Basic properties of Gel-structured electro-rheological fluids

Yasuhiro Kakinuma, Tojiro Aoyama, H. Anzai, K. Isobe, K. Tanaka

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Electro-rheological fluids (ERFs) are composed of a functional fluid and colloidal suspension. Their rheological properties vary rapidly and reversibly with the applied electric field intensity. ERFs are mixtures of nonconductive silicone oil and inorganic/organic composite electro-rheological particles. Investigations into the properties of ERFs have led to remarkable advances in their performance in recent years. However, ERFs exhibit an undesirable property that obstructs the long-term use of ERF devices, namely the sedimentation and separation of ER particles from the silicone oil. The sedimentation of ER particles reduces the electro-rheological effect. In order to suppress the sedimentation and thereby improve the performance of ERF devices, a new functional material called Gel Structured ERF (ERG) is developed and its basic properties are analyzed in this study. The ER particles are sustained in the gel component, and thus will not precipitate out. This suppresses the decrease in ER effect associated with precipitation. The developed ERG shows large shear stress variation in response to the applied electric field. This high performance of ERGs involves a different mechanism than that observed in ERFs. In order to elucidate the mechanism in ERGs, the behavior of ER particles was observed under an electric field. Conditions at the interface between the electrode and ERG were found to change rapidly in response to the applied electric field, resulting in the variation of shear force.

Original languageEnglish
Pages (from-to)1339-1345
Number of pages7
JournalInternational Journal of Modern Physics B
Volume19
Issue number7-9
DOIs
Publication statusPublished - 2005 Apr 10

Fingerprint

Electrorheological fluids
Electrorheological Fluid
electrorheological fluids
Gels
gels
Sedimentation
Electric Field
Electric fields
Silicone Oils
electric fields
silicones
Silicones
oils
Colloidal Suspensions
Functional materials
Shear Stress
Particles (particulate matter)
shear stress
Electrode
colloids

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Basic properties of Gel-structured electro-rheological fluids. / Kakinuma, Yasuhiro; Aoyama, Tojiro; Anzai, H.; Isobe, K.; Tanaka, K.

In: International Journal of Modern Physics B, Vol. 19, No. 7-9, 10.04.2005, p. 1339-1345.

Research output: Contribution to journalArticle

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