Enhancing Solubilization in Microemulsions—State of the Art and Current Trends

  • Salager J
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ABSTRACT: Along a formulation scan, solubilization is maxi- mal when a bicontinuous microemulsion is in equilibrium with both oil and water excess phases in a so-called Winsor III sys- tem. The logical way to enhance solubilization is to increase the interaction of the surfactant for both the oil and water phases, which can be easily attained by increasing the size of both the head and tail groups. However, this approach is limited by sol- ubility constraints. Additional solubilization enhancement can be attained by introducing a molecule(s) that bridge the bulk phase and the adsorbed surfactant layer; this can be accom- plished by using the so-called lipophilic and hydrophilic “linker effect” or by using block copolymer additives. In either case, the goal is to modify an extended zone in the oil and water do- mains close to their boundary. The intramolecular grafting of a linker group between the hydrophilic and lipophilic moieties in a surfactant results in a so-called “extended” surfactant struc- ture, which produces enhanced solubilization, as does the sur- factant/linker combination, but with the added benefit that the self-contained extended surfactant structure does not undergo selective partitioning. We conclude that an improvement in sol- ubilization is directly related to the presence of a smooth, blurred, and expanded transition across the interfacial region from polar to apolar bulk phases.

Author-supplied keywords

  • Extended surfactants
  • future trends
  • interfacial t

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  • Jl Salager

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