Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/9612
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Wormlike micelles in mixed surfactant systems: effect of cosolvents |
Autor: | Varade, Dharmesh; Rodríguez-Abreu, Carlos CSIC ORCID; Shrestha, Lok Kumar; Aramaki, Kenji | Palabras clave: | Viscoelastic solutions Wormlike solutions Surfactant systems Cosolvents |
Fecha de publicación: | 16-ago-2007 | Editor: | American Chemical Society | Citación: | The Journal of Physical Chemistry B 111(35): 10438-10447 (2007) | Resumen: | We have studied the structure and rheological behavior of viscoelastic wormlike micellar solutions in the mixed nonionic surfactants poly(oxyethylene) cholesteryl ether (ChEO15)-trioxyethylene monododecyl ether (C12EO3) and anionic sodium dodecyl sulfate (SDS)-C12EO3 using a series of glycerol/water and formamide/ water mixed solvents. The obtained results are compared with those reported in pure water for the corresponding mixed surfactant systems. The zero-shear viscosity first sharply increases with C12EO3 addition and then decreases; i.e., there is a viscosity maximum. The intensity (viscosity) and position (C12EO3 fraction) of this maximum shift to lower values upon an increase in the ratio of glycerol in the glycerol/water mixed solvent, while the position of the maximum changes in an opposite way with increasing formamide. In the case of the SDS/C12EO3 system, zero-shear viscosity shows a decrease with an increase of temperature, but for the ChEO15/C12EO3 system, again, the zero-shear viscosity shows a maximum if plotted as a function of temperature, its position depending on the C12EO3 mixing fraction. In the studied nonionic systems, worm micelles seem to exist at low temperatures (down to 0°C) and high glycerol concentrations (up to 50 wt %), which is interesting from the viewpoint of applications such as drag reduction fluids. Rheology results are supported by small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) measurements on nonionic systems, which indicate micellar elongation upon addition of glycerol or increasing temperature and shortening upon addition of formamide. The results can be interpreted in terms of changes in the surface curvature of aggregates and lyophobicity. | Descripción: | 10 pages, 13 figures.-- PMID: 17696527 [PubMed].-- Printed version published on Sep 6, 2007. | Versión del editor: | http://dx.doi.org/10.1021/jp0740999 | URI: | http://hdl.handle.net/10261/9612 | DOI: | 10.1021/jp0740999 | ISSN: | 1520-5207 |
Aparece en las colecciones: | (IQAC) Artículos |
Mostrar el registro completo
CORE Recommender
SCOPUSTM
Citations
40
checked on 25-abr-2024
WEB OF SCIENCETM
Citations
36
checked on 25-feb-2024
Page view(s)
404
checked on 26-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.