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On the wetting translucency of hexagonal boron nitride

机译：六边形氮化物的润湿半透明

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摘要

When a liquid drop sits on an atomically thin layer of a 2D van der Waals (vdW) solid (like graphene) supported by a hydrophilic material, it is possible that the drop demonstrates an equilibrium contact angle that is influenced by this underlying hydrophilic material and hence is different from that observed on the bulk 2D material (e.g., graphite) surface. Such a behavior is known as the wetting translucency effect. While the wetting translucency effect of graphene has been extensively studied, the wetting translucency of hexagonal boron nitride (hBN) remains largely unexplored despite significant similarities in structural properties between these materials. In this study, we probe the wetting translucency of hBN. For this purpose, we conduct molecular dynamics simulations of water droplets and water films on hBN layers supported on a gold-like hydrophilic substrate. Our results show that for a substrate coated by monolayer hBN ("coated substrate"), depending on the contact distance between underlying substrate and hBN, an increase in the hydrophilicity of the underlying surface causes a monotonic increase in the overall adhesion energy between water and the coated substrate and a monotonic decrease in the contact angle of a drop on the coated substrate. For an increasing number of stacked hBN layers, the wettability of coated substrate becomes independent of the wettability of the underlying solid. Accordingly, our results confirm a distinct wetting translucency nature of hBN very similar to that observed in graphene.
机译：当液滴坐在由亲水材料支撑的2D范德华（VDW）固体（如石墨烯）的原子薄层上时，下降可以证明受该底层亲水材料和以下影响的平衡接触角因此，与在散装2D材料（例如，石墨）表面上观察到的不同。这种行为被称为润湿半透明效果。尽管这些材料之间的结构性质中具有显着相似性，但是石墨烯的润湿半透明效果在六方氮化硼（HBN）的润湿半透角仍然是未探测的。在这项研究中，我们探讨了HBN的润湿半透明。为此目的，我们在支撑在金色的亲水基板上的HBN层上进行水滴和水膜的分子动力学模拟。我们的结果表明，对于由单层HBN（“涂覆的基材”）涂覆的基材，取决于下面基底和HBN之间的接触距离，下面表面的亲水性的增加导致单调的水和水之间的整体粘附能量增加涂覆的基材和单调的涂覆基材上滴的接触角的减小。对于越来越多的堆叠的HBN层，涂覆衬底的润湿性与下面固体的润湿性无关。因此，我们的结果证实了与石墨烯中观察到的HBN的不同润湿半透明性质。

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    Wagemann Enrique; Wang Yanbin; Das Siddhartha; Mitra Sushanta K.;

  • 作者单位

    Univ Waterloo Waterloo Inst Nanotechnol Dept Mech &

    Mechatron Engn Micro Nanoscale Transport Lab Waterloo ON N2L 3G1 Canada;

    Univ Maryland Dept Mech Engn College Pk MD 20742 USA;

    Univ Maryland Dept Mech Engn College Pk MD 20742 USA;

    Univ Waterloo Waterloo Inst Nanotechnol Dept Mech &

    Mechatron Engn Micro Nanoscale Transport Lab Waterloo ON N2L 3G1 Canada;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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