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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Water transport through graphene oxide membranes: the roles of driving forces
TL;DR: Water transport in GO membranes was tested under two different modes: pressure-driven permeation and pervaporation and the pure water flux was found to be 1-2 orders of magnitude higher in pervapation due to the large capillary pressure induced by evaporation.
Journal ArticleDOI
Tailoring permeation channels of graphene oxide membranes for precise ion separation
Zhiqian Jia,Weixing Shi +1 more
TL;DR: In this paper, a method for tuning the permeation channels of graphene oxide (GO) membranes is developed, in which the basal planes and edges of GO flakes are simultaneously crosslinked by dicarboxylic acid and diamine.
Journal ArticleDOI
Fabrication and morphology tuning of graphene oxide nanoscrolls
TL;DR: In this paper, the authors reported the synthesis of graphene oxide nanoscrolls (GONS) with tunable dimensions via low and high frequency ultrasound solution processing techniques, which can be visualized as a graphene oxide sheet rolled into a spiral-wound structure and represent an alternative to traditional carbon nano-morphologies.
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Expanded Porphyrins as Two-Dimensional Porous Membranes for CO2 Separation.
TL;DR: It is shown that porphyrin systems could offer an attractive bottom-up approach for 2D porous membranes and high ideal selectivity on the order of 10(6) for CO2/N2 separation through extended 2D membranes based on amethyrin derivatives is shown.
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Catalytically Active Bacterial Nanocellulose-Based Ultrafiltration Membrane
Ting Xu,Qisheng Jiang,Deoukchen Ghim,Keng-Ku Liu,Hongcheng Sun,Hamed Gholami Derami,Zheyu Wang,Sirimuvva Tadepalli,Young-Shin Jun,Qinghua Zhang,Srikanth Singamaneni +10 more
TL;DR: A novel membrane based on bacterial nanocellulose (BNC) loaded with graphene oxide (GO) and palladium (Pd) nanoparticles is demonstrated, which exhibits highly efficient methylene orange (MO) degradation during filtration.
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.