超快粘性水流通过纳米线通道氧化石墨烯膜。
Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes.
机构信息
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310028, China.
Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China.
出版信息
Nat Commun. 2013;4:2979. doi: 10.1038/ncomms3979.
Pressure-driven ultrafiltration membranes are important in separation applications. Advanced filtration membranes with high permeance and enhanced rejection must be developed to meet rising worldwide demand. Here we report nanostrand-channelled graphene oxide ultrafiltration membranes with a network of nanochannels with a narrow size distribution (3-5 nm) and superior separation performance. This permeance offers a 10-fold enhancement without sacrificing the rejection rate compared with that of graphene oxide membranes, and is more than 100 times higher than that of commercial ultrafiltration membranes with similar rejection. The flow enhancement is attributed to the porous structure and significantly reduced channel length. An abnormal pressure-dependent separation behaviour is also reported, where the elastic deformation of nanochannels offers tunable permeation and rejection. The water flow through these hydrophilic graphene oxide nanochannels is identified as viscous. This nanostrand-channelling approach is also extendable to other laminate membranes, providing potential for accelerating separation and water-purification processes.
压力驱动的超滤膜在分离应用中很重要。为了满足全球不断增长的需求，必须开发具有高通量和增强选择性的先进过滤膜。在这里，我们报告了具有纳米通道网络的纳米带通道氧化石墨烯超滤膜，其纳米通道的尺寸分布狭窄（3-5nm），分离性能优异。与氧化石墨烯膜相比，这种渗透率提高了 10 倍，而选择性却没有降低，比具有类似选择性的商业超滤膜高 100 多倍。这种流速的增强归因于多孔结构和显著缩短的通道长度。我们还报告了一种异常的压力依赖分离行为，其中纳米通道的弹性变形提供了可调的渗透性和选择性。通过这些亲水性氧化石墨烯纳米通道的水流被确定为粘性流。这种纳米带通道的方法也可以扩展到其他层状膜，为加速分离和水净化过程提供了潜力。
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