Amphiphilic molecules dipolar

First, it is clear that much of the complexity in surfactant phase behavior related to the existence of liquid-crystal phases, which are dominant features in water, does not exist in nonaqueous solvents [96]. The fundamental requirement for liquid-crystal formation is that one of the molecular fragments in amphiphilic molecules be highly incompatible with the solvent, and the other be highly compatible. If this severe exclusion of one part or the other is compromised in any way, the existence of liquid-crystal states (and the other characteristic features of aqueous surfactant phase behavior) is jeopardized and they may vanish altogether. This is apparent from data which show that introducing even weakly dipolar functional groups into lipophilic chains may destroy the surfactant-like aqueous phase behavior of the parent surfactant [97]. 

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