Quasi-2D Monte Carlo simulations of a colloidal dispersion composed of magnetic plate-like particles with magnetic moment normal to the particle axis |
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Authors: | Akira Satoh Yasuhiro Sakuda |
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Institution: | 1. Department of Machine Intelligence and System Engineering , Akita Prefectural University , Yurihonjo, Japan asatoh@akita-pu.ac.jp;3. Integrated Course of Systems Science and Technology, Graduate school of Akita Prefectural University , Yurihonjo, Japan |
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Abstract: | We have investigated aggregation phenomena of a colloidal dispersion composed of magnetic plate-like particles by means of Monte Carlo simulations. Such plate-like particles have been modelled as disk-like particles with magnetic moment normal to the particle axis at the particle centre, with the section shape of a spherocylinder. The main objective of the present study is to clarify the influences of the magnetic field strength and magnetic interactions between particles on particle aggregation phenomena. We have concentrated our attention on a quasi-2D system from an application point of view such as the development of surface quality changing technology using such magnetic plate-like particles. A magnetic field is applied along the direction perpendicular to the plane of the monolayer. Internal structures of particle aggregates are discussed quantitatively in terms of radial distribution and orientational pair correlation functions. For the case of strong magnetic interactions between particles, particles form long column-like clusters with their magnetic moments alternating in direction between the neighbouring particles. These tendencies appear under circumstances of a weak applied magnetic field. However, as the magnetic field strength increases, particles incline towards the magnetic field direction, so that particles do not form such clusters. |
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Keywords: | magnetic colloidal dispersion plate-like particles aggregation phenomena column-like cluster radial distribution function orientational pair correlation |
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