Extension of the surfactant bridge model for the electrorheological effects of surfactant-activated suspensions

Young Dae Kim, SukWoo Nam

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Surfactants influence the electrorheological (ER) response in two ways. At low surfactant concentrations, they enhance the ER response by enhancing the particle polarizability; at high concentrations, the response degrades (nonlinear ER response). The nonlinear ER behavior arises from the formation of surfactant bridges between the particles at high surfactant concentrations. A surfactant bridge model was introduced to explain the nonlinear behavior (τ0∝En, n≈1) of surfactant-activated ER suspensions when surfactant bridges were formed between the particles. Here, the surfactant bridge model is extended for the prediction of both the linear and nonlinear ER behaviors of surfactant-activated ER suspensions over the low and high surfactant concentrations (for Brij 30, from 0 to 7 wt%), regardless of the formation of surfactant bridges between the particles. For 20 wt% neutral alumina suspensions in silicone oil activated by Brij 30, the predicted ER behaviors show almost the same Brij 30 concentration and electric field strength dependence. It predicts the linear E2 dependence of the ER response at low surfactant concentrations and the nonlinear ER behavior at high surfactant concentrations. Also, the estimated yield stresses show fairly good agreement with the experimental data.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalJournal of Colloid and Interface Science
Volume269
Issue number1
DOIs
Publication statusPublished - 2004 Jan 1
Externally publishedYes

Fingerprint

Surface-Active Agents
Suspensions
Surface active agents
surfactants
Silicone Oils
Aluminum Oxide
electric field strength
silicones
Silicones
Yield stress
Alumina
aluminum oxides
oils
Electric fields

Keywords

  • ER suspensions
  • Nonlinear behavior
  • Surfactant bridge model
  • Surfactant-activated suspensions

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials

Cite this

Extension of the surfactant bridge model for the electrorheological effects of surfactant-activated suspensions. / Kim, Young Dae; Nam, SukWoo.

In: Journal of Colloid and Interface Science, Vol. 269, No. 1, 01.01.2004, p. 205-210.

Research output: Contribution to journalArticle

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