Effect of silica colloids on the rheology of viscoelastic gels formed by the surfactant cetyl trimethylammonium tosylate

Simple item page
dc.creatorBandyopadhyay, R.
dc.creatorSood, A. K.
dc.date2004-09-16
dc.date.accessioned2026-07-07T03:00:52Z
dc.date.available2026-07-07T03:00:52Z
dc.descriptionThe effects of the addition of sub-micrometer sized colloidal silica spheres on the linear and nonlinear rheology of semi-dilute solutions of a viscoelastic gel are studied. For a 1.4 wt.% solution of the surfactant CTAT, a peak in the zero shear rate viscosity $η_{\circ}$ is observed at approximately equal weight percents of silica and CTAT. This peak shifts to lower silica concentrations on increasing either the CTAT concentration or the surface charge on silica and disappears when the CTAT concentration is increased to 2.6wt%. The increases in $η_{\circ}$ and the high frequency plateau modulus G$_{\circ}$ on the introduction of SiO$_{2}$ are explained by considering the increasingly entangled wormlike micelles that are formed due to the enhanced screening of the electrostatic interactions. The observed decrease in the values of G$_{\circ}$ and $η_{\circ}$ at higher concentrations of silica particles is explained in terms of the formation of surfactant bilayers due to the adsorption of the positively charged cetyl trimethylammonium to the negatively charged silica.
dc.description28 pages, includes 8 eps and 2 png figures; accepted for publication in Jl. Colloid Interface Sci
dc.identifierhttps://arxiv.org/abs/cond-mat/0409435
dc.identifierhttp://arxiv.org/abs/cond-mat/0409435
dc.identifierJl. Colloid Interface Sci 283, 585 (2005)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24885
dc.subjectSoft Condensed Matter
dc.titleEffect of silica colloids on the rheology of viscoelastic gels formed by the surfactant cetyl trimethylammonium tosylate
dc.typetext

Files

Collections

arXiv