Energy conversion in ferrofluids: Magnetic nanoparticles as motors or generators

F. Gazeau, C. Baravian, J. C. Bacri, R. Perzynski, M. I. Shliomis

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

We submit a [Formula Presented] ferrofluid in rigid rotation (and then in a Couette flow) to an alternating magnetic field. Rotational viscosity and transverse magnetization are measured simultaneously. Depending on the relative values of fluid vorticity and field frequency, the magnetic particles behave as nanomotors or nanogenerators. It demonstrates the energy conversion between the magnetic and kinetic degrees of freedom of the particles. The effect of an hydrodynamic shear on the spectrum of relaxation times evidences an intimate structure of the ferrofluid consisting of small chains of dipoles.

Original languageEnglish
Pages (from-to)614-618
Number of pages5
JournalPhysical Review E
Volume56
Issue number1
DOIs
StatePublished - 1 Jan 1997
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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