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Janus Polyvinylidene Fluoride Membrane with Extremely Opposite Wetting Surfaces via One Single-Step Unidirectional Segregation Strategy
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1021/acsami.8b08278
Tiantian Li 1, 2 , Fu Liu 1, 2 , Shaofei Zhang 3 , Haibo Lin 1 , Jianqiang Wang 1, 2 , Chuyang Y. Tang 4
Affiliation  

Janus membranes with asymmetric wettability have attracted intense attention in oil/water separation, membrane distillation, liquid/fog collection, liquid diode, etc. Facile manipulation of the paradoxical wetting/antiwetting property on opposite surfaces of a 2D membrane is challenging. Different from most postmodification methods, herein, we propose one single-step unidirectional segregation strategy to fabricate a polymeric Janus membrane with extremely opposite wetting surfaces showing almost a 150° contact angle difference for the first time. We achieved the unidirectional segregation of the hydrophilic copolymer poly(vinylpyrrolidone-vinyltriethoxysilane) in a polyvinylidene fluoride (PVDF) membrane during phase separation. A glycerol coating on the nonwoven fabric support locally limited the phase separation on the bottom surface, blocked the segregation of hydrophilic copolymer, and promoted the segregation to the top surface. Working collaboratively with the asymmetric micro-/nanostructure on both surfaces, the resulting Janus membrane exhibited a superhydrophilic top surface and a superhydrophobic bottom surface. The Janus PVDF membrane showed switchable separation performance and high separation efficiency for both oil-in-water emulsions and water-in-oil emulsions because of its anisotropic wettability compared with solely hydrophobic or hydrophilic PVDF membranes.

中文翻译:

通过一种单步单向分离策略,具有极其相反的润湿表面的Janus聚偏二氟乙烯膜

具有不对称润湿性的Janus膜在油/水分离,膜蒸馏,液/雾收集,液体二极管等方面引起了广泛的关注。如何在2D膜的相对表面上进行自相矛盾的润湿/抗润湿特性的灵活操作具有挑战性。与大多数后改性方法不同,我们在此提出一种单步单向分离策略,以制造具有极其相反的润湿表面的聚合物Janus膜,这首次显示出几乎150°的接触角差。在相分离过程中,我们实现了聚偏二氟乙烯(PVDF)膜中亲水共聚物聚(乙烯基吡咯烷酮-乙烯基三乙氧基硅烷)的单向分离。无纺布载体上的甘油涂层局部限制了底表面的相分离,阻止亲水性共聚物的偏析,并促进偏析到顶表面。与两个表面上的不对称微/纳米结构协同工作,所得的Janus膜表现出超亲水的顶面和超疏水的底面。Janus PVDF膜对水包油型乳剂和油包水型乳剂均显示出可切换的分离性能和较高的分离效率,因为与仅疏水性或亲水性PVDF膜相比,它具有各向异性的润湿性。
更新日期:2018-07-03
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