Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation,ACS Applied Materials & Interfaces

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Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acsami.7b15909
Xiaojing Su , Hongqiang Li , Xuejun Lai , Lin Zhang , Xiaofeng Liao , Jing Wang , Zhonghua Chen , Jie He ₁ , Xingrong Zeng

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Superhydrophobic surfaces with tunable adhesion from lotus-leaf to rose-petal states have generated much attention for their potential applications in self-cleaning, anti-icing, oil–water separation, microdroplet transportation, and microfluidic devices. Herein we report a facile magnetic-field-manipulation strategy to fabricate dual-functional superhydrophobic textiles with asymmetric roll-down/pinned states on the two surfaces of the textile simultaneously. Upon exposure to a static magnetic field, fluoroalkylsilane-modified iron oxide (F-Fe₃O₄) nanoparticles in polydimethylsiloxane (PDMS) moved along the magnetic field to construct discrepant hierarchical structures and roughnesses on the two sides of the textile. The positive surface (closer to the magnet, or P-surface) showed a water contact angle up to 165°, and the opposite surface (or O-surface) had a water contact angle of 152.5°. The P-surface where water droplets easily slid off with a sliding angle of 7.5° appeared in the “roll-down” state as Cassie mode, while the O-surface was in the “pinned” state as Wenzel mode, where water droplets firmly adhered even at vertical (90°) and inverted (180°) angles. The surface morphology and wetting mode were adjustable by varying the ratios of F-Fe₃O₄ nanoparticles and PDMS. By taking advantage of the asymmetric adhesion behaviors, the as-fabricated superhydrophobic textile was successfully applied in no-loss microdroplet transportation and oil–water separation. Our method is simple and cost-effective. The fabricated textile has the characteristics of superhydrophobicity, magnetic responsiveness, excellent chemical stability, adjustable surface morphology, and controllable adhesion. Our findings conceivably stand out as a new tool to fabricate functional superhydrophobic materials with asymmetric surface properties for various potential applications.

中文翻译：

具有不对称滚落/固定状态的双功能超疏水纺织品，用于水滴运输和油水分离

从荷叶到玫瑰花瓣状态具有可调节附着力的超疏水表面，由于其在自清洁，防冰，油水分离，微滴运输和微流体装置中的潜在应用而备受关注。在这里，我们报告了一种简便的磁场操纵策略，以同时在纺织品的两个表面上制造具有不对称的卷起/固定状态的双功能超疏水性纺织品。暴露于静磁场中时，氟烷基硅烷改性的氧化铁（F-Fe ₃ O ₄聚二甲基硅氧烷（PDMS）中的纳米粒子沿着磁场移动，从而在纺织品的两侧构造出不同的层次结构和粗糙度。正表面（更靠近磁体或P面）的水接触角高达165°，而相对表面（或O面）的水接触角为152.5°。水滴容易以7.5°的滑动角滑落的P面在Cassie模式下呈“向下滚动”状态，而O曲面在稳固的状态下呈Wenzel模式，呈水滴状，处于牢固的状态即使在垂直（90°）和倒转（180°）角度下也能粘附。通过改变F-Fe ₃ O ₄的比例可以调节表面形态和润湿方式纳米颗粒和PDMS。通过利用不对称的粘附行为，制成的超疏水性织物成功地用于无损微滴运输和油水分离。我们的方法简单且具有成本效益。制成的纺织品具有超疏水性，磁响应性，优异的化学稳定性，可调节的表面形态和可控制的粘合性的特征。我们的发现可想而知，可以作为一种新型工具来制造具有不对称表面特性的功能性超疏水材料，以用于各种潜在应用。

更新日期：2018-01-19

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