整流扩散电泳条件下胶体运动和斑图形成
Colloidal motility and pattern formation under rectified diffusiophoresis
摘要：
在这封信中，我们的实验特征的胶体和λ- DNA向更高浓度的溶质的扩散电泳运动，使用微流体技术来建立空间和时间控制的浓度梯度。然后，我们表明，偏析和空间图案的颗粒可以实现从时间变化的溶质浓度分布。这种偏析采取的形式是一个强大的捕获潜力，源于一个磁感应整流机制的溶质随时间的变化。根据溶质信号的空间和时间对称性，可以实现具有各种形状的定位模式。这些结果突出了溶质对比在软物质中发生的非平衡过程中的作用。
英文摘要：
In this letter, we characterize experimentally the diffusiophoretic motion of colloids and lambda- DNA toward higher concentration of solutes, using microfluidic technology to build spatially- and temporally-controlled concentration gradients. We then demonstrate that segregation and spatial patterning of the particles can be achieved from temporal variations of the solute concentration profile. This segregation takes the form of a strong trapping potential, stemming from an osmotically induced rectification mechanism of the solute time-dependent variations. Depending on the spatial and temporal symmetry of the solute signal, localization patterns with various shapes can be achieved. These results highlight the role of solute contrasts in out-of-equilibrium processes occuring in soft matter.
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