Reference : Liquid Crystalline Phases Induced by the Hydroxyl Group Stereochemistry of Amphiphilic C...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
http://hdl.handle.net/2268/115173
Liquid Crystalline Phases Induced by the Hydroxyl Group Stereochemistry of Amphiphilic Carbohydrate Bicatenary Derivatives
English
Razafindralambo, Hary mailto [Université de Liège - ULg > Chimie et bio-industries > Chimie biologique industrielle >]
Richel, Aurore mailto [Université de Liège - ULg > Chimie et bio-industries > Chimie biologique industrielle >]
Paquot, Michel mailto [Université de Liège - ULg > Chimie et bio-industries > Chimie biologique industrielle >]
Lins, Laurence mailto [Université de Liège - ULg > Chimie et bio-industries > Biophysique moléc. numér. >]
Blecker, Christophe mailto [Université de Liège - ULg > Chimie et bio-industries > Science des alim. et formul. >]
2012
Journal of Physical Chemistry B
American Chemical Society
116
13
3998-4005
Yes (verified by ORBi)
International
1520-6106
1520-5207
Washington
DC
[en] Liquid crystal ; Surface films ; Differential scanning calorimetry ; Carbohydrate-based amphiphilic compounds ; Thermodynamic investigations ; Molecular Dynamics models
[en] Liquid-crystals (LC) may exist in different phases depending upon the orientational and positional orders of molecules in the material. Here, we demonstrate that the class of LC state induced by amphiphilic carbohydrate bicatenary derivatives is strictly a hydroxyl group stereochemistry-dependent. This statement results from the experimental and theoretical investigations of surface film (2D) and bulk solid (3D) thermal behavior of synthetic stereoisomers n-tetradecyl (-D-n-tetradecyl) galacto- and gluco-pyranosiduronate, with an axial (GalA-C14/14) or equatorial (GlcA-C14/14) hydroxyl group at the fourth carbon, respectively. Surface pressure-area isotherms (283 K to 310 K), differential scanning calorimetry thermograms (223 K to 573 K), and polarized optical textures (298-363 K) reveal that GlcA-C14/14 organizes as a smectic LC-like phase (positional or lateral order) whereas the analogous stereoisomeric GalA-C14/14 behaves as a nematic LC-like phase (orientational order). Thermodynamic investigations and molecular dynamics models computed under similar temperature conditions provide consistent data with physical properties resulting from experimental approaches.
Researchers ; Professionals ; Students ; General public ; Others
http://hdl.handle.net/2268/115173
10.1021/jp209765j

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