

44, 178). The aggregation number of most micelles, 30~2000, is not quite large enough to treat the micelle as a phase, though it seems adequate to call it a pseudophase (14). To what extent then does the micelle formation show an abrupt change? Bury and collaborators (6, 179) showed that a fairly abrupt transition was to be expected from the application of the mass law to the equilibrium between single species and micelles composed of a fairly large number of monomers. However, the most serious limitation upon the validity of the theory of micelle formation, and the most frequent cause of misunderstanding, has been the neglect of the activity coefficients, which have usually been taken as unity throughout.

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Colloidal Surfactants. Some Physicochemical Properties by Kozo Shinoda

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