Reversibly pH-Switchable Anionic-Surfactant-Based Emulsions

Reversibly pH-Switchable Anionic-Surfactant-Based Emulsions To develop a convenient and reversible strategy for phase separation and re-emulsification of surfactant-based emulsions, we established a method for pH switching of emulsions formed from a pH-switchable anionic surfactant, potassium dodecyl seleninate (C12SeO2K). Upon acidification, C12SeO2K was protonated to give a precipitate of dodecyl seleninic acid (C12SeO2H); upon basification, C12SeO2H was neutralized restore C12SeO2K. The pH-switchable window of the emulsion thus obtained was a pH range of 7 to 8. Reversible changes in both interfacial tension by ~10.2 mN m−1, as well as the mechanical, steric, and/or electrical barriers formed by C12SeO2K at the interface of the oil–aqueous solution account for the fully reversible phase separation and re-emulsification of the C12SeO2K-based emulsions. A stable emulsion (i.e. the time needed to separate 1 mL of H2O from 6 mL of emulsion at 25 °C is larger than 1 h) could be cycled at least 25 times when the pH was varied between 7 and 8. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Surfactants and Detergents Springer Journals

Reversibly pH-Switchable Anionic-Surfactant-Based Emulsions

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by AOCS
Subject
Chemistry; Industrial Chemistry/Chemical Engineering; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Surfaces and Interfaces, Thin Films; Polymer Sciences; Physical Chemistry
ISSN
1097-3958
eISSN
1558-9293
D.O.I.
10.1007/s11743-017-1981-5
Publisher site
See Article on Publisher Site

Abstract

To develop a convenient and reversible strategy for phase separation and re-emulsification of surfactant-based emulsions, we established a method for pH switching of emulsions formed from a pH-switchable anionic surfactant, potassium dodecyl seleninate (C12SeO2K). Upon acidification, C12SeO2K was protonated to give a precipitate of dodecyl seleninic acid (C12SeO2H); upon basification, C12SeO2H was neutralized restore C12SeO2K. The pH-switchable window of the emulsion thus obtained was a pH range of 7 to 8. Reversible changes in both interfacial tension by ~10.2 mN m−1, as well as the mechanical, steric, and/or electrical barriers formed by C12SeO2K at the interface of the oil–aqueous solution account for the fully reversible phase separation and re-emulsification of the C12SeO2K-based emulsions. A stable emulsion (i.e. the time needed to separate 1 mL of H2O from 6 mL of emulsion at 25 °C is larger than 1 h) could be cycled at least 25 times when the pH was varied between 7 and 8.

Journal

Journal of Surfactants and DetergentsSpringer Journals

Published: Jun 2, 2017

References

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