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Titolo:
Shear-thickening dilute surfactant solutions: Equilibrium structure as studied by small-angle neutron scattering
Autore:
Gamez-Corrales, R; Berret, JF; Walker, LM; Oberdisse, J;
Indirizzi:
Univ Montpellier 2, UMR CNRS, Dynam Phases Condensees Grp, F-34095 Montpellier 05, France Univ Montpellier 2 Montpellier France 05 F-34095 Montpellier 05, France Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA Carnegie Mellon Univ Pittsburgh PA USA 15213 gn, Pittsburgh, PA 15213 USA CEA Saclay, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France CEA SaclayGif Sur Yvette France F-91191 F-91191 Gif Sur Yvette, France
Titolo Testata:
LANGMUIR
fascicolo: 20, volume: 15, anno: 1999,
pagine: 6755 - 6763
SICI:
0743-7463(19990928)15:20<6755:SDSSES>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOSILATE-WATER SYSTEM; MICELLAR SOLUTIONS; WORMLIKE MICELLES; CATIONIC SURFACTANTS; DETERGENT SOLUTIONS; INDUCED GELATION; PHASE-BEHAVIOR; VISCOELASTICITY; POLYMERS; FRACTURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Berret, JF Univ Montpellier 2, UMR CNRS, Dynam Phases Condensees Grp, 5581, F-34095 Montpellier 05, France Univ Montpellier 2 5581 Montpellier France 05 llier 05, France
Citazione:
R. Gamez-Corrales et al., "Shear-thickening dilute surfactant solutions: Equilibrium structure as studied by small-angle neutron scattering", LANGMUIR, 15(20), 1999, pp. 6755-6763

Abstract

We have combined rheology and small-angle neutron scattering experiments to investigate dilute aqueous solution of cetyltrimethylammonium tosylate (CTAT). Rheology experiments have been performed under controlled strain conditions as function of concentration (phi = 0.05 - 1%) and temperature (T = 23-45 degrees C). At low surfactant concentration and under steady shear conditions, the CTAT exhibits a continuous increase of the apparent viscositywith increasing shear rates, also termed a shear-thickening transition. The critical shear rate for shear thickening varies strongly with the temperature according to an Arrhenius behavior, but very weakly with concentration. On the same solutions that were studied by rheology, neutron scattering was performed at rest to search for a correlation between the rheological features of the shear-thickening transition and the equilibrium micellar structure. We have found that (i) for all concentrations that display the thickening transition, the local morphology is that of cylindrical micelles, with a radius R = 21.0 +/- 0.5 Angstrom; (ii) all spectra exhibit a scatteringcorrelation peak due to strong electrostatic repulsion between charged micelles; (iii) the shear-thickening transition in CTAT displays the same rheological features for solutions prepared either in the dilute (phi < phi*) or in the semidilute (phi* < phi < 0.8%) regimes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 04:44:44