临界Casimir相互作用的边界条件可调性
Tunability of Critical Casimir Interactions by Boundary Conditions
摘要：
我们的实验表明，临界Casimir力在胶体系统中可以连续调谐的边界条件的选择。胶体颗粒在水和2，6-二甲基吡啶的混合物中的相互作用势已被测量，在其优先吸附性能的混合物的组分的梯度的基板上。我们发现，在温度不变但相对于梯度不同位置的相互作用势连续地从吸引变为排斥。这表明临界Casimir力不仅对微小的温度变化有反应，而且对表面性质的微小变化也有反应。
英文摘要：
We experimentally demonstrate that critical Casimir forces in colloidal systems can be continuously tuned by the choice of boundary conditions. The interaction potential of a colloidal particle in a mixture of water and 2,6-lutidine has been measured above a substrate with a gradient in its preferential adsorption properties for the mixture's components. We find that the interaction potentials at constant temperature but different positions relative to the gradient continuously change from attraction to repulsion. This demonstrates that critical Casimir forces respond not only to minute temperature changes but also to small changes in the surface properties.
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