Precise and Ultrafast Molecular Sieving Through Graphene Oxide Membranes

被引：2157

作者：

Joshi, R. K. ^{[1
]}

Carbone, P. ^{[2
]}

Wang, F. C. ^{[3
]}

Kravets, V. G. ^{[1
]}

Su, Y. ^{[1
]}

Grigorieva, I. V. ^{[1
]}

Wu, H. A. ^{[3
]}

Geim, A. K. ^{[1
]}

Nair, R. R. ^{[1
]}

机构：

[1] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Sch Chem Engn & Analyt Sci, Manchester M13 9PL, Lancs, England

[3] Univ Sci & Technol China, Dept Modern Mech, Chinese Acad Sci, Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China

来源：

SCIENCE | 2014年 / 343卷 / 6172期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

CARBON NANOTUBE; SEPARATION MEMBRANES; GRAPHITE OXIDE; WATER; TRANSPORT; PERMEATION;

D O I：

10.1126/science.1245711

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：

07 ; 0710 ; 09 ;

摘要：

Graphene-based materials can have well-defined nanometer pores and can exhibit low frictional water flow inside them, making their properties of interest for filtration and separation. We investigate permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions. The laminates are vacuum-tight in the dry state but, if immersed in water, act as molecular sieves, blocking all solutes with hydrated radii larger than 4.5 angstroms. Smaller ions permeate through the membranes at rates thousands of times faster than what is expected for simple diffusion. We believe that this behavior is caused by a network of nanocapillaries that open up in the hydrated state and accept only species that fit in. The anomalously fast permeation is attributed to a capillary-like high pressure acting on ions inside graphene capillaries.

引用

页码：752 / 754

页数：3

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