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Thermotropic phase behaviour of long-chain alkylmaltosides

Ericsson, Caroline LU ; Ericsson, Louise C; Kocherbitov, Vitaly LU ; Söderman, Olle LU and Ulvenlund, Stefan LU (2005) In Physical Chemistry Chemical Physics 7(15). p.2970-2977
Abstract
The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-beta-D-maltoside (C(14)G(2)) and n-hexadecyl-beta-D-maltoside (C(16)G(2)) 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 C(14)G(2) has the same melting point as that of... (More)
The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-beta-D-maltoside (C(14)G(2)) and n-hexadecyl-beta-D-maltoside (C(16)G(2)) 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 C(14)G(2) has the same melting point as that of C(16)G(2), namely 105 degrees C for both surfactants. A low-temperature polymorph of anhydrous C(14)G(2) crystallises from water at room temperature, whereas the hemihydrate of C(14)G(2) crystallises at 6 degrees C from water, or from chloroform containing trace water. X-ray data suggest both these crystalline modifications to comprise interdigitated and tilted alkyl chains. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
7
issue
15
pages
2970 - 2977
publisher
Royal Society of Chemistry
external identifiers
  • pmid:16189619
  • wos:000230596900035
  • scopus:23844452366
ISSN
1463-9084
DOI
10.1039/b502922h
language
English
LU publication?
yes
id
831df8c1-9219-4b43-bc4a-2edb75c59e70 (old id 157340)
date added to LUP
2007-07-11 11:17:31
date last changed
2017-07-30 04:28:25
@article{831df8c1-9219-4b43-bc4a-2edb75c59e70,
  abstract     = {The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-beta-D-maltoside (C(14)G(2)) and n-hexadecyl-beta-D-maltoside (C(16)G(2)) 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 C(14)G(2) has the same melting point as that of C(16)G(2), namely 105 degrees C for both surfactants. A low-temperature polymorph of anhydrous C(14)G(2) crystallises from water at room temperature, whereas the hemihydrate of C(14)G(2) crystallises at 6 degrees C from water, or from chloroform containing trace water. X-ray data suggest both these crystalline modifications to comprise interdigitated and tilted alkyl chains.},
  author       = {Ericsson, Caroline and Ericsson, Louise C and Kocherbitov, Vitaly and Söderman, Olle and Ulvenlund, Stefan},
  issn         = {1463-9084},
  language     = {eng},
  number       = {15},
  pages        = {2970--2977},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Thermotropic phase behaviour of long-chain alkylmaltosides},
  url          = {http://dx.doi.org/10.1039/b502922h},
  volume       = {7},
  year         = {2005},
}