Sauret Alban, Boulogne François, Cébron David, Dressaire Emilie, Stone Howard A
Surface du Verre et Interfaces, UMR 125 CNRS/Saint-Gobain, 93303 Aubervilliers, France.
Soft Matter. 2015 May 28;11(20):4034-40. doi: 10.1039/c5sm00401b. Epub 2015 Apr 22.
We investigate the equilibrium morphology of a finite volume of liquid placed on two parallel rigid fibers of different radii. As observed for identical radii fibers, the liquid is either in a column morphology or adopts a drop shape depending on the inter-fiber distance. However the cross-sectional area and the critical inter-fiber distance at which the transition occurs are both modified by the polydispersity of the fibers. Using energy considerations, we analytically predict the critical inter-fiber distance corresponding to the transition between the column and the drop morphologies. This distance depends both on the radii of the fibers and on the contact angle of the liquid. We perform experiments using a perfectly wetting liquid on two parallel nylon fibers: the results are in good agreement with our analytical model. The morphology of the capillary bridges between fibers of different radii is relevant to the modeling of large arrays of polydisperse fibers.
我们研究了放置在两根不同半径的平行刚性纤维上的有限体积液体的平衡形态。正如在相同半径纤维的情况中所观察到的，根据纤维间距离，液体要么呈柱状形态，要么呈液滴形状。然而，纤维的多分散性会改变发生转变时的横截面积和临界纤维间距离。通过能量考虑，我们解析预测了对应于柱状和液滴形态之间转变的临界纤维间距离。这个距离既取决于纤维的半径，也取决于液体的接触角。我们使用一种完全润湿的液体在两根平行尼龙纤维上进行了实验：结果与我们的解析模型高度吻合。不同半径纤维之间的毛细桥形态与多分散纤维大阵列的建模相关。
