Hosseinpour S, Götz V, Peukert W (2021)
Publication Type: Journal article, Original article
Publication year: 2021
Original Authors: Saman Hosseinpour, Vanessa Götz, Wolfgang Peukert
Article Number: anie.202110091
The oil/water interface, for instance in emulsions, is often stabilized by surfactants. Hence, the co-existence of oil, water, and surfactant molecules at the buried oil/water interface determines macroscopic properties such as surface tension or emulsion stability. Utilizing an inherently surface sensitive spectroscopic method, sum frequency generation (SFG) spectroscopy, we show that adsorption of an anionic surfactant to the buried oil/water interface increases the magnitude of the interfacial electric field. Meanwhile, the degree of ordering of the interfacial oil molecules increases with the surfactant concentration due to the intercalation of aliphatic chains of interfacial oil and surfactant molecules. At sufficiently high surfactant concentrations, the interfacial charge reaches a maximum value and the interfacial oil molecules arrange in a fully ordered conformation, a state which coincides with the significant decrease in interfacial tension and increased emulsion stability.
APA:
Hosseinpour, S., Götz, V., & Peukert, W. (2021). Effect of surfactants on the molecular structure of the buried oil/water interface. Angewandte Chemie International Edition. https://dx.doi.org/10.1002/anie.202110091
MLA:
Hosseinpour, Saman, Vanessa Götz, and Wolfgang Peukert. "Effect of surfactants on the molecular structure of the buried oil/water interface." Angewandte Chemie International Edition (2021).
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