润湿性是固体表面的重要性质之一,固液界面润湿性与表面微观结构、界面能等有关.研究了微观结构固体表面固液界面润湿性以及界面能、液滴重力、微观结构参数对润湿性的影响.分析表明,Young、Wenzel、Cassie、Cassie-Baxter等4种接触角模型分别把固体表面看成光滑、粗糙(液滴完全填满)、粗糙(液滴不填充)以及粗糙(液滴部分填充),后3种模型可用于实际固体表面,并可在3种状态下实现转换.设计了方柱凹坑、圆柱凹坑等微观结构表面,调控横径比、纵径比、深径比等微观结构参数,可以改变固液界面润湿性.研究发现,液滴重力对表面接触角存在稍许影响,界面能的大小决定着材料表面的疏/亲水性.
Wettability of solid surface is a very important property that is governed by both the surface energy and the geometrical microstructures.The interfacial wettability of periodic mierostructure solid surface is discussed.Then the effects of interfacial energy,liquid weight,and microstructure to interfacial wettability are analyzed.The solid surface is to be seen as lubricity,coarse/drop filled in entirely,coarse/drop unfilled in,coarse/drop filled in partly by four contact angle models such as Young,Wenzel,Cassie,and Cassie-Baxter in turn.Three behind models can be used in actual solid surface and transform in each other.Side column and column concave periodic microstructure surfaces are designed.The solid-liquid interfacial wettability of can be changed by adjusting the geometry parameters of microstructures such as length-to-diameter ratio,vertical-to-diameter ratio,deep-to-diameter ratio.The study show that drop weight affects lightly contact angle and interfacial energy determines hydrophobic or hydrophilic surface.
参考文献
| [1] | Wenzel R N .Surface roughness and contact angle[J].The Journal of Physical and Colloid Chemistry,1949,53:1466. |
| [2] | Cassie A B D .Contact angles[J].Discussion Farady Soc,1948,3:11. |
| [3] | Cassie A .Baxter S Wettability of porous surfaces[J].Transactions of the Faraday Society,1944,40:546. |
| [4] | 程帅,董云开,张向军.规则粗糙固体表面液体浸润性对表观接触角影响的研究[J].机械科学与技术,2007(07):822-827. |
| [5] | Patankar NA .Mimicking the lotus effect: Influence of double roughness structures and slender pillars[J].Langmuir: The ACS Journal of Surfaces and Colloids,2004(19):8209-8213. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%