1,430 results match your criteria nanoporous membrane

Crumpled Globule-Heterotextured Polyamide Membrane Interlayered with Protein-Polyphenol Nanoaggregates for Enhanced Forward Osmosis Performance.

ACS Appl Mater Interfaces 2022 May 20. Epub 2022 May 20.

College of Chemistry and Environmental Engineering, Shenzhen University, 1066 Xueyuan Boulevard, Shenzhen 518055, People's Republic of China.

Surface modulation of polyamide structures and the development of nanochanneled membranes with excellent water transport properties are crucial for the separation performance enhancement of thin-film composite membranes. Here, we demonstrate the fabrication of a modular nanochannel-integrated polyamide network on a nanoporous interlayer membrane comprising Mxene-reinforced protein-polyphenol nanoaggregates. The research indicates that the confined growth of the polyamide matrix inside this hydrophilic sub-10 nm nanochannel nanoporous intermediate layer stiffened the interfacial channels, leading to the formation of a polyamide layer with a spatial distribution of a network of unique 3D crumpled globule-like nanostructures. Read More

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Simulation of Water Flow in a Nanochannel with a Sudden Contraction or Expansion.

Langmuir 2022 May 18. Epub 2022 May 18.

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China.

Water flow in a nanoscale channel is known to be affected by strong water-wall interactions; as a result, the flow considerably deviates from the conventional continuum flow. Nanochannel with a sudden contraction or expansion is the most fundamental morphological nanostructure in many nanoporous systems such as shale matrix, mudrock, membrane, etc. However, the nanoconfinement effects of water flow in nanoporous systems and its effect on macroscopic flow behavior are still evolving research topics. Read More

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Nanoporous and nano thickness film-forming bioactive composition for biomedical applications.

Sci Rep 2022 May 17;12(1):8198. Epub 2022 May 17.

Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.

Unmanageable bleeding is one of the significant causes of mortality. Attaining rapid hemostasis ensures subject survivability as a first aid during combats, road accidents, surgeries that reduce mortality. Nanoporous fibers reinforced composite scaffold (NFRCS) developed by a simple hemostatic film-forming composition (HFFC) (as a continuous phase) can trigger and intensify hemostasis. Read More

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Functionalized MOF-Derived Nanoporous Carbon as Compatible Nanofiller to Fabricate Defect-Free PDMS-Based Mixed Matrix Pervaporation Membranes.

ACS Omega 2022 May 26;7(18):15786-15794. Epub 2022 Apr 26.

Center for Membrane and Water Science & Technology, Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, 310014 Hangzhou, China.

Metal-organic framework (MOF)-based polydimethylsiloxane mixed matrix membranes applied for alcohol recovery with high permeability and selectivity are drawing more and more attention. However, the design and fabrication of high-quality and stable MOF-based mixed matrix membrane for pervaporation are still a big challenge. Herein, PDMS functionalized MOF-derived nanoporous carbon (P-ZNC) was first explored as compatible nanofiller to mutually blend with polydimethylsiloxane on PVDF substrate to fabricate defect-free mixed matrix membranes via dip-coating and thermal cross-linkng. Read More

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Aluminum Diethylphosphinate-Incorporated Flame-Retardant Polyacrylonitrile Separators for Safety of Lithium-Ion Batteries.

Polymers (Basel) 2022 Apr 19;14(9). Epub 2022 Apr 19.

Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea.

Herein, we developed polyacrylonitrile (PAN)-based nanoporous composite membranes incorporating aluminum diethylphosphinate (ADEP) for use as a heat-resistant and flame-retardant separator in high-performance and safe lithium-ion batteries (LIBs). ADEP is phosphorus-rich, thermally stable, and flame retardant, and it can effectively suppress the combustibility of PAN nanofibers. Nanofibrous membranes were obtained by electrospinning, and the content of ADEP varied from 0 to 20 wt%. Read More

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Efficient Screening of Pesticide Diazinon-Binding Aptamers Using the Sol-Gel-Coated Nanoporous Membrane-Assisted SELEX Process and Next-Generation Sequencing.

Appl Biochem Biotechnol 2022 May 12. Epub 2022 May 12.

Research Group of Consumer Safety, Research Division of Strategic Food Technology, Korea Food Research Institute, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea.

