The Effect of Temperature on Solubilization Phenomena

When considering the effects of temperamre changes on the solubilization process, two areas of concern must be addressed  

As has been stated often, the ability of a given surfactant to solubilize an additive is intimately related to the characteristics of the micelle (size, shape. 

TABLE 6.4. Effects of Temperature on MAC of DMAB in Several Surfactant Systems 

Changes in temperamre can affect the intermolecular interactions between solvent and solutes (e.g., hydrogen bonding), so that the overall solvent properties of the liquid for surfactant and additive may be significantly altered. 

The effect of temperature changes on the micellization of ionic surfactants is not as simple a relationship as that found for most nonionic materials, and it is to be expected that the effects on solubilization will be correspondingly more complex. It has been reported that micellar solutions of dodecylamine hydrochloride saturated with xylene passed from a clear, isotropic solution to a turbid dispersion as the temperature was increased. It was noted in Chapter 4 that many ionic surfactants pass through a minimum in cmc near room temperature it would be interesting to know whether a maximum in solubilizing power is attained in the same temperature region as the minimum in cmc. 

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