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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Adsorption of microstructured particles at liquid-liquid interfaces
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Adsorption of microstructured particles at liquid-liquid interfaces

机译：微结构颗粒在液-液界面处的吸附

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摘要

The solid particles are adsorbed at interfaces and form self-assembled structures when the particles have suitable wettability to both liquids. Here, we show theoretically how the microstructure on the particle surface affects their adsorption properties. The physical properties of the interface adsorbing a particle will be described by taking into account the surface roughness due to the microstructure. The microstructure on the surface changes drastically the wettability and the equilibrium position of the adsorbed particle. Therefore, the contact angle of the particle at the three-phase contact line shifts with the particle surface area, because the surface roughness enhances the interfacial properties of the particle surface. Moreover, the range of the interfacial tensions at which the particle is adsorbed becomes narrower with the increase of the surface roughness. The effect of the particle shape on the adsorption properties is also studied. In the case of disk-shaped particles, the energy changes discontinuously when the plane surface of the particle contacts the liquid-liquid interface. The adsorbing position does not change with the surface roughness. The orientation of a parallelepiped particle at the liquid-liquid interface is governed by the aspect ratio and the surface area of the particle. On the other hand, the particle which is partially covered with the microstructured surface is adsorbed firmly at the interface in an oriented state. We should consider not only the interfacial tensions but also the surface structure and the particle shape to control the adsorption behavior of the particle.
机译：当固体颗粒对两种液体都具有合适的润湿性时，固体颗粒会吸附在界面处并形成自组装结构。在这里，我们从理论上展示了颗粒表面的微观结构如何影响其吸附性能。将通过考虑由于微结构引起的表面粗糙度来描述吸附颗粒的界面的物理性质。表面的微观结构极大地改变了吸附颗粒的润湿性和平衡位置。因此，由于表面粗糙度提高了颗粒表面的界面性质，所以在三相接触线上颗粒的接触角随颗粒表面积而变化。而且，随着表面粗糙度的增加，吸附颗粒的界面张力的范围变窄。还研究了颗粒形状对吸附性能的影响。在盘状颗粒的情况下，当颗粒的平面接触液-液界面时，能量不连续地变化。吸附位置不随表面粗糙度而变化。平行六面体颗粒在液-液界面处的取向由颗粒的长径比和表面积决定。另一方面，部分被微结构化表面覆盖的颗粒在取向状态下牢固地吸附在界面上。我们不仅应考虑界面张力，还应考虑表面结构和颗粒形状，以控制颗粒的吸附行为。

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