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arXiv 2210.01022cond-mat.soft
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水在模型非均匀表面上的接触角。密度泛函方法

Contact angle of water on a model heterogeneous surface. A density functional approach

K. Dąbrowska, O. Pizio, S. Sokołowski

摘要:

我们用密度泛函方法计算了水模型在非均质类石墨表面上的接触角。表面的非均匀性是由于一层球形物种的预吸附造成的。预吸附的分子也可以是不同尺寸的分子的混合物。预吸附层的存在导致表面的几何和能量的不均匀性。考虑两种情况。预吸附的分子可以表现得像硬球障碍物,或者它们也可以吸引水分子。在第一种情况下,预吸附物种的量的增加导致润湿温度的增加,但这种增加不线性地依赖于障碍物的量。在障碍物对水分子施加吸引力的情况下,描述预吸附物质的量与接触角之间的依赖关系的曲线可以呈现最大值。此外,我们还研究了预吸附物种如何影响与改性固体表面接触的气相和液相的局部密度。

英文摘要:

We use a density functional approach to calculate the contact angle of the water model on a heterogeneous, graphite-like surface. The surface heterogeneity results from the pre-adsorption of a layer of spherical species. The pre-adsorbed molecules can also be a mixture of molecules of different sizes. The presence of pre-adsorbed layer causes geometrical and energetical heterogeneity of the surfaces. Two cases are considered. The pre-adsorbed molecules can either behave like hard-sphere obstacles, or they can also attract the molecules of water. In the first case, an increase of the amount of pre-adsorbed species leads to an increase of the wetting temperature, but this increase does not depend linearly on the amount of obstacles. In the case of obstacles exerting attractive forces on water molecules, the curves describing the dependence between the amount of pre-adsorbed species and the contact angle can exhibit a maximum. In addition, we have also studied how the pre-adsorbed species influence the local densities of gaseous and liquid phases in contact with a modified solid surface.

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