扩散电泳操作沉积在水凝胶上的液滴中的颗粒
Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel
摘要：
我们报告了一个实验研究的操纵胶体颗粒在一滴坐在水凝胶。该操作是通过扩散电泳实现的，扩散电泳描述了由溶质梯度引起的颗粒的定向运动。通过使液滴和水凝胶的溶质浓度不同，我们控制了颗粒在稳定悬浮液中的运动，这是难以实现的。我们发现，扩散电泳可以导致颗粒移动或者朝向或远离液体-空气界面取决于溶质梯度的方向和颗粒的表面电荷。我们测量的颗粒吸附实验和合理化的结果与一维数值模型。我们发现，扩散泳运动是显着的水凝胶上沉积的一滴，这表明了一个简单的方法在水凝胶上的颗粒沉积的长度尺度。
英文摘要：
We report an experimental study on the manipulation of colloidal particles in a drop sitting on a hydrogel. The manipulation is achieved by diffusiophoresis, which describes a directed motion of particles induced by solute gradients. By letting the solute concentrations for the drop and the hydrogel be different, we control the motion of particles in a stable suspension, which is otherwise difficult to achieve. We show that diffusiophoresis can cause the particles to move either toward or away from the liquid-air interface depending on the direction of the solute gradient and the surface charge of the particles. We measure the particle adsorption experimentally and rationalize the results with a one-dimensional numerical model. We show that diffusiophoretic motion is significant at the lengthscale of a drop deposited on a hydrogel, which suggests a simple method for the deposition of particles on hydrogels.
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