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PubMed Journals Articles About "Understanding Transport Behavior Through Layer Graphene Oxide Membranes" RSS

11:01 EST 17th January 2020 | BioPortfolio

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Showing "Understanding Transport Behavior through Layer Graphene Oxide Membranes" PubMed Articles 1–25 of 23,000+

Understanding Gas Transport Behavior through Few-Layer Graphene Oxide Membranes Controlled by Tortuosity and Interlayer Spacing.

Here, we elucidate the gas transport behavior through few-layer graphene oxide membranes (FGOMs) that have a systematically controlled diffusion pathway, including tortuosity and channel width. The obtained unusual gas permeation order (especially, CH > O > N) of the FGOM provides strong evidence that gas molecules can indeed penetrate through the empty voids created by horizontally assembled GO, which allows selective gas transport features. These unique transport features of the FGOM originate from its co...


Mixed Nanosheet Membranes Assembled from Chemically Grafted Graphene Oxide and Covalent Organic Frameworks for Ultra-High Water Flux.

2D Graphene oxide (GO) membranes attract great attention due to ultrathin thickness and superior molecular sieving ability, but the low flux and instability in aqueous environments remain the major challenges for practical applications. In this study, we designed hybrid nanosheets from chemically grafted graphene oxide and -NH2 functionalized covalent organic frameworks (COFs) as building blocks to fabricate mixed nanosheet membranes. The GO-CTF membranes show layered configuration of ca. 32 nm thickness wi...

Roll-to-roll graphene oxide radon barrier membranes.

Graphene oxide as a radon barrier in living environments was introduced by intercalating the polymer resin-coated layer inside a multilayer membrane with an area of 1 × 10 m and a thickness of 2.5 mm, prepared by the roll-to-roll method. A 5 μm-thick graphene oxide polymer resin (GOPR) layer was coated on polyethylene terephthalate (PET) film (100 μm) between the two styrene-butadiene-styrene (SBS)-modified bitumen asphalt layers fitted for construction sites. The inserted graphene oxide mate...


Graphene oxide nanoslits confined AgBF4/Ionic liquid for efficiently separating olefin from paraffin.

Facilitated transport membrane for separating light olefins, using transition metals like silver and copper as carriers, is promising to replace those traditional energy-consumption methods. Here, we construct ionic liquid filled the nanoslits of laminated graphene oxide membrane with silver ions as carrier to separate ethylene/ethane. The nanoslits of graphene oxide membrane efficiently prevents the loss of silver ions ionic liquid solution. The ionic liquid further slows down the reduction of silver ions....

Control of Edge/In-Plane Interactions toward Robust, Highly Proton Conductive Graphene Oxide Membranes.

Graphene oxide (GO) membrane, bearing well-aligned interlayer nanochannels and well-defined physicochemical properties, promises fast proton transport. However, the deficiency of proton donor groups on the basal plane of GO and weak interlamellar interactions between the adjacent nanosheets often cause the low proton conduction capability and poor water stability. Herein, we incorporate the sulfonated graphene quantum dots (SGQD) into graphene oxide (GO) membrane to solve the above dilemma via synergistical...

Analytical Prediction of Gas Permeation through Graphene Nanopores of Varying Sizes: Understanding Transitions across Multiple Transport Regimes.

Nanoporous graphene is a promising candidate material for gas separation membranes, due to its atomic thickness and low cross-membrane transport resistance. The mechanisms of gas permeation through graphene nanopores, in both the large and small pore size limits, have been reported in the literature. However, mechanistic insights into the crossover from the small pore size limit to the large pore size limit are still lacking. In this study, we develop a comprehensive theoretical framework to predict gas per...

Preparation of a hydrophilic and antibacterial dual function ultrafiltration membrane with quaternized graphene oxide as a modifier.

In order to improve the anti-biofouling performance of ultrafiltration membrane, quaternized graphene oxide (QGO) was synthesized as a membrane modifier by in-situ growth of quaternary ammonium salt on the graphene oxide surface. A hydrophilic and antibacterial dual functional membrane was prepared with this kind of modifiers by immersion phase inversion method. The modified membrane obviously exhibits enhanced hydrophilicity, antibacterial and mechanical properties than the unmodified Polyvinylidene fluori...

Enhanced covalent p-phenylenediamine crosslinked graphene oxide membranes: Towards superior contaminant removal from wastewaters and improved membrane reusability.

The increasing depletion of freshwater necessitates the re-use and purification of wastewaters. Among the existing separation membrane materials, graphene oxide (GO) is a promising candidate, owing to its tunable physicochemical properties. However, the widening of GO membranes pore gap in aqueous environments is a major limitation. Crosslinking agents can be incorporated to alleviate this problem. This study describes a comparative analysis of uncrosslinked and p-Phenylenediamine (PPD) crosslinked GO membr...

