Lyotropic Phase Behaviour and Structural Parameters of Monosaccharide and Disaccharide Guerbet Branched-Chain β-D-Glycosides

Abstract:

The phase behaviour and self-assembly structural parameters of a pair of monosaccharide and disaccharide Guerbet branched-chain β-D-glycosides, namely 2-octyldodecyl β-D-glucoside (β-Glc-C₁₂C₈) and 2-octyldodecyl β-D-maltoside (β-Mal-C₁₂C₈), have been studied by means of optical polarizing microscopy (OPM) and small-angle X-ray diffraction at room temperature (25°C). These compounds are sugar-based glycolipid surfactants having a total chain length of C20, and differ based on the increasing number of hydroxyl groups of the sugar headgroup (glucose and maltose). The repeat spacings obtained by X-ray diffraction as a function of water content have been used to determine the limiting hydration for the two glycosides. At room temperature, β-Glc-C₁₂C₈ and β-Mal-C₁₂C₈ have limiting hydrations of 22 wt% and 25 wt%, corresponding to 8 10 and 10 12 water molecules per glycoside, respectively. At all water contents between 5 and 29 wt % water, these compounds adopt inverse hexagonal (H_II) or fluid lamellar (L_α) phases. The structural parameters of these phases have been determined from the diffraction data, from the X-ray repeat spacings, densities and concentration of the glycosides.

• Periodical: Advanced Materials Research (Volume 895)
• Pages: 111-115
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.895.111
• Online since: February 2014
• Authors: Hairul A.A. Hamid, Rauzah Hashim, John M. Seddon, Nicholas J. Brooks
• Keywords: Inverse Hexagonal Phase, Lamellar Phase, Lyotropic Phase Behaviour

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