Phase Equilibria of a Mixed Alkali Soap/ Carboxylic Acid/Water System
A preliminary investigation was carried out on the phase equilibria in the three component systems, water/sodium caprylate/octanoic acid, water/sodium caprylate and sodium dodecyl sulphate (l:1) / octanoic acid at 30°C. The phases were separated by repeated centrifugation. The birefringence was ob...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
1993
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3088/1/Phase_Equilibria_of_a_Mixed_Alkali_Soap.pdf http://psasir.upm.edu.my/id/eprint/3088/ |
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| Summary: | A preliminary investigation was carried out on the phase equilibria in the three
component systems, water/sodium caprylate/octanoic acid, water/sodium caprylate and sodium dodecyl sulphate (l:1) / octanoic acid at 30°C. The phases
were separated by repeated centrifugation. The birefringence was observed under cross-polarisers and their consistency, texture and optical pattern were
examined under the polarizing microscope.
On the basis of the results obtained, a phase diagram was drawn that includes two phases of isotropic solution and two mesophases. Results also
showed a decreased amount of octanoic acid utilized in obtaining the lamellar liquid crystal phase. The critical micelle concentration was also reduced for the
mixed surfactant system |
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