Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (10): 1882.doi: 10.7503/cjcu20160198
• Physical Chemistry • Previous Articles Next Articles
ZHANG Youfa*(), AN Lijia, HAO Jianxia, YU Xinquan, CHEN Feng
Received:
2016-03-30
Online:
2016-10-10
Published:
2016-09-18
Contact:
ZHANG Youfa
E-mail:yfzhang@seu.edu.cn
Supported by:
CLC Number:
TrendMD:
ZHANG Youfa, AN Lijia, HAO Jianxia, YU Xinquan, CHEN Feng. Fabrication of Transparent Superhydrophobic Nano-arrays and Self-ejecting Behavior of Dew Drops†[J]. Chem. J. Chinese Universities, 2016, 37(10): 1882.
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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