透明超疏水纳米阵列的构建及露滴自弹跳特性

doi:10.7503/cjcu20160198

高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (10): 1882.doi: 10.7503/cjcu20160198

透明超疏水纳米阵列的构建及露滴自弹跳特性

张友法(), 安力佳, 郝建霞, 余新泉, 陈锋

东南大学材料科学与工程学院, 江苏省先进金属材料高技术研究重点实验室, 南京 211189

收稿日期:2016-03-30 出版日期:2016-10-10 发布日期:2016-09-18
作者简介:联系人简介: 张友法, 男, 博士, 副教授, 主要从事材料表面微纳米技术的研究.E-mail:yfzhang@seu.edu.cn
基金资助:
国家自然科学基金(批准号: 51671055, 51676033)、江苏省自然科学基金(批准号: BK20151135)、江苏省六大人才高峰项目(批准号: 2015-JNHB-005)和江苏省先进金属材料高技术研究重点实验室项目(批准号: BM2007204)资助

Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops^†

ZHANG Youfa^*(), AN Lijia, HAO Jianxia, YU Xinquan, CHEN Feng

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Received:2016-03-30 Online:2016-10-10 Published:2016-09-18
Contact: ZHANG Youfa E-mail:yfzhang@seu.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.51671055, 51676033), the Natural Science Foundation of Jiangsu Province, China(No.BK20151135), the Six Talent Peaks of Jiangsu Province, China(No.2015-JNHB-005) and the Jiangsu Key Laboratory of Advanced Metallic Materials, China(No.BM2007204)

摘要/Abstract

摘要：

利用溶胶-凝胶技术制备氧化锌晶种层, 再通过化学氧化法在FTO玻璃表面制备了高度垂直取向的氧化锌纳米棒阵列. 研究了晶种溶胶浓度和液相化学生长时间对阵列纳米结构形貌的影响规律和作用机理, 并进一步分析了表面润湿性和透明性的变化情况. 通过氧化锌纳米棒阵列的可控构建, 获得了平均透光率可达95%的透明超疏水表面. 密集生长的纳米阵列使得该表面在稳态结露条件下, 直径约10 μm的小尺度球状露滴合并后易发生自驱弹跳, 脱附率高, 露滴数量密度、覆盖率和平均直径均能保持在恒定范围, 显示出优异的抗结露特性.

关键词: 纳米阵列, 氧化锌, 超疏水, 透明, 自弹跳

Abstract:

Highly-oriented ZnO nanorod arrays on FTO were fabricated by chemical oxidation of ZnO seed layer deposited by a sol-gel method. We studied the influence and its mechanism of solution concentration for crystal seed layer and thereafter growth time for nanorods on the morphology of nano-arrays, and then further explained the change of wettability and transparency. By precisely controlling the fabrication of the nano-arrays, we obtained a superhydrophobic surface with 95% of average transmittance. Owing to densely growth of nanorod arrays, the surface was mainly covered by micro-drops with the diameter of ca.10 μm under steady condensation. Moreover, the tiny dew drops could self-eject during coalescence together and then easily detach from the surface. The measured results of number density, coverage and average diameter of the drops therefore kept constant, showing excellent performance of anti-condensation.

Key words: Nano-arrays, ZnO, Superhydrophobicity, Transparency, Self-ejection

中图分类号:

O647

TrendMD:

张友法, 安力佳, 郝建霞, 余新泉, 陈锋. 透明超疏水纳米阵列的构建及露滴自弹跳特性. 高等学校化学学报, 2016, 37(10): 1882.

ZHANG Youfa, AN Lijia, HAO Jianxia, YU Xinquan, CHEN Feng. Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops^†. Chem. J. Chinese Universities, 2016, 37(10): 1882.

图/表 7

Fig.1 SEM images(A—C) and XRD patterns(D) of as-prepared ZnO nano-rod arrays Spin coating with 0.3 mol/L sol and subsequent 2 h growth in the solution. (A) Low magnification;(B) high magnification; (C) cross-section of nano-rods.

Fig.2 Size parameters of the ZnO nano-rod arrays on FTO(A) Different concentrations of seeds solution; (B) different immersion time in growth solution. a. Height; b. diameter; c. spacing.

Fig.3 Effects of concentration of seeds solution and growth time on water wettability Concentration of seed solution/(mol·L-1): ◆◇ 0.1; ■□ 0.2; ▲△ 0.3; ●○ 0.4.

Fig.4 Effects of concentration of seeds solution and growth time on transmittance(A) Digital image of a transparent superhydrophobic FTO sample fabricated with concentration of seeds solution of 0.1 mol/L and growth time of 0.5 h, inset shows the spherical shape of a drop on the surface. (B) average transmittance of the samples.

Fig.5 Condensation behavior of the transparent superhydrophobic nano-arrays on a 2 ℃ cold stage under ambient conditions(temperature 17 ℃, relative humidity 42%)The sample is prepared with concentration of seeds solution of 0.1 mol/L and growth time of 0.5 h. Time-lapse optical images of dropwise condensation for 5 min(A), 10 min(B), 20 min(C) and 30 min(D), respectively. (E)—(H) Snap shots of self-jumping of a drop during condensation. Time/ms: (E) 0; (F) 1; (G) 5; (H) 48.

Fig.6 Quantification of the condensate drops on the transparent superhydrophobic nano-arrays (A) Measured drop number densities and drop surface coverage on the surface; (B) time evolution of average drop diameter; (C) histogram of drop diameter. a. 1—10 μm; b. 10—20 μm; c. 20—30 μm; d. 30—40 μm;e. 40—50 μm; f. 50—60 μm; g. >60 μm.

Fig.7 Schematic illustration of droplets motion on superhydrophobic nano-arrays(A) Forces of a droplet during moving; (B) self-jumping of a droplet resulted from coalesce.

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透明超疏水纳米阵列的构建及露滴自弹跳特性

Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops^†

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透明超疏水纳米阵列的构建及露滴自弹跳特性

Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops†

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Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops^†