Deformation and motion by gravity and magnetic field of a droplet of water-based magnetic fluid on a hydrophobic surface

Hiroko Asakura, Akira Nakajima, Munetoshi Sakai, Shunsuke Suzuki, Yoshikazu Kameshima, Kiyoshi Okada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Motion and deformation of a water-based magnetic fluid on a hydrophobic surface were investigated under gravity and a magnetic field. Surface energy and the resultant contact angle of the magnetic fluid depend on the surfactant concentration. The fluid viscosity is governed mainly by magnetite concentration. The front edge of the droplet moved under a weak external field. The rear edge required a higher external field for movement. The forces of gravity and the magnetic field for moving of the front edge are almost equal. However, those of the rear edge are different. The motion of magnetic fluids by an external field depends on concentrations of surfactants and magnetic particles, the external field, and experimental assembly.

Original languageEnglish
Pages (from-to)3098-3102
Number of pages5
JournalApplied Surface Science
Volume253
Issue number6
DOIs
Publication statusPublished - Jan 15 2007
Externally publishedYes

Keywords

  • Contact angle
  • Hydrophobic
  • Magnetic field
  • Magnetic fluid
  • Sliding angle

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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