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It has been possible from studies at variable concentration of added electrolyte to obtain an average aggregation number of ca. 7 at the minimum of the size distribution curve for the case of sodium tetradecylsulfate and dodecylsulfate 1o4). It has also been demonstrated that the intermediate aggregates may have concentrations which are several orders of magnitude below those of abundant micelles. If one considers solely the consecutive equilibria, the concentration of monomer can only increase with increasing total amphiphile concentration even above the CMC.

The equations describing the thermodynamical parameters do not directly give information on the molecular nature of the hydrophobic interaction. The general nature of the effect has, however, nontrivial implications. Thus the solubilities of methane and noble gases behave according to the hydrophobic effect and there is no qualitative difference between the behavior of benzene and hexane. This indicates that the hydrophobic interaction is not primarily due to the chemical properties of the solute but rather a property of the solvent water.

3. The mean aggregation number of SDS micelles according to luminescence quenching studies plotted as a function of the NaCI concentration. 070 M. 203)) (cf. above) and suggest that the QLS method has considerable disadvantages in the absence of added salt. Another interesting method for determining micelle aggregation numbers, in which luminescence quenching provides a "count" of the number of micelles, was recently applied to SDS 203) While for the small micelles, there is agreement between different methods, the luminescence (Fig.

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