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Journal Article



Kahlweit,  M.
Abteilung Kinetik der Phasenbildung, MPI for biophysical chemistry, Max Planck Society;

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Kahlweit, M. (1988). Microemulsions. Science, 240(4852), 617-621. doi:10.1126/science.240.4852.617.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-E5DF-F
Water and oil can be made completely miscible by adding a sufficient amount of an amphiphilic compound, such as soap or a detergent. For historical reasons, such stable homogeneous solutions are called "microemulsions." In this article the term microemulsion is used in a more restrictive manner; at low concentrations of the amphiphile, mixtures of water, nonpolar solvents, and amphiphiles may separate into three coexisting liquid layers, namely, an aqueous phase, an amphiphile-rich phase, and an oil-rich phase. In the amphiphile-rich phase, which is the microemulsion in the narrower sense, one finds for thermodynamic reasons a maximum of the mutual solubility between water and oil, combined with a minimum of the interfacial tension between the aqueous and the oil-rich phase, properties that are of interest for both theory and application. The present state of art in this rapidly growing field of science is reviewed.