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- W967229838 abstract "Fatty acids are natural, pH-responsive surfactants. Their properties can be tuned by adding CO2 or by applying light which modify solution pH. We investigated photoresponsive systems based on fatty acids with different chain lengths in the presence of a photoacid generator (PAG). Under UV irradiation, photolysis of the PAG in aqueous solution resulted in a decrease in pH, triggering a change in fatty acid assembly. Using a multi-scale approach before and after UV irradiation, we characterized the effect of this pH decrease on the nature of the fatty acid self-assemblies. At the molecular scale, pH and infrared spectroscopy measurements were used to determine the fatty acid ionization state. At the microscopic scale, the self-assembled structure was characterized using small-angle neutron scattering and microscopy. We showed that UV irradiation tuned the ionization state of the fatty acid molecules which in turn triggered a transition from spherical micelles to vesicles or lamellar phases, depending on fatty acid chain length. We studied the foaming properties of these systems before and after UV irradiation. We showed that after UV irradiation, foam stability was drastically enhanced as a result of a change in self-assembly. Our approach can be easily extended to various pH-responsive surfactants." @default.
- W967229838 created "2016-06-24" @default.
- W967229838 creator A5031176900 @default.
- W967229838 creator A5053991344 @default.
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- W967229838 date "2015-11-01" @default.
- W967229838 modified "2023-10-03" @default.
- W967229838 title "pH-responsive fatty acid self-assembly transition induced by UV light" @default.
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- W967229838 doi "https://doi.org/10.1016/j.jcis.2015.07.043" @default.
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