Aptamer-based methods for detecting pesticides are more efficient than antibody-based methods by high thermal stability, low molecular weight, easy modification, and low cost. In this study, the systematic evolution of ligands by exponential enrichment (SELEX) process, combined with next-generation sequencing (NGS), was performed to select aptamers specific to the pesticide, diazinon, which was fixed on a sol-gel-coated nanoporous-anodized aluminum oxide membrane to overcome the immobilization effect of general method and simplify the elution step. The frequency of specific nucleotide sequences obtained after SELEX rounds was directly analyzed using NGS to eliminate the time-consuming cloning process used in the general SELEX methods. Read More

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Thermal and mechanical characterization of nanoporous two-dimensional MoS membranes.

Sci Rep 2022 May 11;12(1):7777. Epub 2022 May 11.

Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 807, Taiwan.

For practical application, determining the thermal and mechanical characterization of nanoporous two-dimensional MoS membranes is critical. To understand the influences of the temperature and porosity on the mechanical properties of single-layer MoS membrane, uniaxial and biaxial tensions were conducted using molecular dynamics simulations. It was found that Young's modulus, ultimate strength, and fracture strain reduce with the temperature increases. Read More

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Gas Adsorption in Zeolite and Thin Zeolite Layers: Molecular Simulation, Experiment, and Adsorption Potential Theory.

Langmuir 2022 May 29;38(18):5428-5438. Epub 2022 Apr 29.

Université Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.

Molecular simulations and experiments are used to investigate methane adsorption in bulk and thin layers of MFI zeolite (silicalite-1). After comparing the theoretical adsorption data obtained using Grand Canonical Monte Carlo simulations for bulk MFI at various temperatures against experiments, zeolite layers with different crystalline orientations and levels of surface flexibility are considered. The data obtained for such prototypical systems allow us to rationalize both the qualitative and quantitative impact of external surface in nanoporous solids. Read More

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Microscopic Insight into Water Desalination through Nanoporous Graphene: The Influence of the Dipole Moment.

J Phys Chem Lett 2022 May 29;13(18):4029-4035. Epub 2022 Apr 29.

Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

Nanoporous graphene membranes with controllable pore size and chemical functionality may be one of the most desirable materials for water desalination. Herein, we investigate desalination performance of hydrogen-functionalized nanoporous graphene membranes. The charge values on hydrogen atoms () and carbon atoms at the pore rim are systematically adjusted. Read More

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Structural Engineering of the Barrier Oxide Layer of Nanoporous Anodic Alumina for Iontronic Sensing.

ACS Appl Mater Interfaces 2022 May 29;14(18):21181-21197. Epub 2022 Apr 29.

School of Chemical Engineering and Advanced Materials, The University of Adelaide, South Australia 5005, Adelaide, Australia.

The hemispherical barrier oxide layer (BOL) closing the bottom tips of hexagonally distributed arrays of cylindrical nanochannels in nanoporous anodic alumina (NAA) membranes is structurally engineered by anodizing aluminum substrates in three distinct acid electrolytes at their corresponding self-ordering anodizing potentials. These nanochannels display a characteristic ionic current rectification (ICR) signal between high and low ionic conduction states, which is determined by the thickness and chemical composition of the BOL and the pH of the ionic electrolyte solution. The rectification efficiency of the ionic current associated with the flow of ions across the anodic BOL increases with its thickness, under optimal pH conditions. Read More

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A facile template-assisted electrodeposition approach to porous Cu/CuO nanowires.

RSC Adv 2021 Sep 10;11(48):30215-30221. Epub 2021 Sep 10.

Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University Dalian 116028 P. R. China

Although nanoporous materials have been fabricated by electrodeposition using micelles of P-123 as structure-directing entities, the possible geometry obtained has been limited to nanoporous films. Herein, a novel dual-template assisted electrodeposition method to fabricate Cu/CuO porous nanowires (PNs) using polymeric micelles as a soft template and polycarbonate membranes as a hard template is reported. These nanowires consist of a porous skeleton with nanosized pores of 20 nm on average and crystallized ligaments. Read More

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September 2021

Architecting Braided Porous Carbon Fibers Based on High-Density Catalytic Crystal Planes to Achieve Highly Reversible Sodium-Ion Storage.

Adv Sci (Weinh) 2022 Apr 26:e2104780. Epub 2022 Apr 26.

State Key Laboratory of Separation Membrane and Membrane Processes, Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, School of Materials Science and Engineering, School of Electronic and Information Engineering, School of Mechanical Engineering, Tiangong University, Tianjin, 300387, China.

