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Open AccessExponentially selective molecular sieving through angstrom pores
Two-dimensional crystals with angstrom-scale pores are widely considered as candidates for a next generation of molecular separation technologies aiming to provide extreme, exponentially large selectivity comb...
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Capillary condensation under atomic-scale confinement
Capillary condensation of water is ubiquitous in nature and technology. It routinely occurs in granular and porous media, can strongly alter such properties as adhesion, lubrication, friction and corrosion, an...
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Article
Limits on gas impermeability of graphene
Despite being only one-atom thick, defect-free graphene is considered to be completely impermeable to all gases and liquids1–10. This conclusion is based on theory3–8 and supported by experiments1,9,10 that could...
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Ballistic molecular transport through two-dimensional channels
Gas permeation through nanoscale pores is ubiquitous in nature and has an important role in many technologies1,2. Because the pore size is typically smaller than the mean free path of gas molecules, the flow of t...
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Ultrathin graphene-based membrane with precise molecular sieving and ultrafast solvent permeation
Highly laminar graphene oxide flakes (10 to 20 μm in diameter) are fabricated. Reducing flake thickness to 10 nm enables water and organic solvent permeation, enabling the flakes to act as a highly effective o...
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Molecular transport through capillaries made with atomic-scale precision
Nanometre-scale graphitic capillaries with atomically flat walls are engineered and studied, revealing unexpectedly fast transport of liquid water through channels that accommodate only a few layers of water.
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Wang et al. reply
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Symptômes neurologiques du bord latéral du pied et de la cheville
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Open AccessTemperature-Dependent Asymmetry of Anisotropic Magnetoresistance in Silicon p-n Junctions
We report a large but asymmetric magnetoresistance in silicon p-n junctions, which contrasts with the fact of magnetoresistance being symmetric in magnetic metals and semiconductors. With temperature decreasing f...
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Square ice in graphene nanocapillaries
The structure of the low-dimensional water confined in hydrophobic pores is shown, using electron microscopy and supported by molecular dynamics simulations, to be ‘square ice’, which does not have the convent...
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Proton transport through one-atom-thick crystals
Measurements show that monolayers of graphene and hexagonal boron nitride are unexpectedly highly permeable to thermal protons and that their conductivity rapidly increases with temperature, but that no proton...
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L’électroneuromyographie dans la pathologie de la face dorsale du pied
L’anatomie et l’électroneuromyographie (ENMG) sont intimement liées. Dans cette mise au point, consacrée à l’ENMG de la face dorsale du pied, nous envisagerons systématiquement l’anatomie, pour chaque tronc ne...
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Article
Effect of Strain Rate on Plastic Flow in Zr-Based Metallic-Glass-Reinforced Porous Tungsten Matrix Composites
The rate-dependent deformation of Zr38Ti17Cu10.5Co12Be22.5 bulk metallic-glass-reinforced porous tungsten matrix composites was investigated over a wide range of strain rates. The composites were examined in two ...
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Microstructure and Electrochemical Behavior of Fe-Based Amorphous Metallic Coatings Fabricated by Atmospheric Plasma Spraying
A Fe48Cr15Mo14C15B6Y2 alloy with high glass forming ability (GFA) was selected to prepare amorphous metallic coatings by atmospheric plasma spraying (APS). The as-deposited coatings present a dense layered struct...
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Microstructure and Wear Resistance of Fe-Based Amorphous Metallic Coatings Prepared by HVOF Thermal Spraying
Amorphous metallic coatings with a composition of Fe48Cr15Mo14C15B6Y2 were fabricated by means of high velocity oxygen fuel (HVOF) thermal spraying process. The microstructure and wear performance of the coatings...
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Thiocyanate-selective electrode based on N-salicylidene-benzylamineato copper(II) complex
Highly selective poly(vinyl chloride) (PVC) membrane electrode based on N-salicylidene-benzylamineato copper(II) complexes [Cu(SBA)2] as new carriers towards thiocyanate-selective electrode was reported. The infl...
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Lift -Off Process to get Free-Standing High Quality Single Crystal Diamond Films and Suspended Single Crystal Diamond Devices
Freestanding and suspended single crystal diamond devices, micro disks and beam structures, have been fabricated on single crystal diamond substrates using a lift-off process employing ion implantation followe...
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Chemiluminescence flow system for the determination of Fe(II) and Fe(III) in water
A novel chemiluminescence (CL) flow system has been developed for the sequential determination of Fe(II) and Fe(III) in water. Fe(II) was detected by its catalytic effect on the CL reaction between luminol im...
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Dynamics of intertidal marshes near shallow estuaries in Louisiana
A three-year (1991–1993) field investigation was conducted to quantify the hydrodynamics of intertidal marshes adjacent to tidal channels and shallow bays within two Louisiana coastal regions: (1) the sediment...
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Glycogen Production from Glucose with Desoxycorticosterone and 11-Dehydro- 17-hydroxycorticosterone
IT is often said that the different corticosteroids have qualitatively different activities. Desoxycorticosterone is believed to act only on electrolyte metabolism, while 11-dehydro-17-hydroxycorticosterone (c...