Oil-triggered switchable wettability on patterned alternating air/lubricant-infused superamphiphobic surfaces

被引:22
|
作者
Liu, Weijian [1 ]
Pan, Rui [1 ]
Cai, Mingyong [1 ]
Luo, Xiao [1 ]
Chen, Changhao [1 ]
Jiang, Guochen [1 ]
Hu, Xinyu [1 ]
Zhang, Hongjun [1 ]
Zhong, Minlin [1 ]
机构
[1] Tsinghua Univ, Laser Mat Proc Res Ctr, Sch Mat Sci & Engn, Minist Educ,Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金; 中国博士后科学基金;
关键词
CONTACT-ANGLE HYSTERESIS; SELF-CLEANING SURFACES; SUPERHYDROPHOBIC SURFACES; LASER-ABLATION; DUAL-SCALE; ALUMINUM; MOTION; MANIPULATION; PICOSECOND;
D O I
10.1039/c9ta14116b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the present study, we report a novel oil-triggered surface (OTS) by integrating three extreme states of hydrophobicity, i.e., 'lotus-leaf-like' superhydrophobicity, 'nepenthes-like' slippery liquid-infused surface hydrophobicity and 're-entrant-structure-induced' superamphiphobicity. The OTS is fabricated by an ultra-fast laser based technology through creating alternating gas/oil infused superhydrophobic-superoleophilic micro-nanostructures among superamphiphobic micro-nanostructures. We demonstrate that the precisely arrayed superhydrophobic-superoleophilic micro-nanostructures can be reversely switched quickly to be in a 'lotus-leaf-like' gas-infused or 'nepenthes-like' oil-infused state through an oil-triggered method. The test droplets can slide with freedom on gas-infused superhydrophobic-superoleophilic patterns while they will be confined, guided or self-driven by oil-infused ones. Especially, the droplets can move along oil-infused patterns with a high mobility, but without pinning, liquid loss or cross contamination. The surfaces are further used as droplet-manipulation chips to attest real-time operating ability, on which the test droplets can be selectively 'trapped', 'guided', 'directed', 'pumpless-moved', 'pumpless-dragged', 'pumpless-pulled' and 'pumpless-pushed' in real time through the remote control of the oil-triggered method. In addition, our OTSs manifest a remarkable long-time stability of >80 days and cycle-to-cycle stability of >10 cycles. With multiple functions and various superior abilities, the OTSs have expansive application prospects. Especially, the oil-triggered strategy and laser-based technology proposed here may aid the development of various fields related to liquid manipulation and smart switchable surfaces.
引用
收藏
页码:6647 / 6660
页数:14
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