A microemulsion is a thermodynamically stable mixture of immiscible fluids and surfactant with structure on a mesoscopic length scale. In a gradient theory, a negative square-gradient coefficient stabilized by a positive fourth-gradient term favors fluctuations at nonzero wavevector.
A microemulsion is a type of thermodynamically stable dispersion of two immiscible liquids, typically oil and water, which is stabilized by surfactants (surface-active agents). Unlike ordinary emulsions, which can separate over time, microemulsions remain stable and are characterized by their small droplet sizes, typically in the range of 10 to 100 nanometers.
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