Carbonaceous materials are considered strong candidates as anode materials for sodium-ion batteries (SIBs), which are expected to play an indispensable role in the carbon-neutral era. Herein, novel braided porous carbon fibres (BPCFs) are prepared using the chemical vapour deposition (CVD) method. The BPCFs possess interwoven porous structures and abundant vacancies. Read More

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Adhesion response of filopodia to an AFM lateral detachment force and functional changes after centrifugation of cells grown on nanoporous titanium.

Mater Today Bio 2022 Mar 4;14:100250. Epub 2022 Apr 4.

Laboratory for the Study of Calcified Tissues and Biomaterials, Department of Stomatology, Faculty of Dental Medicine, Université de Montréal, Montréal, Québec H3C3J7, Canada.

Cells sense and respond to mechanical cues from the surrounding substrate through filopodia. Regulation of cellular biomechanics operates at the nanoscale. Therefore, a better understanding of the relationship between filopodia and nanoscale surface features is highly relevant for the rational design of implant surfaces. Read More

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PNP Nanofluidic Transistor with Actively Tunable Current Response and Ionic Signal Amplification.

Nano Lett 2022 05 20;22(9):3678-3684. Epub 2022 Apr 20.

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China.

Inspired by electronic transistors, electric field gating has been adopted to manipulate ionic currents of smart nanofluidic devices. Here, we report a PNP nanofluidic bipolar junction transistor (nBJT) consisting of one polyaniline (PANI) layer sandwiched between two polyethylene terephthalate (PET) nanoporous membranes. The PNP nBJT exhibits three different responses of currents (quasi-linear, rectification, and sigmoid) due to the counterbalance between surface charge distribution and base voltage applied in the nanofluidic channels; thus, they can be switched by base voltage. Read More

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How chemical defects influence the charging of nanoporous carbon supercapacitors.

Proc Natl Acad Sci U S A 2022 Apr 19;119(17):e2121945119. Epub 2022 Apr 19.

Laboratoire de Mécanique et Génie Civil, CNRS Université de Montpellier, 34090 Montpellier, France.

SignificanceNanoporous carbon texture makes fundamental understanding of the electrochemical processes challenging. Based on density functional theory (DFT) results, the proposed atomistic approach takes into account topological and chemical defects of the electrodes and attributes to them a partial charge that depends on the applied voltage. Using a realistic carbon nanotexture, a model is developed to simulate the ionic charge both at the surface and in the subnanometric pores of the electrodes of a supercapacitor. Read More

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Mechanical and thermal characterizations of nanoporous two-dimensional boron nitride membranes.

Sci Rep 2022 Apr 15;12(1):6306. Epub 2022 Apr 15.

Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 807, Taiwan.

Hexagonal boron nitride (h-BN) is a promising 2D material due to its outstanding mechanical and thermal properties. In the present study, we use molecular dynamics simulations to investigate the influence of porosity and temperature on the mechanical characteristics of h-BN based on uniaxial and biaxial tensions. Meanwhile, the progression of the microstructure of h-BN up to fracture is studied in order to clarify its fractures mechanism during the tension process. Read More

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Graphene oxide lamellar membrane with enlarged inter-layer spacing for fast preconcentration and determination of trace metal ions.

RSC Adv 2021 Mar 23;11(20):11889-11899. Epub 2021 Mar 23.

Department of Chemistry, College of Science, King Saud University Riyadh-11451 Saudi Arabia

We report a graphene oxide (GO) lamellar membrane with increased inter-layer spacing for efficient permeation of water molecules and heavy metal ions through nanoporous graphene oxide. The inter-layer spacing of the GO sheets in the lamellar structure was increased by introducing poly-aminophosphonic acid (APA) in between the GO sheets. We demonstrate experimentally, the use of a prepared membrane (GO-APA) by a SPE technique for the preconcentration and extraction of heavy metal ions by chelate formation and their determination by ICP-OES. Read More

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Electrical monitoring of infection biomarkers in chronic wounds using nanochannels.

Biosens Bioelectron 2022 Aug 5;209:114243. Epub 2022 Apr 5.

