Rapid and Persistent Suction Condensation on Hydrophilic Surfaces for High-Efficiency Water Collection

被引：61

作者：

Cheng, Yaqi ^{[1
,2
]}

Wang, Mingmei ^{[2
]}

Sun, Jing ^{[2
]}

Liu, Minjie ^{[2
]}

Du, Bingang ^{[1
]}

Liu, Yuanbo ^{[1
]}

Jin, Yuankai ^{[2
]}

Wen, Rongfu ^{[1
]}

Lan, Zhong ^{[1
]}

Zhou, Xiaofeng ^{[3
]}

Ma, Xuehu ^{[1
]}

Wang, Zuankai ^{[2
,4
]}

机构：

[1] Dalian Univ Technol, Inst Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Clean Utilizat Chem Resources, Dalian 116024, Peoples R China

[2] City Univ Hong Kong, Dept Mech Engn, Hong Kong 999077, Peoples R China

[3] East China Normal Univ, Sch Commun & Elect Engn, Shanghai Key Lab Multidimens Informat Proc, Shanghai 200241, Peoples R China

[4] City Univ Hong Kong, Res Ctr Nat Inspired Engn, Hong Kong 999077, Peoples R China

来源：

NANO LETTERS | 2021年 / 21卷 / 17期

基金：

中国国家自然科学基金;

关键词：

bioinspiration; condensation; wettability gradient; liquid suction; water collection; SUPERHYDROPHOBIC SURFACES; GROWTH; OPTIMIZATION; DROPLETS; REMOVAL;

D O I：

10.1021/acs.nanolett.1c01928

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Water collection by dew condensation emerges as a sustainable solution to water scarcity. However, the transient condensation process that involves droplet nucleation, growth, and transport imposes conflicting requirements on surface properties. It is challenging to satisfy all benefits for different condensation stages simultaneously. By mimicking the structures and functions of moss Rhacocarpus, here, we report the attainment of dropwise condensation for efficient water collection even on a hydrophilic surface gated by a liquid suction mechanism. The Rhacocarpus-inspired porous surface (RIPS), which possesses a three-level wettability gradient, facilitates a rapid, directional, and persistent droplet suction. Such suction condensation enables a low nucleation barrier, frequent surface refreshing, and well-defined maximum droplet shedding radius simultaneously. Thus, a maximum similar to 160% enhancement in water collection performance compared to the hydrophobic surface is achieved. Our work provides new insights and a design route for developing engineered materials for a wide range of water-harvesting and phase-change heat-transfer applications.

引用

页码：7411 / 7418

页数：8

共 51 条

[1] Condensation on hybrid-patterned copper tubes (I): Characterization of condensation heat transfer [J].