Free energy barrier in wetting parallel-structured surfaces
发布时间：2023-01-30点击次数：
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DOI码：10.1016/j.colsurfa.2022.130214
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发表刊物：Colloids and Surfaces A: Physicochemical and Engineering Aspects
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关键字：Parallel structure；Wettability；Thermodynamics；Energy barrier；Microfiber
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摘要：Parallel structures with various simple cross-section geometries, such as trapezoid, rectangle, and circle, can be patterned on surfaces to control wettability. Free energy barriers that hinder a system from reaching its global minimum of free energy can influence the wetting behaviors. Specifying the forming conditions of energy barriers help evaluate metastable contact angles and contact angle hysteresis. Therefore, a thermodynamic model relating free energy with the continuous movement of three-phase contact line is needed to evaluate the energy barrier. This paper reports an integrated thermodynamic model for various parallel structures with simple geometries. Forming conditions of energy barriers are derived from the thermodynamic model, and validated using experimental data by electrospun microfibers and existing theoretical works. For sharp-edge structures with an internal angle φ and an intrinsic contact angle θY, the initiating and ending apparent contact angles for energy barriers are θY+φ and θY–φ, respectively, in noncomposite state, but this range may be discontinuous when θY<φ/2 or θY>180˚–φ/2. For round structures, an energy barrier may form at every structure in noncomposite state. In our experiment, aligned electrospun microfibers (with a mean radius of 0.9 µm) can pin the droplet at the first advancing energy barrier and achieve contact angles greater than 150˚.
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论文类型：期刊论文
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论文编号：130214
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卷号：655
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是否译文：否
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发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0927775722019690
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俞和胜
职务：Professor
主要任职：
个人信息
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博士生导师
硕士生导师 - 教师拼音名称：yuhesheng
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- 所在单位：化工学院
- 职务：Professor
- 办公地点：中国矿业大学文昌校区综合楼203
- 性别：男
- 学位：博士
- 职称：教授
- 毕业院校：加拿大滑铁卢大学
学术荣誉：
- 2020当选：江苏特聘教授
曾获荣誉：
- 2020-08-01江苏特聘教授
- 2014-10-15加拿大国家自然科学基金工业博士后奖学金
- 2020-08-01中国矿业大学“高端人才计划”攀登学者
- 2019-06-01江苏省“六大人才高峰”高层次人才
- 2018-06-28江苏省“双创博士”
- 2016-08-01AIChE Journal Editor’s Choice Paper
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