Phase behavior and rheological properties of enzymatically synthesized trehalose decanoate aqueous solutions.
Identifieur interne : 001469 ( Main/Merge ); précédent : 001468; suivant : 001470Phase behavior and rheological properties of enzymatically synthesized trehalose decanoate aqueous solutions.
Auteurs : L. Choplin [France] ; V. Sadtler ; P. Marchal ; D. Sfayhi ; M. Ghoul ; J-M EngasserSource :
- Journal of colloid and interface science [ 0021-9797 ] ; 2006.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Tréhalose.
- synthèse chimique : Décanoate.
- Eau, Micelles, Propriétés de surface, Rhéologie, Réactifs réticulants, Résistance au cisaillement, Solutions, Structure moléculaire, Température, Tensioactifs, Transition de phase, Viscosité.
English descriptors
- KwdEn :
- MESH :
- chemical , chemical synthesis : Decanoates.
- chemical , chemistry : Cross-Linking Reagents, Solutions, Surface-Active Agents, Water.
- chemical , metabolism : Trehalose.
- chemical : Micelles.
- Molecular Structure, Phase Transition, Rheology, Shear Strength, Surface Properties, Temperature, Viscosity.
Abstract
Surface tension properties of an enzymatically synthesized equimolar mixture of trehalose mono- and didecanoate in aqueous solutions have been determined. At 20 degrees C a critical micellar concentration (CMC) of 50 micromol/l and a minimal surface tension of 28 mN/m have been obtained. Above the CMC, it has been shown that up to a concentration of 42 wt%, and in a 20-60 degrees C temperature range the sugar ester aqueous solutions do not form any crystalline structure, nor present any phase transition, and the trehalose decanoate molecules form an isotropic worm-like micellar phase. The rheological properties indicate however a more complicated picture in the same concentration and temperature ranges. In steady shear, the viscosity of the trehalose decanoate solutions do not exhibit any shear rate dependence from 1 to 100 s(-1) for concentrations up to 42 wt%. Below 0.8 wt%, the viscosity remains constant and close to that of water; then, between 0.8 and 23 wt%, the viscosity shows a quadratic increase with surfactant concentration. For higher concentrations, up to 42 wt%, no further significant increase in viscosity is observed. In oscillatory shear experiments, the solutions exhibit viscoelastic properties. The observed rheological behavior as a function of concentration and temperature may be due to a progressive evolution of the trehalose decanoate molecular associations: as the concentration increases, the system evolves towards an entangled and/or partially branched or cross-linked micellar network, and eventually a multiconnected network of cross-linked micelles.
DOI: 10.1016/j.jcis.2005.07.019
PubMed: 16125719
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Choplin</name><affiliation wicri:level="3"><nlm:affiliation>Centre de Génie Chimique des Milieux Rhéologiquement Complexes, INPL-ENSIC, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France. lionel.choplin@ensic.inpl-nancy.fr</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre de Génie Chimique des Milieux Rhéologiquement Complexes, INPL-ENSIC, 1 rue Grandville, BP 20451, 54001 Nancy Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Nancy</settlement></placeName></affiliation></author><author><name sortKey="Sadtler, V" sort="Sadtler, V" uniqKey="Sadtler V" first="V" last="Sadtler">V. Sadtler</name></author><author><name sortKey="Marchal, P" sort="Marchal, P" uniqKey="Marchal P" first="P" last="Marchal">P. Marchal</name></author><author><name sortKey="Sfayhi, D" sort="Sfayhi, D" uniqKey="Sfayhi D" first="D" last="Sfayhi">D. Sfayhi</name></author><author><name sortKey="Ghoul, M" sort="Ghoul, M" uniqKey="Ghoul M" first="M" last="Ghoul">M. Ghoul</name></author><author><name sortKey="Engasser, J M" sort="Engasser, J M" uniqKey="Engasser J" first="J-M" last="Engasser">J-M Engasser</name></author></analytic><series><title level="j">Journal of colloid and interface science</title><idno type="ISSN">0021-9797</idno><imprint><date when="2006" type="published">2006</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cross-Linking Reagents (chemistry)</term><term>Decanoates (chemical synthesis)</term><term>Micelles</term><term>Molecular Structure</term><term>Phase Transition</term><term>Rheology</term><term>Shear Strength</term><term>Solutions (chemistry)</term><term>Surface Properties</term><term>Surface-Active Agents (chemistry)</term><term>Temperature</term><term>Trehalose (metabolism)</term><term>Viscosity</term><term>Water (chemistry)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Décanoate (synthèse chimique)</term><term>Eau ()</term><term>Micelles</term><term>Propriétés de surface</term><term>Rhéologie</term><term>Réactifs réticulants ()</term><term>Résistance au cisaillement</term><term>Solutions ()</term><term>Structure moléculaire</term><term>Température</term><term>Tensioactifs ()</term><term>Transition de phase</term><term>Tréhalose (métabolisme)</term><term>Viscosité</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemical synthesis" xml:lang="en"><term>Decanoates</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cross-Linking Reagents</term><term>Solutions</term><term>Surface-Active Agents</term><term>Water</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Trehalose</term></keywords><keywords scheme="MESH" type="chemical" xml:lang="en"><term>Micelles</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Tréhalose</term></keywords><keywords scheme="MESH" qualifier="synthèse chimique" xml:lang="fr"><term>Décanoate</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Molecular Structure</term><term>Phase Transition</term><term>Rheology</term><term>Shear Strength</term><term>Surface Properties</term><term>Temperature</term><term>Viscosity</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Eau</term><term>Micelles</term><term>Propriétés de surface</term><term>Rhéologie</term><term>Réactifs réticulants</term><term>Résistance au cisaillement</term><term>Solutions</term><term>Structure moléculaire</term><term>Température</term><term>Tensioactifs</term><term>Transition de phase</term><term>Viscosité</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Surface tension properties of an enzymatically synthesized equimolar mixture of trehalose mono- and didecanoate in aqueous solutions have been determined. At 20 degrees C a critical micellar concentration (CMC) of 50 micromol/l and a minimal surface tension of 28 mN/m have been obtained. Above the CMC, it has been shown that up to a concentration of 42 wt%, and in a 20-60 degrees C temperature range the sugar ester aqueous solutions do not form any crystalline structure, nor present any phase transition, and the trehalose decanoate molecules form an isotropic worm-like micellar phase. The rheological properties indicate however a more complicated picture in the same concentration and temperature ranges. In steady shear, the viscosity of the trehalose decanoate solutions do not exhibit any shear rate dependence from 1 to 100 s(-1) for concentrations up to 42 wt%. Below 0.8 wt%, the viscosity remains constant and close to that of water; then, between 0.8 and 23 wt%, the viscosity shows a quadratic increase with surfactant concentration. For higher concentrations, up to 42 wt%, no further significant increase in viscosity is observed. In oscillatory shear experiments, the solutions exhibit viscoelastic properties. The observed rheological behavior as a function of concentration and temperature may be due to a progressive evolution of the trehalose decanoate molecular associations: as the concentration increases, the system evolves towards an entangled and/or partially branched or cross-linked micellar network, and eventually a multiconnected network of cross-linked micelles.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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