Chi Huanjie, Xu Zhiguang, Zhang Tao, Li Xiaomin, Wu Zhu, Zhao Yan
College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
China-Australia Institute for Advanced Materials and Manufacturing, Jiaxing University, Jiaxing 314001, China.
J Colloid Interface Sci. 2021 Jul 15;594:122-130. doi: 10.1016/j.jcis.2021.02.097. Epub 2021 Mar 9.
Stimuli-responsive surfaces with wettability change between superhydrophilic and superhydrophobic are susceptible to oil contamination which often ruins the surface. Herein, a coating with pH-switchable wettability transition between superamphiphobic and superhydrophilic-superoleophobic is achieved by rationally designing oleophobic/pH-responsive polymer heterogeneous chemistry. Fabrics modified with this coating show repellency to both water and oils, while upon exposure to acidic water (pH = 1) the fabrics change to be superhydrophilic-superoleophobic within a short response time of <5 s. More importantly, the superamphiphobicity of the fabric can be restored under mild alkaline condition (pH = 10), and the transition is reversible for many cycles. The effective in situ or ex situ wettability change under acidic/alkaline water treatment makes the coated fabric capable of separating oil-water mixture or even some mixtures of immiscible organic solvents. In addition, the coated fabric is also demonstrated to be promising as a new class of functional fabrics that provide protection against water and many oils in one condition, and can change to be hygroscopic, anti-static, oil-repellent and anti-oil-fouling in the other condition for improved wear comfort and self-cleaning.
具有超亲水和超疏水之间润湿性变化的刺激响应表面易受油污污染，这常常会破坏表面。在此，通过合理设计疏油/pH响应聚合物异质化学，实现了一种具有超两亲性和超亲水-超疏油之间pH可切换润湿性转变的涂层。用这种涂层改性的织物对水和油都具有拒斥性，而在暴露于酸性水（pH = 1）时，织物在<5秒的短响应时间内转变为超亲水-超疏油。更重要的是，织物的超两亲性可以在温和碱性条件（pH = 10）下恢复，并且这种转变可以进行许多循环且是可逆的。在酸性/碱性水处理下有效的原位或异位润湿性变化使得涂层织物能够分离油水混合物甚至一些不混溶有机溶剂的混合物。此外，涂层织物还被证明有望成为一类新型功能性织物，在一种条件下提供防水和防多种油的保护，而在另一种条件下可转变为吸湿、抗静电、拒油和防油污，以提高穿着舒适度和自清洁能力。
