Our earlier studies found FC-HC hybrid surfactants FC6-HCn having a perfluorohexyl chain and a hydrocarbon chain (n: hydrocarbon length) to be not only a super-efficient water solubilizer but also a CO2-thickener by formation of rod-like reverse micelles (RRMs) in scCO2. Aiming at exploring a lower fluorine content surfactant to be a more practical CO2-thickner, this study examine formation of RRMs of the double C2F5-tail surfactant 2FG(EO)2 and tuning its micelle morphology by water content, pressure and UV-light irradiation with a photochromic dye 1,3,3-trimethylindolino-6'-nitrobenzopyrylospiran (SP). The 50mM surfactant/7mM SP/D2O/CO2 mixtures at 45 °C and 350 bar displayed SANS profiles for RRMs at water-to-surfactant molar ratio (W0) = 5-10 and for lamellar liquid crystals with Bragg peaks with W0 = 20. With decreasing pressure from 350 bar to 200 bar, those SANS profiles for the molecular assemblies disappeared due to formation of a W/C macroemulsion or precipitation of the surfactant. By fitting theoretical curves of cylindrical particles to the SANS data, length of RRMs was found to increase from 65 Å to 432 Å with loading water from W0 = 5 to 10, although the radius was almost same at 10.4-10.5 Å. UV-light irradiation at the wavelength 365 nm for 3 min also decrease RRMs length at W0 = 10 by 36 Å due to photoisomerization of SP.

Tuning morphology of low fluorine-content reverse micelles in supercritical carbon dioxide by pressure, water content, and UV-light irradiation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.