Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

被引：817

作者：

Huang, Hubiao ^{[1
]}

Song, Zhigong ^{[2
,3
]}

Wei, Ning ^{[2
,3
]}

Shi, Li ^{[1
]}

Mao, Yiyin ^{[1
]}

Ying, Yulong ^{[1
]}

Sun, Luwei ^{[1
]}

Xu, Zhiping ^{[2
,3
]}

Peng, Xinsheng ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310028, Zhejiang, Peoples R China

[2] Tsinghua Univ, Dept Engn Mech, Appl Mech Lab, Beijing 100084, Peoples R China

[3] Tsinghua Univ, Ctr Nano & Micro Mech, Beijing 100084, Peoples R China

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

关键词：

MOLECULAR-DYNAMICS SIMULATIONS; CARBON NANOTUBES; TRANSPORT; SEPARATION; COMPACTION; PERMEATION;

D O I：

10.1038/ncomms3979

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];

摘要：

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.

引用

页数：9

共 51 条

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