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Abstract: The dynamics of aggregated chains in magnetorh- elogical
suspensions subject to rotating magnetic fields are experimentally
studied combining scattering dichroism and video microscopy experiments.
When a rotating field is imposed the chainlike aggregates rotate
synchronously with the magnetic field. The total number of aggregated
particles shows two different behaviors depending on Mason number. For
low Mason numbers, it remains almost constant, and above the critical
Mason number, the rotation of the field prevents the particle
aggregation process from taking place, so the number of aggregated
particles decreases with Mason number. A molecular dynamics simulation
showing good agreement with the experiments results is also reported.
Key words: Magnetorhelogical suspensions Aggregation chain
Molecular-dynamics Mason number Rotating magnetic fields
CLC No: TB34
国家自然科学基金(20299030)，浙江省自然科学基金(M103028)和浙江省教育厅重点基金(20041174)资助项目.
Received 20040902, received in revised form 20050116 |