Micro-gap flow behavior and micro-structure of stored electro-rheological nano-suspensions in the presence of sinusoidal electric field

Katsufumi Tanaka, Seiya Robson, Midori Takasaki, Haruki Kobayashi, Masami Nakano, Atsushi Totsuka

Research output: Contribution to journalArticlepeer-review

Abstract

Simultaneous observations of the electro-rheological (ER) effect and flow behavior within micro-gap were performed for a nano-suspension based on nano-particles of titanium dioxide and a chemically modified silicone oil stored for a long time. The ER effect and flow behavior in the presence of sinusoidal electric field simultaneously observed were discussed. In the presence of the sinusoidal electric field of 1 kHz, a chain-like microstructure spanning the two electrodes was induced for the nano-suspension stored for 28 months. The stability of the flow and the ER response was fairly well even for the stored nano-suspension in the presence of the sinusoidal electric field of 1 kHz. However, simultaneous observations showed substantial wall slip of the nano-suspension. The ER effect was also discussed in terms of a dimensionless relationship between the induced stress and Mason number, which is a characteristic ratio of viscous forces to polarization forces acting on a particle.

Original languageEnglish
Pages (from-to)441-451
Number of pages11
JournalColloid and Polymer Science
Volume295
Issue number3
DOIs
Publication statusPublished - 2017 Mar 1

Keywords

  • Electro-rheology
  • Flow behavior
  • Micro-gap
  • Microstructure
  • Nano-particles
  • Simultaneous observations
  • Sinusoidal electric field

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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