n-Octyl-�-D-glucoside and n-heptyl-�-D-thioglucoside are two green surfactants that form liquid crystalline phases in the presence of ionic liquid as well as water. A binary temperature-composition phase diagram was developed for each molecule in the ionic liquid 1-n-butyl-3-methylimidazolium tetrafluoroborate using polarized light microscopy and fluorescence spectroscopy. Prior to fluorescence spectroscopy scans across a wide range of temperatures, a small amount of the fluorescent probe prodan was added to each sample of fixed weight composition. Because the wavelength of prodan's fluorescence is dependent on the polarity of its environment, the separate phases were thus discernible. The two binary phase diagrams with the ionic liquid show considerable differences from those created from the same two surfactants in water. Most notable is the stabilization of the hexagonal phase due to p-p stacking in the ionic liquid.

Determination of the binary phase diagrams of n-octyl-β-D-glucoside and n-heptyl-β-D-thioglucoside in the ionic liquid 1-n-butyl-3-methylimidazolium tetrafluoroborate

245th National Meeting (2013)

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