Unidirectional water transportation and fog collection performance of Janus surface-patterned structures

doi:10.16085/j.issn.1000-6613.2023-1437

Abstract

Abstract:

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.

Key words: Janus structure, surface, unidirectional water transportation, fog collection

摘要：

受沙漠甲虫启发，本文引入单宁酸金属络合物（TA-Fe³⁺）和聚二甲基硅氧烷（PDMS）对无纺布（NFc）进行润湿性改性。通过浸渍喷涂法制备了表面图案化单宁酸-铁离子/聚二甲基硅氧烷Janus无纺布（p-TA-Fe³⁺/PDMS Janus NFc），利用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）等研究了其微观结构，并搭建水雾收集器测试其雾收集性能，进一步考察表面单向水传输性能，探讨集雾行为机制。结果表明，p-Janus NFc具有甲虫状图案化表面和不对称润湿性Janus结构，亲-疏交替的润湿表面和Janus结构产生的协同效应使其表现出良好的单向水传输性能和优异的水雾收集能力。在3.0h集雾实验中，p-Janus NFc集水率可高达193.31mg/（cm²·h），为相应超亲水材料的约16倍。这种生物启发性Janus无纺布材料为构建环保高效的集雾系统、缓解干旱半干旱地区水资源短缺现状提供了一条有力途径。

关键词: Janus结构, 表面, 单向水传输, 雾收集

CLC Number:

TB334

LI Ying, WANG Qizhao, BAI Bo, ZHANG Qian, SUN Wenjing, ZHANG Linxuan. Unidirectional water transportation and fog collection performance of Janus surface-patterned structures[J]. Chemical Industry and Engineering Progress, 2024, 43(9): 5133-5141.

李颖, 王其召, 白波, 张茜, 孙文静, 张琳璇. 表面Janus图案结构的单向导水集雾性能[J]. 化工进展, 2024, 43(9): 5133-5141.

Figures/Tables 8

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样品	水接触角（WCA）
原始NFc	0°
TA-Fe³⁺ NFc	29.08°
Janus NFc	142.59°(HB)	80.70°(HL)
p-Janus NFc	126.19°(HB)	72.40°(HL)

样品	水接触角（WCA）
原始NFc	0°
TA-Fe³⁺ NFc	29.08°
Janus NFc	142.59°(HB)	80.70°(HL)
p-Janus NFc	126.19°(HB)	72.40°(HL)

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