Temperature-tunable wettability on a bioinspired structured graphene surface for fog collection and unidirectional transport†,Nanoscale

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Temperature-tunable wettability on a bioinspired structured graphene surface for fog collection and unidirectional transport†
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-29 00:00:00 , DOI: 10.1039/c7nr07728a
Yun-yun Song _{1,

2,

3,

4} , Yan Liu _{1,

2,

3,

4} , Hao-bo Jiang _{1,

2,

3,

4} , Shu-yi Li _{1,

2,

3,

4} , Cigdem Kaya _{5,

6} , Thomas Stegmaier _{5,

6} , Zhi-wu Han _{1,

2,

3,

4} , Lu-quan Ren _{1,

2,

3,

4}

Affiliation

We designed a type of smart bioinspired wettable surface with tip-shaped patterns by combining polydimethylsiloxane (PDMS) and graphene (PDMS/G). The laser etched porous graphene surface can produce an obvious wettability change between 200 °C and 0 °C due to a change in aperture size and chemical components. We demonstrate that the cooperation of the geometrical structure and the controllable wettability play an important role in water gathering, and surfaces with tip-shaped wettability patterns can quickly drive tiny water droplets toward more wettable regions, so making a great contribution to the improvement of water collection efficiency. In addition, due to the effective cooperation between super hydrophobic and hydrophilic regions of the special tip-shaped pattern, unidirectional water transport on the 200 °C heated PDMS/G surface can be realized. This study offers a novel insight into the design of temperature-tunable materials with interphase wettability that may enhance fog collection efficiency in engineering liquid harvesting equipment, and realize unidirectional liquid transport, which could potentially be applied to the realms of microfluidics, medical devices and condenser design.

中文翻译：

具有生物启发性的结构化石墨烯表面上的温度可调润湿性，用于雾收集和单向运输†

我们通过结合聚二甲基硅氧烷（PDMS）和石墨烯（PDMS / G）设计了一种具有尖端形状的智能生物启发型可湿性表面。由于孔径大小和化学成分的变化，激光蚀刻的多孔石墨烯表面可在200°C至0°C之间产生明显的润湿性变化。我们证明了几何结构和可控制的可湿性的配合在集水中起着重要作用，具有尖端形可湿性图案的表面可以迅速将微小的水滴推向更可湿的区域，从而为改善水质做出了巨大贡献收集效率。另外，由于特殊尖端形状图案的超疏水和亲水区域之间的有效配合，可以在200°C加热的PDMS / G表面上实现单向水传输。这项研究为具有相间润湿性的温度可调材料的设计提供了新颖的见解，它可以提高工程液体收集设备中的雾收集效率，并实现单向液体传输，这有可能应用于微流体，医疗设备和冷凝器领域设计。

更新日期：2018-01-29

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