Precise nanofiltration in a fouling-resistant self-assembled membrane with water-continuous transport pathways
Precise nanofiltration in a fouling-resistant self-assembled membrane with water-continuous transport pathways
复制标题
DOI：
10.1126/sciadv.aav9308
复制
发表时间：
2019-08-01
期刊：
影响因子：
13.6
通讯作者：
Osuji, Chinedum O.
中科院分区：
文献类型：
--
作者：
Feng, Xunda;Imran, Qaboos;Osuji, Chinedum O.
自组装材料对于下一代膜具有吸引力。然而，需要对齐自组装纳米结构（如圆柱体，laminate）和窄的稳定窗口有序双连续系统提出了严峻的挑战。我们提出并证明了一种新的方法，利用尺寸选择性运输的水连续介质中的纳米结构的聚合物模板从自组装的溶致H-1中间相，规避这些挑战。中间相组成的优化使得H1结构在光诱导交联时能够高保真保留。所得的材料是具有由连续水性介质包围的内部和外部交联的纳米原纤维的机械坚固的纳米结构聚合物。制造的膜在1- 2-nm长度尺度下显示尺寸选择性，并且水渗透性类似于10升/米（-2）小时（-1）巴（-1）μ m。此外，由于纳米原纤表面上的季铵基团，膜显示出优异的抗微生物性能。这些结果代表了聚合的溶致中间相膜在实际水净化应用中的潜在用途的突破。
Self-assembled materials are attractive for next-generation membranes. However, the need to align self-assembled nanostructures (e.g. cylinders, lamellae) and the narrow stability windows for ordered bicontinuous systems present serious challenges. We propose and demonstrate a novel approach that circumvents these challenges by exploiting size-selective transport in the water-continuous medium of a nanostructured polymer templated from a self-assembled lyotropic H-1 mesophase. Optimization of the mesophase composition enables high-fidelity retention of the H1 structure on photoinduced cross-linking. The resulting material is a mechanically robust nanostructured polymer possessing internally and externally cross-linked nanofibrils surrounded by a continuous aqueous medium. Fabricated membranes show size selectivity at the 1- to 2-nm length scale and water permeabilities of similar to 10 liters m(-2) hour(-1) bar(-1) mu m. Moreover, the membranes display excellent antimicrobial properties due to the quaternary ammonium groups on the nanofibril surfaces. These results represent a breakthrough for the potential use of polymerized lyotropic mesophase membranes in practical water purification applications.