Photoresponsive Surfactants for Controllable and Reversible Emulsion Systems

Journal article


Xue, H., Han, Y., Liu, G., Chen, W., Wang, Z. and Wang, N. 2024. Photoresponsive Surfactants for Controllable and Reversible Emulsion Systems. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 705 (1), pp. 1-9. https://doi.org/10.1016/j.colsurfa.2024.135669
AuthorsXue, H., Han, Y., Liu, G., Chen, W., Wang, Z. and Wang, N.
Abstract

Surfactants play a crucial role in applications such as oil-water separation, foam flotation, drug delivery, emulsion polymerization, and emulsifier recovery. Stimulus-responsive surfactants, as innovative smart materials, can reversibly control emulsion decomposition or phase transformation, facilitating emulsion circulation and component recovery. In this paper, two short-chain fluoroazobenzene photoresponsive surfactants (FADC-2 and FADC-4) were synthesized. Three different reversible emulsion systems were constructed, leveraging the excellent chemical stability and rapid photoresponse of azobenzene and the trifluoromethyl group as a hydrophobic moiety. The results indicate that under different light exposures, the FADC-2/n-hexane/water and FADC-4/n-hexane/water emulsions exhibit reversible emulsification and demulsification cycles, while the FADC-4/n-octanol/water emulsions show reversible phase transfer. These findings highlight the effectiveness of photoresponsive surfactants in controlled emulsion systems, offering promising applications in fields requiring precise emulsion manipulation and liquid-liquid phase transfer, at the same time advancing the development of environmentally friendly, practical, durable, and stimulus-responsive surfactants.

KeywordsPhotoswitches; Azobenzene; Photoresponsive surfactant; Emulsion breaking
Year2024
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Journal citation705 (1), pp. 1-9
PublisherElsevier
ISSN1873-4359
Digital Object Identifier (DOI)https://doi.org/10.1016/j.colsurfa.2024.135669
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0927775724025330
Accepted author manuscript
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Output statusPublished
Publication dates
Online29 Oct 2024
Publication process dates
Accepted28 Oct 2024
Deposited04 Dec 2024
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