Coarsening mechanics of a colloidal suspension in toggled fields.
Coarsening mechanics of a colloidal suspension in toggled fields.
复制标题
切换场中胶体悬浮液的粗化力学。
作者：
Jonathan L. Bauer;Yifei Liu;Martin J Kurian;J. Swan;E. Furst
顺磁性胶体的悬浮液在切换磁场中被驱动相分离和自组装。当场强大于575A/m，频率在0.66~2赫兹之间时，初始的凝胶状的滞留网络崩塌为凝聚的椭圆形聚集体。这种平衡结构的演化是通过瑞利-高原不稳定性实现的。切换频率ν确定分解过程的流动性。在0.66至1.5赫兹的频率下，悬浮液的破裂类似于粘性的牛顿流体。在频率为ν>；1.5赫兹时，网络会像粘塑性材料一样破裂。场强改变了不稳定性的开始时间。当标度频率和场强可以用来预测破裂的开始时，呈现出一种幂定律关系。这些结果进一步有助于理解可极化胶体悬浮液在触发外场中相分离过程的力学和动力学。
Suspensions of paramagnetic colloids are driven to phase separate and self-assemble in toggled magnetic fields. At field strengths above 575 A/m and toggle frequencies between 0.66 and 2 Hz, an initial gel-like, arrested network collapses into condensed, ellipsoidal aggregates. The evolution to this equilibrium structure occurs via a Rayleigh-Plateau instability. The toggle frequency ν determines the fluidity of the breakup process. At frequencies between 0.66 and 1.5 Hz, the suspension breaks up similar to a viscous, Newtonian fluid. At frequencies ν > 1.5 Hz, the network ruptures like a viscoplastic material. The field strength alters the onset time of the instability. A power law relationship emerges as the scaled frequency and field strength can be used to predict the onset of breakup. These results further aid in understanding the mechanics and dynamics of the phase separation process of suspensions of polarizable colloids in toggled external fields.
影响因子：
41.2
作者：
Herzig, E. M.;White, K. A.;Clegg, P. S.
通讯作者：
Clegg, P. S.