Gradients of chemical potentials in a multiphase system induce mass transport and thus motion of interfaces. We probe the displacement of oil on a solid substrate immersed in water through this osmosis phenomenon by using microfabricated cavities that play the role of dead-end pores where oil is trapped in presence of salt crystals. The efficiency of oil removing from the model crevices is shown to be a function of geometrical and wetting properties, including heterogeneities of surface features. Counterintuitively, it is less probable for oil to move out from a hydrophilic cavity than from a hydrophobic one. Also, neighboring micro-cavities can lead to a better oil removal efficiency via the coalescence of oil menisci.

中文翻译：

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通过渗透从微腔中排出油

多相系统中化学势的梯度会引起质量传输，从而引起界面运动。我们通过使用微细加工的腔体来探究油浸在浸没在水中的固体基质上的位移，该微细加工的腔体起到了死孔的作用，在盐晶体存在的情况下油被困住了。从模型缝隙中去除油的效率显示为几何和润湿特性的函数，包括表面特征的不均匀性。与直觉相反，油从亲水腔中移出的可能性比从疏水腔中移出的可能性小。同样，相邻的微腔可通过油弯月面的聚结而提高除油效率。