74 results match your criteria finely layered

A Series of Molecule-Intercalated MoS as Anode Materials for Sodium Ion Batteries.

ACS Appl Mater Interfaces 2021 Mar 24;13(9):10870-10877. Epub 2021 Feb 24.

Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.

Molybdenum disulfide (MoS) with a graphite-like layer structure has attracted substantial interest as an anode material for sodium ion batteries (SIBs), but its inherent poor electrical conductivity and slow sodium ion transportation are the two important factors that limit its use in SIBs. Here, we report a general approach to synthesize a series of molecule-intercalated MoS with a precisely controlled interlayer distance of 0.62 to 1. Read More

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In vitro and in vivo evaluation of poly-3-hydroxybutyric acid-sodium alginate as a core-shell nanofibrous matrix with arginine and bacitracin-nanoclay complex for dermal reconstruction of excision wound.

Int J Biol Macromol 2021 Jan 7;168:46-58. Epub 2020 Dec 7.

Biological Materials Laboratory, CSIR-Central Leather Research Institute (CLRI), Adyar, Chennai, India. Electronic address:

The protective layer of the body, the skin is often prone to damage due to several factors like trauma, accidents, stress and hazardous exposure. This requires the skin to regenerate itself which is a finely regulated process. To hasten the process and prevent further damage, the dressing material is of prime importance. Read More

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January 2021

Finite-element numerical simulations of seismic attenuation in finely layered rocks.

J Acoust Soc Am 2020 10;148(4):1978

National Institute of Oceanography and Applied Geophysics - OGS, Trieste, Italy.

P-wave conversion to slow diffusion (Biot) modes at mesoscopic (small-scale) inhomogeneities in porous media is believed to be the most important attenuation mechanisms at seismic frequencies. This study considers three periodic thin layers saturated with gas, oil, and water, respectively, a realistic scenario in hydrocarbon reservoirs, and perform finite-element numerical simulations to obtain the wave velocities and quality factors along the direction perpendicular to layering. The results are validated by comparison to the Norris-Cavallini analytical solution, constituting a cross-check for both theory and numerical simulations. Read More

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October 2020

Ultrafine PdCu Nanoclusters by Ultrasonic-Assisted Reduction on the LDHs/rGO Hybrid with Significantly Enhanced Heck Reactivity.

ACS Appl Mater Interfaces 2020 Nov 27;12(45):50365-50376. Epub 2020 Oct 27.

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, China.

A series of hierarchical nanosheet array-like Co-Al layered double hydroxides (LDHs)/reduced graphene oxide (rGO) hybrid supported ultrafine PdCu nanocluster (NC) catalysts PdCu/LDHs/rGO (: Cu/Pd molar ratio of 1.5, 3.0, and 5. Read More

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November 2020

Ultrathin Transition Metal Chalcogenide Nanosheets Synthesized Topotactic Transformation for Effective Cancer Theranostics.

ACS Appl Mater Interfaces 2020 Oct 13;12(43):48310-48320. Epub 2020 Oct 13.

State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.

Ultrathin transition metal chalcogenide (TMC) nanosheets with ultrahigh photothermal conversion efficiency (η) and excellent stability are strongly desired in the application of photothermal therapy (PTT). However, the current synthetic methods of ultrathin TMC nanosheets have issues in obtaining uniform morphology, good dispersion, and satisfactory PTT behavior. Herein, ultrathin nanosheets of CoFe-selenide (CFS) with a finely controlled structure were prepared a topological structural transformation process from an ultrathin CoFe-layered double hydroxide (LDH) precursor, followed by surface modification with poly(ethylene glycol) (PEG). Read More

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October 2020

FLRTing Neurons in Cortical Migration During Cerebral Cortex Development.

Front Cell Dev Biol 2020 17;8:578506. Epub 2020 Sep 17.

Department of Biological Sciences, Faculty of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain.

During development, two coordinated events shape the morphology of the mammalian cerebral cortex, leading to the cortex's columnar and layered structure: the proliferation of neuronal progenitors and cortical migration. Pyramidal neurons originating from germinal zones migrate along radial glial fibers to their final position in the cortical plate by both radial migration and tangential dispersion. These processes rely on the delicate balance of intercellular adhesive and repulsive signaling that takes place between neurons interacting with different substrates and guidance cues. Read More

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September 2020

Effect of Intercalants inside Birnessite-Type Manganese Oxide Nanosheets for Sensor Applications.

