Affiliation of Author(s):材料科学与技术学院
Journal:ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Key Words:Superhydrophobic Designed nanostructures Water adhesion force Self-propelling ability
Abstract:The self-propelling ability toward achieving more efficient dropwise condensation intensively appeals to researchers due to its academic significance to explain some basic wetting phenomena. Herein we designed and fabricated the two types of microstructure superhydrophobic surfaces, i.e., sealed layered nanoporous structures (SLP-surface) and open nanocone structures (OC-surface). As a consequence, the resultant surfaces exhibit the robust water repellency, and the water droplet nearly suspends on the superhydrophobic surfaces (CA = 158.8 degrees +/- 0.5 degrees, SA = 4 degrees +/- 0.5 degrees for the SLP-surface and CA = 160.2 degrees +/- 0.4 degrees, SA = 1 degrees +/- 0.5 degrees for the OC-surface, respectively). Meanwhile, the impacting droplets can be rapidly rebounded off with a shorter contact time of 11.2 and 10.4 ms (impact velocity V-0 = 1 m/s). The excellent static-dynamic superhydrophobicity is mainly attributed to the air pockets captured by both microscopic rough structures. Regarding the self-propelling ability of condensed droplets, it is found that the droplet microscopic pinning effect of the SLP-surface severely weakens the dynamic self-propelling ability of condensed droplets. The capillary adhesive force induced by the sealed layered nanoporous structures is up to 16.0 mu N. However, the open nanocone structures cause lower water adhesive force (similar to 4.1 mu N) under the action of flowing air pockets, producing a higher dynamic self-propelling ability of condensed droplets. As a consequence, the open nanocone structure superhydrophobic surface displays a huge potential of inhibiting attachment of condensed droplets.
ISSN No.:2168-0485
Translation or Not:no
Date of Publication:2019-01-21
Co-author:Xie, Yuehan,Jie Tao,Chen, Haifeng,Zhu Chunling,Jin, Mingming,Lu Yang
Correspondence Author:沈一洲
Date of Publication:2019-01-21