NDLI: Interfacial Tension; a Stabilizing Factor for Janus Emulsions of Silicone Bixa Orellana Oils

Content Provider	Springer Nature Link
Author	Leonardi, Gislaine Ricci Monteiro e Silva, Silas A. Guimarães, Carina M. Perrechil, Fabiana A. Landgraf, Richardt G. Friberg, Stig E.
Copyright Year	2016
Abstract	The destabilization process was investigated for a Janus emulsion of silicone and Bixa Orellana oils stabilized by polyoxyethylene sorbitan monooleate (Tw 80) and carboxymethyl cellulose. The emulsion stabilized with Tw 80 showed significant and fast creaming, a process that was prevented by the addition of the polymer. During the extensive coalescence of the emulsions stabilized by Tw 80, the Janus topology was retained for months of storage until, finally, separation of the oils occurred. This result strongly indicates an unexpected stabilizing action of the i nterfacial free energy. This conclusion was supported by a calculation for a realistic model system of the interfacial energy difference between two cases of coalescence. In the first case, the two coalescing Janus drops united into a larger Janus drop, while in the second case two drops formed, each with only one oil. The first case gave a spontaneous reaction (reduced interfacial energy), while the second one meant an increase of energy, i.e. it cannot happen without adding energy. The authors are aware that this stabilization is a new phenomenon in emulsion science with potential ramifications in future emulsion technology. However, it is essential to realize that the stabilization is of temporary occurrence in the destabilization process, and the free energy to give a final emulsion state with separated oils is overwhelmingly dominant. In short, Janus emulsions will, in the end, separate into layers of the liquids, like all emulsions.
Starting Page	1009
Ending Page	1014
Page Count	6
File Format	PDF
ISSN	10973958
Journal	Journal of Surfactants and Detergents
Volume Number	19
Issue Number	5
e-ISSN	15589293
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Janus emulsion Silicone oil Bixa Orellana oil Vegetable oil Stability Janus topology Creaming Coalescence Industrial Chemistry/Chemical Engineering Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Surfaces and Interfaces, Thin Films Polymer Sciences Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Physical and Theoretical Chemistry Chemical Engineering

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