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Effect of phase-volume ratio and phase-inversion on viscosity of microemulsions and liquid crystals

✍ Scribed by J. W. Falco; R. D. Walker Jr.; D. O. Shah

Publisher
American Institute of Chemical Engineers
Year
1974
Tongue
English
Weight
571 KB
Volume
20
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

Microemulsions, which are optically transparent oil‐water dispersions, were spontaneously produced upon mixing hexadecane, hexanol, potassium oleate, and water in specific proportions. The viscosity of the microemulsions was measured for several water/oil ratios including the phase‐inversion region. The striking optical and viscosity changes observed at specific water/oil ratios were in agreement with the proposed mechanism of phase‐inversion, namely, water spheres β†’ water cylinders β†’ water lammellae β†’ continuous water phase, for this system. In the phase‐inversion region, the dispersion exhibited birefringence and rheopectic properties. An extremely high viscosity (> 100,000 cps) exhibited by the dispersions between water/oil ratios of 2.0 and 3.5 were explained in terms of ion‐dipole association between oleate and hexanol molecules on adjacent droplets.

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