0

Full Content is available to subscribers

Subscribe/Learn More  >

Dependence of the Regime of Aggregate Structures of Magnetic Rod-Like Particles on the Magnetic Model

[+] Author Affiliations
Akira Satoh

Akita Prefectural University, Yuri-honjo, Japan

Paper No. IMECE2016-65352, pp. V007T09A023; 7 pages
doi:10.1115/IMECE2016-65352
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5061-9
  • Copyright © 2016 by ASME

abstract

In the present study, we attempt to discuss the dependence of the regime of the aggregate structures of magnetic rod-like particles on the magnetic model. Moreover, we briefly discuss the characteristic magneto-rheological properties of each magnetic model. Three representative magnetic models are here addressed for a magnetic rod-like particle, that is, (a) a spherocylinder particle with a dipole moment at the particle center (dipole model), (b) a spherocylinder particle with a plus and a minus charge at the center of each hemi-sphere (charge model) and (c) a spherocylinder with a dipole moment in a direction normal to the particle axis direction at the particle center (hematite model). For each magnetic model, molecular simulations based on the Monte Carlo method have been performed in order to elucidate the influences of magnetic particle-particle and particle-field interactions on the aggregate structures of magnetic spherocylinder particles in thermodynamic equilibrium. For the case of the dipole model, long stable raft-like clusters are gradually formed with increasing magnetic particle-particle interaction strength, and these raft-like clusters dissociate into the formation of chain-like clusters with increasing magnetic field strength. For the case of the charge model, long and thick chain-like clusters are more significantly formed with increasing magnetic interactions, and the thick chain-like clusters in the field direction become further thicker with increasing magnetic field strength. For the hematite model, long raft-like clusters are formed and these clusters still remain and incline in the field direction in a strong magnetic field situation. From these results, it is evident that the different magnetic model gives rise to the significantly different regime of the aggregate structures. Moreover, Brownian dynamics simulations have been conduced in order to clarify the dependence of the magneto-rheological characteristics on the regime of the above-mentioned particle aggregates. Among these magnetic models, the charge model yields the largest magneto-rheological effect, whereas the hematite model provides the negative viscosity due to the magnetic properties of particles.

Copyright © 2016 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In