Room-temperature transport properties of graphene with defects derived from oxo-graphene.

In recent years graphene oxide has been considered as a soluble precursor of graphene for electronic applications. However, the performance lacks behind that of graphene due to lattice defects. Here, we quantitatively studied the relation between the density of defects in the range of 0.2% and 1.5% and the transport properties. Therefore, the related flakes of monolayers of graphene were prepared from oxo-functionalized graphene (oxo-G). The morphologic structure of oxo-G was imaged by atomic force microsco...

Adapting aluminum doped zinc oxide for electrically conductive membranes fabricated by atomic layer deposition.

The use of electrically conductive membranes has recently drawn great interest in water treatment as an approach to reduce biofouling. Most conductive membranes are made by binding nanoparticles (carbon nanotubes or graphene) to a polymeric membrane using additional polymers, but this method risks leaching these nanomaterials into the environment. A new approach was developed here based on producing an electrically conductive layer of aluminum doped zinc oxide (AZO) by atomic layer deposition. The aqueous i...

Tunable Anion Selective Transport through Mono-Layer Graphene and Hexagonal Boron Nitride.

Membranes that filter selectively for both anions and cations are central to technological applications from clean energy generation to desalination devices. 2D materials have immense potential as these ion selective membranes, due to their thinness, mechanical strength and tunable surface chemistry. However, currently only cation selective membranes have been reported. Here, we demonstrate controllable cation and anion selectivity of both mono-layer graphene and hexagonal boron nitride. In particular, we m...

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene.

A deep comprehension of the local anodic oxidation process in 2D materials is achieved thanks to an extensive experimental and theoretical study of this phenomenon in graphene. This requires to arrange a novel instrumental device capable to generate separated regions of monolayer graphene oxide (GO) over graphene, with any desired size, from micrometers to unprecedented mm , in minutes, a milestone in GO monolayer production. GO regions are manufactured by overlapping lots of individual oxide spots of thous...

RECONFIGURABLE HORIZONTAL-VERTICAL CARRIER TRANSPORT IN GRAPHENE/HfZrO FIELD-EFFECT TRANSISTORS.

We have fabricated at wafer level field-effect-transistors (FETs) having as channel graphene monolayers transferred on a HfZrO ferroelectric, grown by atomic layer deposition on a doped Si (100) substrate. These FETs display either horizontal or vertical carrier transport behavior, depending on the applied gate polarity. In one polarity, the FETs behave as a graphene FET where the transport is horizontal between two contacts (drain and grounded source) and is modulated by a back-gate. Changing the polarity,...

Ultrafast-selective nanofiltration of a hybrid membrane comprising laminated reduced graphene oxide/graphene oxide nanoribbons.

In this study, reduced graphene oxide (rGO) and graphene oxide nanoribbon (GONR) are used to fabricate a composite membrane that exhibits ultrafast water permeance (312.8 L m h bar) and precise molecular separation (molecular weight cutoff: 269 Da), which surpass the upper bound of previously reported polymer and graphene-based nanofiltration membranes. As two-dimensional GONR exhibits a width on the scale of nanometers, its nanochannels can be enlarged without hindering the stacking of rGO. Moreover, abund...

Graphene-based nano composites and their applications. A review.

The purpose of the current review article is to present a comprehensive understanding regarding pros and cons of graphene related nanocomposites and to find ways in order to improve the performance of nanocomposites with new designs. Nanomaterials including GR are employed in industrial applications such as supercapacitors, biosensors, solar cells, and corrosion studies. The present article has been prepared in three main categories. In the first part, graphene types have been presented, as pristine graphen...

Reduced Holey Graphene Oxide Membranes for Desalination with Improved Water Permeance.

Reduced-graphene oxide (r-GO) membranes with narrow channels exhibit salt rejections comparable to conventional nanofiltration (NF) membranes. However, their water permeances are much lower because of the high tortuosity for water permeation. Herein we report a facile solution-processable approach to create in-plane nanopores on GO nanosheets before reduction, dramatically decreasing the tortuosity and increasing water permeance while retaining the salt rejection. Specifically, holey GO (HGO) nanosheets wer...

Laminar Graphene Oxide Membranes Towards Selective Ionic and Molecular Separations: Challenges and Progress.

Resolution of resources and environmental crises requires an efficient separation technologies, consequently, scientists and engineers are working vigorously for ideal separation materials. Laminar graphene oxide (GO) is a two-dimensional (2D) material offers considerable interest in this field due to its single atomic layer thickness, good stability, chemical inertness, and variety of functional groups. Recently, GO have emerged as a novel membrane material for molecular and ionic separation of gases, solv...

