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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Cross-Linked Graphene Membrane for High-Performance Organics Separation of Emulsions
Guofeng Li,Xing Wang,Lei Tao,Yongsan Li,Kecheng Quan,Yen Wei,Lifeng Chi,Lifeng Chi,Qipeng Yuan +8 more
TL;DR: In this paper, a cross-linked graphene (CG) membrane is fabricated through compressing and then reducing a crosslinked GO aerogel, which achieved high performance of organics separation with high flux (225 lm−m−2 lh−1) and purity (>99.98%) even in a crossflow separation model, where water was intercepted.
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CO2/N2 selectivity enhancement of PEBAX MH 1657/Aminated partially reduced graphene oxide mixed matrix composite membrane
Shawqi Ali Mohammed,A. Nasir,Farhana Aziz,G. Kumar,W. Sallehhudin,Juhana Jaafar,Woei Jye Lau,Norhaniza Yusof,Wan Norharyati Wan Salleh,Ahmad Fauzi Ismail +9 more
TL;DR: In this article, a mixed matrix composite membrane (MMCM) fabricated using polyether block amide polymer PEBAX MH1657 from Arkema and in lab synthesized aminated partially reduced graphene oxide (A-prGO) nanofiller as a selective layer has been studied for gas separation.
Journal ArticleDOI
Pore channel surface modification for enhancing anti-fouling membrane distillation
TL;DR: In this article, the authors applied a novel method of preparing anti-fouling membranes for membrane distillation by dispersing graphene oxide (GO) on the channel surface of polyvinylidene fluoride membranes.
Journal ArticleDOI
Study on the separation performance of the multi-channel reduced graphene oxide membranes
Yongjiao Zhao,Chun Li,Xiaoyan Fan,Jiesheng Wang,Guang Yuan,Xinxiang Song,Jing Chen,Zhangde Li +7 more
TL;DR: In this paper, a multi-channel reduced graphene oxide membranes with separation function have been synthesized by a simple hydrothermal reduction method and vacuum filtration, where the size, number, and type of the nanochannels can be controlled by the reduced temperature.
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Labyrinthine water flow across multilayer graphene-based membranes: molecular dynamics versus continuum predictions
Hiroaki Yoshida,Lydéric Bocquet +1 more
TL;DR: In this article, the authors investigated the hydrodynamic permeance of water through graphene-based membranes, inspired by recent experimental findings on graphene-oxide membranes, and compared results for the permeability obtained by means of molecular dynamics simulations to continuum predictions obtained by using the lattice Boltzmann calculations and hydrodynamics modelization.
References
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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.