Control of the wetting properties of 4He crystals in superfluid
Control of the wetting properties of 4He crystals in superfluid
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超流体中 4He 晶体润湿特性的控制
DOI：
10.1103/physreve.93.052806
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Y. Okuda
中科院分区：
文献类型：
--
作者：
T. Takahashi;H. Minezaki;A. Suzuki;K. Obara;K. Itaka;R. Nomura;and Y. Okuda
为了研究是否可以控制超流体中晶体在壁上的润湿，在非常低的温度下测量了粗糙和光滑壁上晶体的接触角。以简单的方式制备了粗糙的墙壁，其中使用市售的汽车镜涂层剂来涂覆玻璃板，该涂层剂使玻璃表面具有超疏水性。涂有该剂的粗糙壁上晶体的接触角增加了约30%。因此，超流体中晶体的排斥性的增加被证明在非常粗糙的表面上是可能的。接触角的增强和涂层表面的扫描电子显微镜图像都表明在表面上实现了晶体的Cassie-Baxter状态；晶体没有与壁完全接触，但在粗糙壁的中空部分中的晶体下方存在截留的超流体。
To investigate whether it is possible to control the wetting ofcrystals on a wall in superfluid, the contact angles ofcrystals were measured on rough and smooth walls at very low temperatures. A rough wall was prepared in a simple manner in which a commercially available coating agent for car mirrors, which makes the glass surface superhydrophobic, was used to coat a glass plate. The contact angles ofcrystals were increased by approximatelyon the rough wall coated with the agent. Therefore, the increase in the repellency ofcrystals in superfluid was demonstrated to be possible on a very rough surface. The enhancement of the contact angles and a scanning electron microscopy image of the coated surface both suggest that a Cassie-Baxter state ofcrystals was realized on the surface; the crystals did not have full contact with the wall, but entrapped superfluid was present beneath the crystals in the hollow parts of the rough wall.