NanoBioAnalysis Group - Department of Physical and Analytical Chemistry, University of Oviedo, Julián Clavería 8, 33006, Oviedo, Spain; Biotechnology Institute of Asturias, University of Oviedo, Santiago Gascon Building, 33006, Oviedo, Spain. Electronic address:

Chronic wounds represent an important healthcare challenge in developed countries, being wound infection a serious complication with significant impact on patients' life conditions. However, there is a lack of methods allowing an early diagnosis of infection and a right decision making for a correct treatment. In this context, we propose a novel methodology for the electrical monitoring of infection biomarkers in chronic wound exudates, using nanoporous alumina membranes. Read More

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Pushing the limits of nanopore transport performance by polymer functionalization.

Chem Commun (Camb) 2022 Apr 26;58(34):5188-5204. Epub 2022 Apr 26.

Macromolecular Chemistry, Smart Membranes, Technical University of Darmstadt, 64287 Darmstadt, Germany.

Inspired by the design and performance of biological pores, polymer functionalization of nanopores has emerged as an evolving field to advance transport performance within the last few years. This feature article outlines developments in nanopore functionalization and the resulting transport performance including gating based on electrostatic interaction, wettability and ligand binding, gradual transport controlled by polymerization as well as functionalization-based asymmetric nanopore and nanoporous material design going towards the transport direction. Pushing the limits of nanopore transport performance and thus reducing the performance gap between biological and technological pores is strongly related to advances in polymerization chemistry and their translation into nanopore functionalization. Read More

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Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances.

Adv Mater 2022 Apr 7:e2201472. Epub 2022 Apr 7.

Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Porous graphene and other atomically thin two-dimensional materials are regarded as highly promising membrane materials for high-performance gas separations due to their atomic thickness, large-scale synthesizability, excellent mechanical strength, and chemical stability. When these atomically thin materials contain a high areal density of gas sieving nanoscale pores, they can exhibit both high gas permeances and high selectivities, which is beneficial for reducing the cost of gas separation processes. In this review, we discuss recent modeling and experimental advances in nanoporous atomically thin membranes for gas separations. Read More

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Adhesive lift method for patterning arbitrary-shaped thin ion-selective films in micro/nanofluidic device.

Lab Chip 2022 May 3;22(9):1723-1735. Epub 2022 May 3.

Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea.

Micro/nanofluidic platforms with nanoporous films have been utilized as research tools for studying electrokinetic phenomena occurring not only in macro-scale systems such as electro-desalination but also in micro-scale systems such as bio-molecular preconcentrators. However, due to the limitations of fabrication techniques, studies with nanoporous films are mainly limited to vary the physicochemical properties of the films such as surface charge and pore size, despite the enormous effect of the membrane morphology on the phenomena that is to be expected. Therefore, we propose an economic and feasible nanofabrication method called the "adhesive lift method" for patterning thin arbitrarily-shaped nanoporous film to integrate it into micro/nanofluidic platforms. Read More

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Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering.

ACS Appl Mater Interfaces 2022 Apr 30;14(14):16558-16567. Epub 2022 Mar 30.

Photonics Laboratory, ETH Zürich, Zürich CH-8093, Switzerland.

Surface-enhanced Raman spectroscopy (SERS) demands reliable, high-enhancement substrates in order to be used in different fields of application. Here we introduce freestanding porous gold membranes (PAuM) as easy-to-produce, scalable, mechanically stable, and effective SERS substrates. We fabricate large-scale sub-30 nm thick PAuM that form freestanding membranes with varying morphologies depending on the nominal gold thickness. Read More

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Characterization of a Centrifugal Microfluidic Orthogonal Flow Platform.

Micromachines (Basel) 2022 Mar 20;13(3). Epub 2022 Mar 20.

Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.

To bring to bear the power of centrifugal microfluidics on vertical flow immunoassays, control of flow orthogonally through nanoporous membranes is essential. The on-disc approach described here leverages the rapid print-cut-laminate (PCL) disc fabrication and prototyping method to create a permanent seal between disc materials and embedded nanoporous membranes. Rotational forces drive fluid flow, replacing capillary action, and complex pneumatic pumping systems. Read More

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MOF-Derived Nanoporous Carbon Incorporated in the Cation Exchange Membrane for Gradient Power Generation.

Membranes (Basel) 2022 Mar 14;12(3). Epub 2022 Mar 14.

Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332, USA.

