Precise and Ultrafast Molecular Sieving Through Graphene Oxide Membranes
Rakesh Joshi,Paola Carbone,FengChao Wang,Vasyl G. Kravets,Yang Su,Irina V. Grigorieva,HengAn Wu,Andre K. Geim,Rahul R. Nair +8 more
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This work investigates permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions, which reveal that the GO membrane can attract a high concentration of small ions into the membrane, which may explain the fast ion transport.Abstract:
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.read more
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Strained single-layer C2N membrane for efficient seawater desalination via forward osmosis: A molecular dynamics study
TL;DR: In this article, molecular dynamics simulations have been conducted to investigate the seawater desalination performance of the single-layer C2N membrane in the forward osmosis (FO) process by tuning its pore size using tensile strain.
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Electric-Field-Induced Ionic Sieving at Planar Graphene Oxide Heterojunctions for Miniaturized Water Desalination.
Qi Wen,Pan Jia,Liuxuan Cao,Jipeng Li,Di Quan,Lili Wang,Yanbing Zhang,Diannan Lu,Lei Jiang,Wei Guo +9 more
TL;DR: A planar heterogeneous graphene oxide membrane (PHGOM) with both nearly perfect salt rejection and high water flux is reported, and horizontal ion transport through oppositely charged GO multilayer lateral heterojunction exhibits bi-unipolar transport behavior.
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Tailoring the microstructure of poly(vinyl alcohol)-intercalated graphene oxide membranes for enhanced desalination performance of high-salinity water by pervaporation
TL;DR: In this article, the authors proposed an efficient and stable desalination performance of laminated graphene oxide (Laminated GO) membrane is promising due to allowing unimpeded water permeation through the tunable interlayer nanochannels.
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Intrinsic high water/ion selectivity of graphene oxide lamellar membranes in concentration gradient-driven diffusion
Pengzhan Sun,Pengzhan Sun,Renzhi Ma,Hui Deng,Zhigong Song,Zhen Zhen,Kunlin Wang,Takayoshi Sasaki,Zhi Ping Xu,Hongwei Zhu +9 more
TL;DR: A combined experimental and molecular dynamics simulation study shows that intrinsic high water/ion selectivity of graphene oxide lamellar membrane was achieved in concentration gradient-driven diffusion, showing great promise in water desalination.
References
More filters
Journal ArticleDOI
Fast parallel algorithms for short-range molecular dynamics
TL;DR: In this article, three parallel algorithms for classical molecular dynamics are presented, which can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors.
Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Journal ArticleDOI
Molecular dynamics with coupling to an external bath.
TL;DR: In this paper, a method is described to realize coupling to an external bath with constant temperature or pressure with adjustable time constants for the coupling, which can be easily extendable to other variables and to gradients, and can be applied also to polyatomic molecules involving internal constraints.
Journal ArticleDOI
A smooth particle mesh Ewald method
TL;DR: It is demonstrated that arbitrary accuracy can be achieved, independent of system size N, at a cost that scales as N log(N), which is comparable to that of a simple truncation method of 10 A or less.