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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TLDR
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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MXene-Carbon Nanotube Hybrid Membrane for Robust Recovery of Au from Trace-Level Solution
Chunmei Wang,Chunmei Wang,Renfei Cheng,Renfei Cheng,Peng-Xiang Hou,Peng-Xiang Hou,Yonghui Ma,Abdul Majeed,Xiaohui Wang,Xiaohui Wang,Chang Liu,Chang Liu +11 more
TL;DR: A sandwiched Ti3C2Tx MXene/carbon nanotube (CNT) hybrid membrane, where the CNT isolates and supports the MXene sheets which act as a reducing agent, shows excellent ability to capture precious metal ions in solution with a high flux.
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Facile tailoring of the two-dimensional graphene oxide channels for gas separation
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Nonlinear Viscous Water at Nanoporous Two-Dimensional Interfaces Resists High-Speed Flow through Cooperativity
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Laminar Graphene Oxide Membranes Towards Selective Ionic and Molecular Separations: Challenges and Progress
TL;DR: This tutorial review aims to discuss the various approaches used to control the stacking of GO-based membrane with emphasis of advantages and drawbacks associated with each approach and the recent progress in GO based membranes for ionic and molecular separations.
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Unexpectedly Enhanced Solubility of Aromatic Amino Acids and Peptides in an Aqueous Solution of Divalent Transition-Metal Cations.
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