Unidirectional water transportation and fog collection performance of Janus surface-patterned structures
Inspired by desert beetles,tannic acid metal complex(TA-Fe3+)and polydimethylsiloxane(PDMS)were introduced for wettability modification of non-woven fabrics(NFc).Surface-patterned tannic acid-Fe3+/polydimethylsiloxane Janus non-woven fabric(p-TA-Fe3+/PDMS Janus NFc)was prepared by dipping and spraying method,and its microstructure and unidirectional water transport properties were investigated by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR).Besides,the water mist collector was constructed to test the mist collection performance to further investigate the surface unidirectional water transport properties and to explore the mechanism of the mist collection behavior.The results showed that p-Janus NFc with a beetle-like patterned surface and asymmetric wettable Janus structure exhibited good unidirectional water transport performance and excellent water mist collection due to the synergistic effects of alternating pro-hydrophobic wetting surfaces and Janus structures.In a 3.0h fog collection experiment,the water collection rate of p-Janus NFc could be as high as 193.31mg/(cm2·h),which was nearly 16 times of the corresponding superhydrophilic materials.This bio-inspired Janus non-woven material provided a powerful way to build an environmentally friendly and efficient fog collection system and alleviate water shortage in arid and semi-arid regions.
Janus structuresurfaceunidirectional water transportationfog collection
国家科技期刊平台
NSTL
万方数据