Inorg Chem 2020 Nov 20;59(21):15595-15605. Epub 2020 Aug 20.

Centre of Excellence for Energy Storage Technology (CEST), Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand.

Hydrazine is a common reducing agent widely used in many industrial and chemical applications; however, its high toxicity causes severe human diseases even at low concentrations. To detect traces of hydrazine released into the environment, a robust sensor with high sensitivity and accuracy is required. An electrochemical sensor is favored for hydrazine detection owing to its ability to detect a small amount of hydrazine without derivatization. Read More

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November 2020

Rational Manipulation of Stacking Arrangements in Three-Dimensional Zeolites Built from Two-Dimensional Zeolitic Nanosheets.

Angew Chem Int Ed Engl 2020 Nov 31;59(45):19934-19939. Epub 2020 Aug 31.

Department of Chemical System Engineering, The University of Tokyo, Tokyo, 113-8656, Japan.

Unit-cell-thin zeolitic nanosheets have emerged as fascinating materials for catalysis and separation. The controllability of nanosheet stacking is extremely challenging in the chemistry of two-dimensional zeolitic materials. To date, the organization of zeolitic nanosheets in hydrothermal synthesis has been limited by the lack of tunable control over the guest-host interactions between organic structure-directing agents (OSDAs) and zeolitic nanosheets. Read More

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November 2020

Using applied pressure to guide materials design: a neutron diffraction study of LaNiO and PrNiO.

Dalton Trans 2020 Aug;49(30):10631-10637

ISIS Neutron and Muon Facility, STFC, Rutherford Appleton Laboratory, Chilton, OXON OX11 0QX, UK.

The compression behaviours of La2NiO4+δ and Pr2NiO4+δ have been studied up to a pressure of 2.8 and 2.2 GPa respectively. Read More

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Synthesis of Monolayer Blue Phosphorus Enabled by Silicon Intercalation.

ACS Nano 2020 Mar 9;14(3):3687-3695. Epub 2020 Mar 9.

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore.

The growth of entirely synthetic two-dimensional (2D) materials could further expand the library of naturally occurring layered solids and provide opportunities to design materials with finely tunable properties. Among them, the synthesis of elemental 2D materials is of particular interest as they represent the chemically simplest case and serve as a model system for exploring the on-surface synthesis mechanism. Here, a pure atomically thin blue phosphorus (BlueP) monolayer is synthesized silicon intercalation of the BlueP-Au alloy on Au(111). Read More

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Modulated transition metal-oxygen covalency in the octahedral sites of CoFe layered double hydroxides with vanadium doping leading to highly efficient electrocatalysts.

Nanoscale 2019 Dec 29;11(48):23296-23303. Epub 2019 Nov 29.

College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China.

The development of efficient and stable non-noble-metal electrocatalytic materials for the oxygen evolution reaction (OER) is a huge and important challenge at present. Herein, we report the prominent enhancement of OER activity via doping vanadium into CoFe-based layered double hydroxide (LDH) electrocatalysts. Electrochemical characterization shows that the CoFeV LDH grown on carbon papers (CPs) has an enormous electrochemical surface area (ECSA) and exhibits the smallest overpotential of 242 mV at 10 mA cm, which only requires a small Tafel slope of 41. Read More

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December 2019

Active catalyst construction for CO recycling via catalytic synthesis of N-doped carbon on supported Cu.

Nat Commun 2019 06 13;10(1):2599. Epub 2019 Jun 13.

State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, No.18, Tianshui Middle Road, 730000, Lanzhou, China.

Bridging homogeneous and heterogeneous catalysis is a long-term pursuit in the field of catalysis. Herein, we report our results in integration of nano- and molecular catalysis via catalytic synthesis of nitrogen doped carbon layers on AlOx supported nano-Cu which can finely tune the catalytic performance of the supported copper catalyst. This synthetic catalytic material, which can be generated in situ by the reaction of CuAlOx and 1,10-Phen in the presence of hydrogen, could be used for controllable synthesis of N,N-dimethylformamide (DMF) from dimethylamine and CO/H via blocking reaction pathways of further catalytic hydrogenation of DMF to N(CH). Read More

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Pressure-Induced Broadband Emission of 2D Organic-Inorganic Hybrid Perovskite (CHCHNH)PbBr.

