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Ultrafast and On-Demand Oil/Water Separation Membrane System Based on Conducting Polymer Nanotip Arrays.
Nano Letters ( IF 10.8 ) Pub Date : 2020-06-22 , DOI: 10.1021/acs.nanolett.0c00911
Zhengao Wang 1, 2 , Peng Yu 1, 2 , Jiajia Zhou 3 , Jingwen Liao 4 , Lei Zhou 1 , Heying Ran 1 , Jingxia Zhai 1 , Jun Xing 1 , Guoxin Tan 5 , Zhengnan Zhou 1 , Yangfan Li 1 , Chengyun Ning 1, 2 , Yahong Zhou 6
Affiliation  

Ultrafast oil/water separation based on tunable superwettability switch remains a big challenge. Here, inspired by the ultrafast water transport mechanism in sarracenia, we develop a micro/nanostructured porous membrane with conducting polymer nanotip arrays through the surface-initiated polymerizations. By modulating the height (ranging from 49–529 nm) and redox states of nanotips, a smart reversible superwettability switch is facile to obtain with contact angles of water/oil arranging from 161° to about 0°. Besides, liquid transport speed was accelerated more than 1.5 times by increasing the nanotip length. The water flux could reach up to 50326 L m–2 h–1 (1000 times that of a typical industrial ultrafiltration membrane). This is attributed to the stable and continuous water film along the nanotips, which provide a lubrication layer, leading to an increase of permeability. This work provides significant insights into macro/nanostructured membrane design for smart separation, blood lipid filtration, and smart nanoreactors with high permeability.

中文翻译:

基于导电聚合物纳米尖端阵列的超快速按需油/水分离膜系统。

基于可调超润湿性开关的超快速油水分离仍然是一个巨大的挑战。在这里,受制于瓶子草的超快速水传输机制,我们开发了一种微/纳米结构的多孔膜,该膜具有通过表面引发的聚合作用而形成的导电聚合物纳米尖端阵列。通过调节纳米尖端的高度(范围为49–529 nm)和氧化还原状态,智能的可逆超润湿性开关可轻松获得水/油的接触角在161°至约0°的范围内。此外,通过增加纳米尖端的长度,液体的传输速度提高了1.5倍以上。水通量可能达到50326 L m –2 h –1(是典型的工业超滤膜的1000倍)。这归因于沿着纳米尖端的稳定且连续的水膜,其提供了润滑层,从而导致了渗透性的增加。这项工作为智能分离,血脂过滤和具有高渗透性的智能纳米反应器提供了对宏观/纳米结构膜设计的重要见解。
更新日期:2020-07-08
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