Chemical and Biological Engineering Department and Rheology Research Center, University of Wisconsin, Madison, WI 53706, USA.
J Phys Condens Matter. 2010 Aug 18;22(32):324101. doi: 10.1088/0953-8984/22/32/324101. Epub 2010 Jul 15.
Effects of nonmagnetic interparticle forces on the on- and off-state behavior of magnetorheological fluids are investigated experimentally and with particle-level simulations. Suspensions of iron particles in an aliphatic oil are modified by surface-active species. The modifications significantly alter the off-state properties, but have little impact on the field-induced stresses. Simulations show similar behavior. Off-state rheological properties are strongly influenced by van der Waals forces and modifications of the short-range repulsive forces. Field-induced stresses are less sensitive to the nonmagnetic forces.
实验和颗粒级模拟研究了非磁性颗粒间相互作用力对磁流变液的开/关状态行为的影响。在脂肪油中的铁颗粒悬浮液通过表面活性物质进行改性。改性显著改变了关闭状态的性能，但对磁场诱导的应力影响很小。模拟显示出类似的行为。关闭状态的流变性能受范德华力和短程排斥力的修饰强烈影响。磁场诱导的应力对非磁性力的敏感度较低。
