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Strong Magnetic Field Induced Segregation and Self-Assembly of Micrometer Sized Non-Magnetic Particles

By Zhi Sun, Muxing Guo, Jef Vleugels, Omer Van der Biest, and Bart Blanpain
Progress In Electromagnetics Research B, Vol. 23, 199-214, 2010


Micrometer and sub-micrometer sized non-magnetic particles were manipulated by an external strong magnetic field (e.g. 10 Tesla) with a high gradient. During the strong magnetic field effects, segregation of the non-magnetic particles was observed which could not be realised only with gravitational field. Numerical calculations were subsequently carried out to understand the effects on the insulating particles in a conductive liquid matrix. The migration of micrometer sized particles is obviously enhanced by the magnetic field gradient. Combining the experimental results and theoretical analysis, particle-particle magnetic interaction was found to influence the overall segregation of the particles as well. Magnetised by the strong magnetic field, magnetic interaction between non-magnetic particles becomes dominant and a self-assembly behavior can be demonstrated. Various factors such as the magnetic dipole-dipole interaction and chain-chain interaction, are governing the particles assembly. According to calculations, magnetic field should be strong enough, at least 7 T in order to obtain the assembly morphologies in the present case.


Zhi Sun, Muxing Guo, Jef Vleugels, Omer Van der Biest, and Bart Blanpain, "Strong Magnetic Field Induced Segregation and Self-Assembly of Micrometer Sized Non-Magnetic Particles," Progress In Electromagnetics Research B, Vol. 23, 199-214, 2010.


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