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3D Printing of Bioinspired Liquid Superrepellent Structures
Author(s) -
Liu Xiaojiang,
Gu Hongcheng,
Wang Min,
Du Xin,
Gao Bingbing,
Elbaz Abdelrahman,
Sun Liangdong,
Liao Julong,
Xiao Pengfeng,
Gu Zhongze
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201800103
Subject(s) - materials science , wafer , nanotechnology , surface tension , microfluidics , polymerization , isotropy , etching (microfabrication) , 3d printing , silicon , chemical engineering , optoelectronics , polymer , composite material , optics , layer (electronics) , physics , engineering , quantum mechanics
Bioinspired re‐entrant structures have been proved to be effective in achieving liquid superrepellence (including anti‐penetration, anti‐adhesion, and anti‐spreading). However, except for a few reports relying on isotropic etching of silicon wafers, most fluorination‐dependent surfaces are still unable to repel liquids with extreme low surface energy (i.e., γ < 15 mN m −1 ), especially those fluorinated solvents. Herein, triply re‐entrant structures, possessing superrepellence to water (with surface tension γ of 72.8 mN m −1 ) and various organic liquids (γ = 12.0–27.1 mN m −1 ), are fabricated via two‐photon polymerization based 3D printing technology. Such structures can be constructed both on rigid and flexible substrates, and the liquid superrepellent properties can be kept even after oxygen plasma treatment. Based on the prepared triply re‐entrant structures, micro open capillaries are constructed on them to realize directional liquid spreading, which may be applied in microfluidic platforms and lab‐on‐a‐chip applications. The fabricated arrays can also find potential applications in electronic devices, gas sensors, microchemical/physical reactors, high‐throughput biological sensors, and optical displays.