Large-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide.
Large-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide.
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DOI：
10.1038/ncomms10891
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发表时间：
2016-03-07
影响因子：
16.6
通讯作者：
Majumder M
中科院分区：
文献类型：
--
作者：
Akbari A;Sheath P;Martin ST;Shinde DB;Shaibani M;Banerjee PC;Tkacz R;Bhattacharyya D;Majumder M
石墨烯为基础的膜表现出超快的水传输，气体和溶剂化分子的精确分子筛显示出很大的前景作为新的分离平台，然而，这些膜的规模扩大到大面积仍然是一个悬而未决的问题。在这里，我们证明了氧化石墨烯（GO）的分散相可以通过工业上适用的方法在<5 s内生产大面积膜（13 × 14 cm 2），剪切对齐以在支撑膜上形成高度有序的、连续的多层GO薄膜。压力驱动的传输数据证明了水合半径大于5 μ m的带电和不带电有机探针分子的高保留（>90%）以及单价和二价盐的适度保留（30-40%）。膜平面中高度有序的石墨烯片形成有序的通道并增强渗透性（对于150±15 nm厚的膜，为71±5 l m-2 hr-1 bar-1）。 由石墨烯制成的膜具有超快的水传输和精确的分子筛性能。在这里，作者展示了如何通过基于石墨烯氧化物液晶的剪切对齐的快速和可扩展的过程来制造大面积膜，以解锁工业应用。
Graphene-based membranes demonstrating ultrafast water transport, precise molecular sieving of gas and solvated molecules shows great promise as novel separation platforms; however, scale-up of these membranes to large-areas remains an unresolved problem. Here we demonstrate that the discotic nematic phase of graphene oxide (GO) can be shear aligned to form highly ordered, continuous, thin films of multi-layered GO on a support membrane by an industrially adaptable method to produce large-area membranes (13 × 14 cm2) in <5 s. Pressure driven transport data demonstrate high retention (>90%) for charged and uncharged organic probe molecules with a hydrated radius above 5 Å as well as modest (30–40%) retention of monovalent and divalent salts. The highly ordered graphene sheets in the plane of the membrane make organized channels and enhance the permeability (71±5 l m−2 hr−1 bar−1 for 150±15 nm thick membranes). Membranes made from graphene have ultra-fast water transport and precise molecular sieving properties. Here, the authors show how large-area membranes can be manufactured by a rapid and scalable process based on shear alignment of graphene-oxide liquid crystals for unlocking industrial applications.