Influence of electric field and shear on the rheology of fumed alumina in silicone oil suspensions

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dc.contributor.author Kumar, Saket
dc.contributor.author Thareja, Prachi
dc.date.accessioned 2016-10-18T18:36:06Z
dc.date.available 2016-10-18T18:36:06Z
dc.date.issued 2016-12
dc.identifier.citation Kumar, Saket and Thareja, Prachi, “Influence of electric field and shear on the rheology of fumed alumina in silicone oil suspensions”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, DOI: 10.1016/j.colsurfa.2016.10.006, vol. 511, pp. 339-350, Dec. 2016.
dc.identifier.issn 0927-7757
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2487
dc.identifier.uri http://dx.doi.org/10.1016/j.colsurfa.2016.10.006
dc.description.abstract We investigate the effect of shear and electric field (E) on the rheology of fumed alumina (Al2O3) − in − silicone oil suspensions (Al2O3/silicone oil) at varying Al2O3 nanoparticle loadings of 0.5 wt%–15 wt%. 0.5 wt% and 2.5 wt% Al2O3/silicone oil suspensions behave as Newtonian fluids and form gel − like suspensions at a nanoparticle loading of 10 wt% and above; attributed to the formation of a particulate network of fumed Al2O3 nanoparticles. Transient step − down experiments with 5 wt% and 15 wt% Al2O3/silicone oil suspensions indicate shear thinning and thixotropy. We also show that the dynamic rheology of gel − like 15 wt% Al2O3/silicone oil suspensions is extremely sensitive to the preshearing protocols. Depending on the preshear, partial or complete breakdown of the network structure in 15 wt% Al2O3/silicone oil suspensions is observed. Once the network structure breaks, the structural recovery doesn’t ensue at rest after the cessation of shear. On application of E, Al2O3/silicone oil suspensions with 0.5 wt%–5 wt% Al2O3 nanoparticle loading exhibit diverging low shear viscosity, frequency independent G′ along with the presence of a yield stress. The electrorheological response of 5 wt% Al2O3/silicone oil suspensions is independent of the preshearing protocols at an applied E = 1 kV/mm. Furthermore, the shear rheology with applied E does not scale with View the MathML source, instead linear and sub-linear scaling with applied E is observed. en_US
dc.description.statementofresponsibility by Saket Kumar and Prachi Thareja
dc.format.extent vol. 511, pp. 339-350
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Fumed nanoparticles en_US
dc.subject Rheology en_US
dc.subject Thixotropy en_US
dc.subject Electrorheology en_US
dc.title Influence of electric field and shear on the rheology of fumed alumina in silicone oil suspensions en_US
dc.type Article en_US
dc.relation.journal Colloids and Surfaces A: Physicochemical and Engineering Aspects
dc.relation.journal Journal of Dispersion Science and Technology


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