On the behavior of an oblate spheroidal hematite particle in a simple shear flow under a uniform magnetic field applied in the flow direction

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• 作者：Akira Satoh (1)
  Haruka Yokoyama (1)
  
• 关键词：Magnetic colloidal dispersion ; Simple shear flow ; Oblate spheroidal particle ; Orientational distribution function ; Rheological properties ; Viscosity ; Diffusion coefficient
• 刊名：Colloid & Polymer Science
• 出版年：2014
• 出版时间：April 2014
• 年：2014
• 卷：292
• 期：4
• 页码：935-944
• 全文大小：2,888 KB
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• 作者单位：Akira Satoh (1)
  Haruka Yokoyama (1)
  
  1. Faculty of Systems Science and Technology, Akita Prefectural University, 84-4, Ebinokuchi, Tsuchiya-aza, Yuri-honjo, 015-0055, Japan
  
• ISSN：1435-1536

文摘

We discuss the orientational properties of an oblate spheroidal hematite particle and also its influence on the rheological characteristics of a dilute suspension of these magnetic particles, by means of an analytical approach based on the orientational distribution function. A hematite particle with oblate spheroidal shape has an important characteristic; that is, it is magnetized in a direction normal to the particle axis. From the balance of the torques acting on a particle, we have developed the basic equation of the orientational distribution function. This basic equation has been numerically solved in order to investigate the dependence of the orientational distribution on the various factors. If both the magnetic field and the shear flow are weak, the particle does not exhibit specific directional characteristics. If the magnetic field is more dominant, the particle inclines such that the oblate surface is parallel to the magnetic field direction. If the shear flow becomes more dominant, the particle shows a sharper peak of the orientational distribution in the shear flow direction. The viscosity due to the magnetic torque increases and finally converges to a constant value as the magnetic field increases. In a sedimentation process under the gravitational field, the translational diffusion coefficient decreases with increasing magnetic field strength in the present case of the magnetic field direction.