Robust adhesion of droplets via heterogeneous dynamic petal effects

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:557

Article

Zheng, Yihua¹  Zhang, Chengchun^1,2  Wang, Jing³  Liu, Yan¹  Shen, Chun²  Yang, Junfeng⁴ 

[1] Jilin Univ, Minist Educ, Key Lab Bion Engn, Changchun 130022, Jilin, Peoples R China

[2] Jilin Univ, State Key Lab Automot Simulat & Control, Changchun 130022, Jilin, Peoples R China

[3] Jilin Univ, Coll Phys, Changchun 130012, Jilin, Peoples R China

[4] Univ Leeds, Sch Mech Engn, Leeds LS2 9JT, W Yorkshire, England

关键词: Dynamic petal effect;    Droplet impact;    Asymmetric wetting;    Sticky superhydrophobic;   

DOI  :  10.1016/j.jcis.2019.09.070

来源: Elsevier

【 摘 要 】

Hypothesis: Bionics and dynamic interface wetting intensely appeal to many research communities due to their unique practical implications. The rose petals had a highly robust dynamic water-retaining capacity under heavy precipitation. We predicted that the roses became more hydrophilic at higher Weber numbers. Experiments: Fresh rose petals were directly impacted by droplets, and facile artificial petal-like substrates and superhydrophobic substrates were used in the comparative analysis. The wetting dynamics of the droplet (e.g., topography, bounce dynamics, contact time, three-phase contact lines, and oscillations) were investigated when interacting with four selected target substrates. Findings: The present work first time investigated the dynamic wetting rule of the sticky superhydrophobic substrates (SSHS). Simulated and experimental investigations confirmed that the unique coupling synergy between the pinning effect and the inhomogeneous micropapillaes resulted in lopsided contact line velocities, which remarkably suppressed the lateral oscillation and rebounding. This may be a new strategy when designing dynamic water-repellent surfaces and open a promising avenue for emerging areas such as super-efficiency energy conversion and harvesting. (C) 2019 Elsevier Inc. All rights reserved.

【 授权许可】

Free