Adv Sci (Weinh) 2019 Jan 24;6(2):1801628. Epub 2018 Nov 24.

State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China.

2D Ruddlesden-Popper halide perovskites, which incorporate hydrophobic organic interlayers to considerably improve environmental stability and optical properties diversity, have attracted substantial research attention for optoelectronic applications. The burgeoning broad emission arising from exciton self-trapping of 2D perovskites shows a strong dependence on a deformable structure. Here, the pressure-induced broadband emission of layered (001) Pb-Br perovskite with a large Stokes shift in the visible region is observed by finely improving lattice distortion to increase exciton-phonon coupling under hydrostatic pressure. Read More

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January 2019

New Insights into the Role of an Interlayer for the Fabrication of Highly Selective and Permeable Thin-Film Composite Nanofiltration Membrane.

ACS Appl Mater Interfaces 2019 Feb 5;11(7):7349-7356. Epub 2019 Feb 5.

State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering , Tianjin Polytechnic University , Tianjin 300387 , P. R. China.

A triple-layered TFC nanofiltration (NF) membrane consisting of a polyamide (PA) top layer covered on a poly(ether sulfone) microfiltration membrane with a carbon nanotube (CNT) interlayer was fabricated via interfacial polymerization. The structure and properties of the PA active layer could be finely tailored by tuning the interfacial properties and pore structure of the CNT interlayer, including its surface pore size and thickness, thus improving its NF performance. This TFC NF membrane exhibited a high divalent salt rejection (the rejection of NaSO and MgSO solution >98. Read More

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February 2019

Spatially-resolved H NMR relaxation-exchange measurements in heterogeneous media.

J Magn Reson 2019 Feb 14;299:101-108. Epub 2018 Dec 14.

Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK.

In the last decades, the H NMR T-T relaxation-exchange (REXSY) technique has become an essential tool for the molecular investigation of simple and complex fluids in heterogeneous porous solids and soft matter, where the mixing-time-evolution of cross-correlated T-T peaks enables a quantitative study of diffusive exchange kinetics in multi-component systems. Here, we present a spatially-resolved implementation of the T-T correlation technique, named z-T-T, based on one-dimensional spatial mapping along z using a rapid frequency-encode imaging scheme. Compared to other phase-encoding methods, the adopted MRI technique has two distinct advantages: (i) is has the same experimental duration of a standard (bulk) T-T measurement, and (ii) it provides a high spatial resolution. Read More

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February 2019

Wearable and Implantable Soft Bioelectronics Using Two-Dimensional Materials.

Acc Chem Res 2019 01 26;52(1):73-81. Epub 2018 Dec 26.

Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.

Soft bioelectronics intended for application to wearable and implantable biomedical devices have attracted great attention from material scientists, device engineers, and clinicians because of their extremely soft mechanical properties that match with a variety of human organs and tissues, including the brain, heart, skin, eye, muscles, and neurons, as well as their wide diversity in device designs and biomedical functions that can be finely tuned for each specific case of applications. These unique features of the soft bioelectronics have allowed minimal mechanical and biological damage to organs and tissues integrated with bioelectronic devices and reduced side effects including inflammation, skin irritation, and immune responses even after long-term biointegration. These favorable properties for biointegration have enabled long-term monitoring of key biomedical indicators with high signal-to-noise ratio, reliable diagnosis of the patient's health status, and in situ feedback therapy with high treatment efficacy optimized for the requirements of each specific disease model. Read More

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January 2019

Biophysical properties of single rotavirus particles account for the functions of protein shells in a multilayered virus.

Elife 2018 09 11;7. Epub 2018 Sep 11.

Centro Nacional de Microbiología/ISCIII, Majadahonda, Spain.

