Dynamic transitions and oscillatory melting of a two-dimensional crystal subjected to shear flow
Dynamic transitions and oscillatory melting of a two-dimensional crystal subjected to shear flow
复制标题
剪切流作用下二维晶体的动态转变和振荡熔化
DOI：
10.1122/1.1631425
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发表时间：
2004
影响因子：
3.3
通讯作者：
G. Fuller
中科院分区：
文献类型：
--
作者：
E. J. Stancik;Anne L. Hawkinson;J. Vermant;G. Fuller
在剪切流作用下，考察了单分散球形聚苯乙烯颗粒悬浮在癸烷和水界面上时的颗粒间动力学和结构的微妙平衡效应。由于可电离的表面硫酸根基团，强烈的偶极-偶极排斥作用促使颗粒在静态条件下排列在六方晶格上。然而，剪切流的界面的应用，迫使晶格进入一个新的半有序，各向异性的状态，在此状态下，粒子浓度和施加的剪切速率施加很大的控制。在低颗粒浓度或高剪切速率下，由流动施加的力主导系统，并导致颗粒串在流动方向上对齐，以促进它们彼此经过的运动。在高浓度或低剪切速率下可以看到与此行为的显著对比，其中颗粒间力变得重要并且倾向于更强烈地保持颗粒在其L中。
The effect of a delicate balance of forces on the interparticle dynamics and structure of monodisperse spherical polystyrene particles suspended at the interface between decane and water was observed as shear flow was applied to the system. A strong dipole–dipole repulsion, due to ionizable surface sulfate groups, induces the particles to arrange themselves on a hexagonal lattice under quiescent conditions. The application of a shear flow to the interface, however, forces the lattice into a new semiordered, anisotropic state over which great control is exerted by particle concentration and applied shear rate. At low particle concentrations or high shear rates, the forces applied by the flow dominate the system and cause strings of particles to align in the flow direction to facilitate their movement past each other. A remarkable contrast to this behavior is seen at high concentrations or low shear rates, where the interparticle forces gain importance and tend to more strongly keep the particles in their l...