Temperature—dependent coalescence in water—oil microemulsions and phase transitions to lyotropic mesophases

Electrooptical Kerr-effect measurements in W O microemulsions (H 2O/AOT/iC 8H 18) were accomplished in order to investigate the nature of the temperature-dependent partial coalescence and its relationship to the phase-change-type transition from the microemulsion domain to lamellar water/surfactant...

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Bibliographic Details
Published in:Journal of colloid and interface science 1981, Vol.79 (1), p.151-158
Main Authors: Eicke, Hans-Friedrich, Markovic, Zora
Format: Article
Language:English
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Summary:Electrooptical Kerr-effect measurements in W O microemulsions (H 2O/AOT/iC 8H 18) were accomplished in order to investigate the nature of the temperature-dependent partial coalescence and its relationship to the phase-change-type transition from the microemulsion domain to lamellar water/surfactant structures, i.e., to lyotropic mesophases. The experimental results which confirm earlier findings from photon correlation spectroscopic measurements and other sources could be theoretically interpreted and support the following conclusions: (i) a distinct meaning can be attributed to the phase transition concept used to describe the “solubilization” curve, (ii) its location in a temperature—solubilized water diagram is definable quantitatively, and (iii) the partial molar entropy change could be determined which accompanies the phase transition in AOT containing W O microemulsions with different continuous oil phases.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(81)90058-8