Fine Switching between Underwater Superoleophilicity and Underwater Superoleophobicity while Maintaining Superhydrophobicity
Fine Switching between Underwater Superoleophilicity and Underwater Superoleophobicity while Maintaining Superhydrophobicity
复制标题
在保持超疏水性的同时，在水下超亲油性和水下超疏油性之间进行精细切换
DOI：
10.1021/acs.langmuir.0c00154
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Jing Li
中科院分区：
文献类型：
--
作者：
Lu Tie;Siyang Zhao;Zhiguang Guo;Jing Li
超疏水/水下超亲油和超亲水/水下超疏油之间的转换已被广泛设计。最近，超润湿性被细分为油、水和空气的多种极端润湿状态，如润湿相和介质相。然而，多个超润湿性之间的精细切换是罕见的。在这里，提出了一个ph响应案例，以展示在保持超疏水性的同时，在水下超亲油性和水下超疏油性之间的精细切换。银粗化铜涂层的表面化学是由防水的全氟烷基和烷基链以及智能末端羧基精心操纵的。通过调节水的pH值，可以精确控制油在水中完全相反的极端润湿状态。同时，由于全氟烷基链具有相当低的表面能，因此对空气中的水具有极强的拒水性。这一发现加速了超润湿性的细分和不寻常的超润湿切换的实现。
Switching between superhydrophobicity/underwater superoleophilicity and superhydrophilicity/underwater superoleophobicity has been widely designed. Recently, superwettability is subdivided into multiple extreme wetting states for oil, water, and air as wetting and medium phases. However, fine switching among the multiple superwettability is rare. Here, a pH-responsive case is presented to demonstrate the fine switching between underwater superoleophilicity and underwater superoleophobicity while maintaining superhydrophobicity. The surface chemistry of silver-roughened copper coatings is elaborately manipulated by water-repellent perfluoroalkyl and alkyl chains and the smart terminal carboxyl group. By adjusting the pH value of water, the completely opposite extreme wetting states for oil in water are precisely controlled. Simultaneously, the extreme repellence for water in the air can be kept owing to the fairly low surface energy of the perfluoroalkyl chain. This discovery accelerates the subdivision of superwettability and the achievement of unusual superwetting switching.