[article]
| Titre : |
Lyotropic liquid crystal formed in Brij35/copolymer/water system |
| Type de document : |
texte imprimé |
| Auteurs : |
Zhongni Wang, Auteur ; Feng Liu, Auteur ; Tandong Zhang, Auteur ; Xilian Wei, Auteur ; Wu Zhou, Auteur ; Xiaolu Tang, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 225-230 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Surfactants
|
| Tags : |
'Cristal liquide lyotropique' Surfactant Copolymère 'Comportement phase' Rhéologie |
| Index. décimale : |
668.1 Agents tensioactifs : savons, détergents |
| Résumé : |
Phase diagram of poly (ethylene oxide)-poly (propylene oxide)poly (ethylene oxide) copolymer (AL-64) and nonionic surfactant dodecyl polyoxyethylene (23) ether (Brij 35) aqueous solutions has been determined at 25 °C using the titration method. Hexagonal, cubic and two lamellar liquid crystalline phases were found and characterized by use of polar optical microscopy and small-angle X-ray scattering (SAXS) techniques. Dynamic rheological measurements were further performed on the found liquid crystals. It has been shown that the cubic and lamellar phases exhibit elastic properties, while the hexagonal phase presents viscoelastic properties. At the constant water content, with increase in the concentration of the copolymer AL-64, the rheological G′ and G″ moduli, the critical shear stress and the network strength of the hexagonal liquid crystals get decreased. The two lamellar phases exhibit clearly different rheological properties, and the lamellar phase lies in Brij35 rich side possess stronger network strength than the hexagonal phase, through the rheological data analyses. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Materials - Phase diagram determination - Polarization microscopy - Small-angle X-ray scattering (SAXS) - Rheological measurements
- RESULTS AND DISCUSSION : Phase behaviour of Brij 35/1L-64/water system - Rheological properties - |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14902 |
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 3 (04-05/2012) . - p. 225-230
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