Ion exchange membranes (IEMs), as a part of the reverse electrodialysis (RED) system, play an important role in salinity gradient power (SGP) generation. Structure optimization of IEMs is critical to increase the power production by RED. In this work, metal organic framework (MOF)-derived nanoporous carbons (hollow zeolitic imidazolate framework (ZIF)-derived nanoporous carbons, HZCs) were incorporated in a sulfonated poly (2, 6-dimethyl-1,4-phenylene oxide) (sPPO) membrane to prepare an organic-inorganic nanocomposite cation exchange membrane (CEM). Read More

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Tunable organic solvent nanofiltration in self-assembled membranes at the sub-1 nm scale.

Sci Adv 2022 Mar 16;8(11):eabm5899. Epub 2022 Mar 16.

Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Organic solvent-stable membranes exhibiting strong selectivity and high permeance have the potential to transform energy utilization in chemical separation processes. A key goal is developing materials with uniform, well-defined pores at the 1-nm scale, with sizes that can be tuned in small increments with high fidelity. Here, we demonstrate a class of organic solvent-stable nanoporous membranes derived from self-assembled liquid crystal mesophases that display such characteristics and elucidate their transport properties. Read More

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Light-Enhanced Osmotic Energy Harvester Using Photoactive Porphyrin Metal-Organic Framework Membranes.

Angew Chem Int Ed Engl 2022 May 29;61(22):e202202698. Epub 2022 Mar 29.

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.

High ion selectivity and permeability, as two contradictory aspects for the membrane design, highly hamper the development of osmotic energy harvesting technologies. Metal-organic frameworks (MOFs) with ultra-small and high-density pores and functional surface groups show great promise in tackling these problems. Here, we propose a facile and mild cathodic deposition method to directly prepare crack-free porphyrin MOF membranes on a porous anodic aluminum oxide for osmotic energy harvesting. Read More

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Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles.

Nat Nanotechnol 2022 Apr 14;17(4):408-416. Epub 2022 Mar 14.

State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.

Optoelectronic effects differentiating absorption of right and left circularly polarized photons in thin films of chiral materials are typically prohibitively small for their direct photocurrent observation. Chiral metasurfaces increase the electronic sensitivity to circular polarization, but their out-of-plane architecture entails manufacturing and performance trade-offs. Here, we show that nanoporous thin films of chiral nanoparticles enable high sensitivity to circular polarization due to light-induced polarization-dependent ion accumulation at nanoparticle interfaces. Read More

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Non-magnetic and magnetically responsive support materials immobilized peroxidases for biocatalytic degradation of emerging dye pollutants-A review.

Int J Biol Macromol 2022 May 9;207:387-401. Epub 2022 Mar 9.

School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian 223003, China. Electronic address:

In recent years, the removal of hazardous pollutants from many industries has become a significant challenge for mankind as a growing number of contaminants, including a wide range of organic pollutants, synthetic dyes, and polycyclic aromatic hydrocarbons (PAHs), have inevitably led to an increased anthropogenic impact on the biosphere. Due to the complex aromatic structure, most synthetic dyes show resistance to degrade by the classical approaches, such as coagulation, flotation, adsorption, membrane process, and reverse osmosis. Enzyme-assisted biodegradation of pollutants offers an eco-friendlier and cost-effective alternative to remediate dyes, dyes-based effluents, other toxins, etc. Read More

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Control one-dimensional length of rectangular pore on graphene membrane for better desalination performance.

Nanotechnology 2022 Mar 25;33(24). Epub 2022 Mar 25.

School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China.

At present, there is a general contradiction between permeability and selectivity of reverse osmosis (RO) membranes for desalination; a membrane with higher water permeability will give a lower salt rejection or selectivity, and vice versa. In this work, single-layer nanoporous graphene is used as RO membrane to investigate the effects of pore shape to reduce this contradiction by molecular dynamics simulations. Two kinds of pores (round and rectangular pores) with different sizes are simulated. Read More

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Pervaporation-assisted formation of nanoporous microchannels with various material and structural properties.

Lab Chip 2022 04 12;22(8):1474-1485. Epub 2022 Apr 12.

Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea.

Nanoporous structures are crucial for developing mixed-scale micro-/nanofluidic devices because they facilitate the manipulation of molecule transport along the microfluidic channel networks. Particularly, self-assembled particles have been used for fabricating various nanoporous membranes. However, previous self-assembly mechanisms relied on the material and structural homogeneities of the nanopores. Read More

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