特殊浸润性表面的液滴凝结

doi:10.7503/cjcu20180820

高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (6): 1236.doi: 10.7503/cjcu20180820

特殊浸润性表面的液滴凝结

林玉才^1,², 裴文乐¹, 孙若璇¹, 高春雷¹, 陈基棚², 郑咏梅¹()

1. 北京航空航天大学化学学院, 北京 100191
2. 福建师范大学化学与材料学院, 福州 365000

收稿日期:2018-12-06 出版日期:2019-06-10 发布日期:2019-04-24
作者简介:
联系人简介: 郑咏梅, 女, 博士, 教授, 博士生导师, 主要从事集水特性和液滴传输特性调控方面的研究. E-mail: zhengym@buaa.edu.cn
基金资助:
国家自然科学基金(批准号: 21473007, 21771015)资助.

Droplet Condensation on Surfaces with Special Wettability^†

LIN Yucai^1,², PEI Wenle¹, SUN Ruoxuan¹, GAO Chunlei¹, CHEN Jipeng², ZHENG Yongmei¹()

1. School of Chemistry, Beihang University, Beijing 100191, China
2. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 365000, China

Received:2018-12-06 Online:2019-06-10 Published:2019-04-24
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21473007, 21771015).

摘要/Abstract

摘要：

以铝片为基底, 经电化学腐蚀和沸水处理制备了多级微纳米结构; 通过气相沉积和涂油分别制备了超疏水表面、疏水超润滑(slippery)表面和亲水slippery表面; 探究了表面不同的特殊浸润性(超亲水、超疏水、疏水slippery和亲水slippery)对液滴凝结的影响. 结果表明, 超亲水表面的液滴凝结属于膜状冷凝, 超疏水表面和slippery表面的液滴凝结均属于滴状冷凝. 超疏水表面液滴合并时, 合并的液滴会不定向弹离表面. 疏水slippery表面和亲水slippery表面由于表面浸润性的不同导致液滴成核密度和液滴合并的差异, 亲水slippery表面凝结液滴的最大体积远大于疏水slippery表面凝结液滴的最大体积. 4种表面的雾气收集效率由大到小依次为亲水slippery表面>疏水slippery表面>超亲水表面>超疏水表面.

关键词: 特殊浸润性, 液滴凝结, 电化学腐蚀, 微纳米结构

Abstract:

The surfaces with micro/nano structures were fabricated by electrochemical corrosion and then boiling water treatment. Superhydrophobic surface was fabricated by chemical vapor deposition. Hydrophobic and hydrophilic surfaces were fabricated by coating surfaces with silicon oil and hydroxy-terminated silicon oil. Condensation on these surfaces (superhydrophilic, superhydrophobic, hydrophobic slippery and hydrophilic slippery) were investigated. Superhydrophilic surfaces show filmwise condensation. Both super hydrophobic and slippery surfaces show dropwise condensation. Superhydrophobic surfaces show out-of-plane jumping motion of the coalesced drops. Due to the wettability difference between the hydrophobic slippery surface and hydrophilic surface, fast droplet coalescence on hydrophilic slippery surfaces can effectively increase the droplet volume over time. The fog harvesting rates of different surfaces ranged in turn are hydrophilic slippery, hydrophobic slippery, superhydrophilic and superhydrophobic.

Key words: Special wettability, Droplet condensation, Electrochemical corrosion, Micro/nano structures

中图分类号:

O647

TrendMD:

林玉才, 裴文乐, 孙若璇, 高春雷, 陈基棚, 郑咏梅. 特殊浸润性表面的液滴凝结. 高等学校化学学报, 2019, 40(6): 1236.

LIN Yucai,PEI Wenle,SUN Ruoxuan,GAO Chunlei,CHEN Jipeng,ZHENG Yongmei. Droplet Condensation on Surfaces with Special Wettability^†. Chem. J. Chinese Universities, 2019, 40(6): 1236.

图/表 6

Fig.1 Fabrication processes of micro/nano structures(A) and SEM images of the original Al plate(B), the Al plate after electrochemical corrosion(C), the Al plate after boiling water treatment(D), and the nano-sturctures on the micro-structures after boiling water treatment(E)

Fig.2 Wettability of the surfaces (A) Superhydrophilic surface; (B) superhydrophobic surface; (C) hydrophobic surface slippery; (D) hydrophilic slippery surface.

Fig.3 Relationship between the conact angles/sliding angles and the wettability of the surfaces a. Superhydrophilic; b. superthydrophobic; c. hydrophilic slippory; d. hydrophobic slippery.

Fig.4 Water condensation on the surfaces with different wettabilities (A1—A5) Condensation on superhydrophilic surfaces; (B1—B5) condensation on superhydrophobic surfaces drops; (C1—C5) condensation oN hydrophobic surface, (D1—D5) condensation on hydrophilic surface. Time/s: (A1—D1) 0; (A2—D2) 150; (A3—D3) 300; (A4—D4) 450; (A5—D5) 600.

Fig.5 Sequential images of coalescence and bouncing behaviors of two droplets on superhydrophobic surface Time/ms: (A) 0; (B) 12; (C) 18; (D) 26.

Fig.6 Comparison of fog harvesting ability of four kinds of surface with different wettability (A) The relationship between the average diameter of largest droplet and the condensation time; (B) the relationship between the water colle-cted on different surfaces and the fog harvesting time.

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特殊浸润性表面的液滴凝结

Droplet Condensation on Surfaces with Special Wettability^†

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特殊浸润性表面的液滴凝结

Droplet Condensation on Surfaces with Special Wettability†

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Droplet Condensation on Surfaces with Special Wettability^†