Bending Moduli of CO2 Containing Surfactants in Oil-in-Water (O/W) Microemulsions
Aim of this proposal is to determine the bending moduli of the monolayer of nonionic surfactants containing different amounts of CO2 in their hydrophilic head group at the oil/water interface. This will be done by a combination of NSE and SANS on oil-in-water (O/W) microemulsions in D2O that are saturated with d22-decane in order to have a film contrast. Under these conditions combining NSE and SANS allows uniquely to determine both mean and saddle-splay modulus. This is very interesting as the CO2 containing surfactants deviate systematically from the conventional EO surfactants with respect to their phase behaviour but also with respect to the solubilisation properties. With increasing CO2 content in the head group the solubilisation capacity is largely enhanced. According to standard theory this should be reflected in correspondingly changed values of the bending moduli. However, so far no experimental evidence exist and NSE and SANS will allow to obtain such information much more directly and with a much higher precision, than possible with any other method. Such information will be essential to enable optimised formulations with these novel surfactants.
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GRADZIELSKI Michael; HOFFMANN Ingo; MARSCHALL Rahel; PREVOST Sylvain and Vivian J. Spiering. (2020). Bending Moduli of CO2 Containing Surfactants in Oil-in-Water (O/W) Microemulsions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1615
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