Mineralisation and release of 14C-graphene oxide (GO) in soils.

Graphene-based nanomaterials (GNMs) have been touted as miracle materials due to their extraordinary properties that can benefit many industries, including in agriculture and for environmental remediation. While improvement in nutrient delivery and the ability to adsorb environmental contaminants have been demonstrated, what happens to GNMs in soil is a question that has not been addressed. The main aim of this study was to investigate their degradation in soil to have a better understanding of their enviro...

Nonuniversal Transverse Electron Mean Free Path through Few-layer Graphene.

In contrast to the in-plane transport electron mean-free path in graphene, the transverse mean-free path has received little attention and is often assumed to follow the "universal" mean-free path (MFP) curve broadly adopted in surface and interface science. Here we directly measure transverse electron scattering through graphene from 0 to 25 eV above the vacuum level both in reflection using low energy electron microscopy and in transmission using electronvolt transmission electron microscopy. From these ...

Hydrothermal fabrication of sandwich-structured Silver sulfide/ferroferric oxide/silver metavanadate graphene microtube using capillary effect for enhancing photocatalytic degradation and disinfection.

As photocatalyst the low recombination efficiency and efficient utilization of photoelectron-holes are crucial for high photodegradation efficiencies, rapid disinfection in water catalytic purification. Herein, a sandwich-structured Z-scheme Silver sulfide/ferroferric oxide/silver metavanadate graphene microtube composite photocatalyst (AgS/FeO/AgVO@GM) was successfully prepared by a novel strategy using capillary effect combined with hydrothermal method. In this sandwich-structured composite, AgS, FeO and ...

Effects of ultrasonication duration and graphene oxide and nano-zinc oxide contents on the properties of polyvinyl alcohol nanocomposites.

Nanofibrous composite membranes consisting of polyvinyl alcohol (PVA), graphene oxide (GO), and zinc oxide nanoparticles (ZnO NPs) were prepared by and ultrasonic processing, and electrospinning. The performance of the membranes containing different GO-to-ZnO NP mass ratios was comprehensively investigated in terms of density, mechanical properties, water vapor permeability, optical property, biodegradability and antimicrobial properties. The results showed that an appropriate sonication time (30 min) imp...

Controllably boron-doped epitaxial graphene grown by thermal decomposition of a B4C thin film.

We show that boron-doped epitaxial graphene was successfully grown by thermal decomposition of a boron carbide thin film, which was also epitaxially grown on the silicon carbide substrate. The interfaces of B4C on SiC and graphene on B4C had a fixed orientation relation, having the local stable structure with no dangling bonds. The first carbon layer on B4C acts as a buffer layer, and the overlaying carbon layers are graphene. Graphene on B4C was highly boron-doped, and the hole concentration could be contr...

Ultrafast Unbalanced Electron Distributions in Quasicrystalline 30° Twisted Bilayer Graphene.

Ultrafast carrier dynamics in a graphene system are very important in terms of optoelectronic devices. Recently, a twisted bilayer graphene has been discovered that possesses interesting electronic properties owing to strong modifications in interlayer couplings. Thus, a better understanding of ultrafast carrier dynamics in a twisted bilayer graphene is highly desired. Here, we reveal the unbalanced electron distributions in a quasicrystalline 30° twisted bilayer graphene (QCTBG), using time- and angle-res...

Multifunctional Thin Film Nanofiltration Membrane Incorporated with Reduced Graphene Oxide@TiO2@Ag Nanocomposites for High Desalination Performance, Dye Retention, and Antibacterial Properties.

High desalination performance, dyes retention, and antibacterial properties were achieved with a multifunctional thin film nanocomposite (MTFN) membrane, fabricated by the incorporation of a novel nanocomposite structure of reduced graphene oxide@TiO2@Ag (rGO@TiO2@Ag) into the polyamide active layer. The specific characteristics of graphene-based nanocomposite, synthesized by microwave-assisted irradiation process, favored water channelization and provided super-hydrophilicity and antibacterial properties t...

Adsorption of Cr(III) and Pb(II) by graphene oxide/alginate hydrogel membrane: Characterization, adsorption kinetics, isotherm and thermodynamics studies.

Graphene oxide/alginate hydrogel membranes (GAHMs) were prepared by cross-linking a casting solution (blending graphene oxide, sodium alginate and urea) with a calcium chloride solution. The adsorption performance and mechanism for the removel of Cr(III) and Pb(II) were investigated. The GAHMs, before and after adsorption, were characterized by FT-IR, SEM, EDX and XPS, and their hydrophilicity was determined. The kinetics, isotherm and thermodynamics models were introduced. Results indicated that the optima...


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