Phase diagram and physiochemical properties of the n-octyl a D-glucoside/water system

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Phase diagram and physiochemical properties of the n-octyl a D-glucoside/water system

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Publication Article, peer reviewed scientific
Title Phase diagram and physiochemical properties of the n-octyl a D-glucoside/water system
Author(s) Kocherbitov, V ; Söderman, Olle
Date 2003
English abstract
Four experimental methods were used to study the phase diagram, as well as the thermodynamic and structural properties of the binary system n-octyl -D-glucoside/water in the temperature range 25-130°C. Sorption calorimetry allows one to determine the activity of water and enthalpy of mixing as functions of water content at constant temperature, while DSC scans temperature at constant composition and provides information on enthalpies of phase transitions. Therefore, the combination of the two calorimetric methods is a powerful tool to study composition-temperature phase diagrams. While calorimetry can be used to determine boundaries of the phases, NMR and SAXS methods are used to study their structures. A detailed phase diagram of the system is presented. A liquid crystalline cubic phase previously not reported in the system was found. The hydration in the system is endothermic, excluding the exothermic formation of hydrates. Using the sorption calorimetric method the lengths of the very short tie lines between the isotropic micellar and liquid crystalline phases were determined. Van der Waalss differential equation was used to calculate the slopes of the phase boundaries. The parameters of the lamellar, cubic and hexagonal liquid crystalline phases were determined by means of SAXS. It was found that the area per surfactant headgroup in the liquid crystalline phases varied with composition.
Publisher Royal Society of Chemistry
Host/Issue Physical chemistry chemical physics;23
Volume 5
ISSN 1463-9084
Pages 5262-5270
Language eng (iso)
Handle http://hdl.handle.net/2043/647 (link to this page)

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