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Issue 15, 2005
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Thermotropic phase behaviour of long-chain alkylmaltosides

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Abstract

The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-β-D-maltoside (C14G2) and n-hexadecyl-β-D-maltoside (C16G2) have been investigated by means of differential scanning calorimetry and X-ray techniques. Upon lyophilisation, both compounds form a solid, lamellar phase comprising disordered head groups and hexagonally packed alkyl chains that are suggested to be tilted and interdigitated. This ordered lamellar phase melts into a metastable lamellar liquid crystal, which re-crystallises to a high-temperature crystalline polymorph comprising interdigitated, non-tilted alkyl chains. Remarkably, the high-temperature polymorph of C14G2 has the same melting point as that of C16G2, namely 105 °C for both surfactants. A low-temperature polymorph of anhydrous C14G2 crystallises from water at room temperature, whereas the hemihydrate of C14G2 crystallises at 6 °C from water, or from chloroform containing trace water. X-ray data suggest both these crystalline modifications to comprise interdigitated and tilted alkyl chains.

Graphical abstract: Thermotropic phase behaviour of long-chain alkylmaltosides

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Publication details

The article was received on 25 Feb 2005, accepted on 16 Jun 2005 and first published on 04 Jul 2005


Article type: Paper
DOI: 10.1039/B502922H
Citation: Phys. Chem. Chem. Phys., 2005,7, 2970-2977
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    Thermotropic phase behaviour of long-chain alkylmaltosides

    C. A. Ericsson, L. C. Ericsson, V. Kocherbitov, O. Söderman and S. Ulvenlund, Phys. Chem. Chem. Phys., 2005, 7, 2970
    DOI: 10.1039/B502922H

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