Two Roles of Nonionic Surfactants on the Electrorheological Response

Journal of Colloid and Interface Science
Y D Kim, D J Klingenberg

Abstract

The influence of three nonionic surfactants (Brij 30, GMO, and GTO) on the electrorheological response of various alumina/silicone oil suspensions is investigated. The dependence of the dynamic yield stress on such variables as surfactant type and concentration, water and ion content, and electric field strength and frequency is reported. The prevalent feature common to all formulations is that the yield stress, tau0, initially increases with surfactant concentration, passes through a maximum, and then decreases with surfactant concentration. Below the maximum, the yield stress increases quadratically with the field strength, E, while above the maximum, yield stress increases slower than E2. The increase in the yield stress with surfactant concentration is due to surfactant-enhanced interfacial polarization, which may arise from increased proton transport via neighboring hydrogen bonds. The nonlinear behavior observed at large surfactant concentrations (i.e., tau0 $\not\propto$ E2) arises from field-induced phase separation of a surfactant-rich phase as opposed to field-dependent conductivity of a homogeneous continuous phase.

Citations

Apr 29, 2006·Journal of Colloid and Interface Science·Cheng Hai HongHyoung Jin Choi
Mar 27, 1999·Journal of Colloid and Interface Science·Y A ShchipunovH Hoffmann
Mar 21, 2012·ACS Applied Materials & Interfaces·Ernest C McIntyrePeter F Green
Aug 28, 2013·ACS Applied Materials & Interfaces·Carl McIntyrePeter F Green
Jul 30, 2014·Soft Matter·Wen Ling Zhang, Hyoung Jin Choi
Dec 15, 2015·Nanomaterials·Seung Hyuk KwonHyoung Jin Choi
Apr 14, 2010·ACS Applied Materials & Interfaces·E Carl McIntyrePeter F Green
Oct 14, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·M M Ramos-TejadaA V Delgado
Mar 5, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Min S ChoWha-Seung Ahn

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