Journal
CARBOHYDRATE RESEARCH
Volume 345, Issue 17, Pages 2534-2541Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2010.08.004
Keywords
Octyl beta-D-glucoside (C8Glu); Octyl beta-D-thioglucoside (C8SGlu); Glass transition temperature (T-g); Differential scanning calorimetry (DSC); Couchman-Karasz equation (C-K equation); Molar heat capacity change (Delta C-p)
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The lyotropic behavior and glass-forming properties of octyl beta-D-glucoside (C8Glu) and octyl beta-D-thioglucoside (C8SGlu)/water binary mixtures were evaluated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The results clearly indicate that the mixture forms a glass in the supercooling state of liquid crystalline phases such as cubic, lamellar, and smectic. The glass transition temperature (T-g) of the mixture was strongly dependent on solute concentration, with a higher concentration correlating with a higher T-g. The experimental T-g was consistent with the predicted value calculated using the Couchman-Karasz equation in both the C8Glu and C8SGlu/water mixtures. The change of heat capacity at T-g showed the two bending points under variation of concentrations. And the highest temperature of phase transition from lamellar to isotropic solution was observed at around 50% molar concentration. It was expected that non-percolated state of water existed in extremely higher concentration ranges. (C) 2010 Elsevier Ltd. All rights reserved.
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