The functions performed by the concentric shells of multilayered dsRNA viruses require specific protein interactions that can be directly explored through their mechanical properties. We studied the stiffness, breaking force, critical strain and mechanical fatigue of individual Triple, Double and Single layered rotavirus (RV) particles. Our results, in combination with Finite Element simulations, demonstrate that the mechanics of the external layer provides the resistance needed to counteract the stringent conditions of extracellular media. Read More

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September 2018

Critical Role of the Chemical Environment of Interlayer Na Sites: An Effective Way To Improve the Na Ion Electrode Activity of Layered Titanate.

ACS Appl Mater Interfaces 2018 Oct 21;10(39):33112-33123. Epub 2018 Sep 21.

Center for Hybrid Interfacial Chemical Structure (CICS), Department of Chemistry and Nanoscience, College of Natural Sciences , Ewha Womans University , Seoul 03760 , Korea.

The chemical environments of the interlayer Na sites of layered titanate are finely controlled by the intercalation of n-alkylamine with various alkyl chain lengths to explore an effective way to improve its electrode functionality for sodium-ion batteries (SIBs). The n-alkylamine intercalation via ion-exchange and exfoliation-restacking routes allows the modification of in-plane structures of layered titanate to be tuned. Among the present n-alkylamine-intercalates, the n-pentylamine-intercalated titanate shows the largest discharge capacity with the best rate characteristics, underscoring the critical role of optimized intracrystalline structure in improving the SIB electrode performance of layered titanate. Read More

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October 2018

Co-delivery of Docetaxel and Disulfonate Tetraphenyl Chlorin in One Nanoparticle Produces Strong Synergism between Chemo- and Photodynamic Therapy in Drug-Sensitive and -Resistant Cancer Cells.

Mol Pharm 2018 10 7;15(10):4599-4611. Epub 2018 Sep 7.

Cell Biology Unit, Department of Biology , University of Padova , Padova , Italy.

Cancer therapies based on the combinations of different drugs and/or treatment modalities are emerging as important strategies for increasing efficacy and cure, decreasing unwanted toxicity, and overcoming drug resistance, provided that optimized drug concentration ratios are delivered into the target tissue. To these purposes, delivery systems such as nanoparticles (NPs) offer the unique opportunity to finely tune the drug loading and the release rate of drug combinations in the target tissues. Here, we propose double-layered polymeric NPs for the delivery of the chemotherapeutic docetaxel (DTX) and the photosensitizer disulfonate tetraphenyl chlorin (TPCS2a) coated with hyaluronic acid (HA), which allows cell targeting via CD44 receptors. Read More

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October 2018

Phase-Engineered Growth of Ultrathin InSe Flakes by Chemical Vapor Deposition for High-Efficiency Second Harmonic Generation.

Chemistry 2018 Oct 16;24(58):15678-15684. Epub 2018 Sep 16.

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of, Science and Technology (HUST), Wuhan, 430074, P. R. China.

As a novel layered indium selenide (InSe) semiconductor has been attracting considerable interest in the field of modern (opto)-electronics. Despite current progress, the synthesis of ultrathin InSe nanoflakes still poses quite a challenge, due to its universal co-existing varied stoichiometric compounds. In this work, a novel phase-engineered route is proposed for synthesizing ultrathin single-crystalline InSe nanoflakes with the assistance of a stable mass-transfer process in a space-confined chemical vapor deposition (CVD) system. Read More

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October 2018

Interface Properties of Nanosilica-Modified Waterborne Epoxy Cement Repairing System.

ACS Appl Mater Interfaces 2018 Jun 15;10(25):21696-21711. Epub 2018 Jun 15.

Nowadays, numerous concrete structures are urgently needed to be repaired and strengthened for the severe safety and durability of constructions. In this study, a novel type of silane-based interfacial coupling agent (ICA) is prepared by modifying the silane coupling agent (SCA) with a hydrothermally treated nanosilica (HTNS). The effect of ICA on the cement hydration and crystalline form as well as the hydrolysis/condensation extent of siloxanes is illustrated. Read More

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Enhancing Upconversion from NaYF₄:Yb,[email protected]₄ Core-Shell Nanoparticles Assembled on Metallic Nanostructures.

J Nanosci Nanotechnol 2018 Jul;18(7):5063-5073

Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, School of Physics and Materials Science, East China Normal University, Shanghai 200062, P. R. China.

We report a simple method for the fabrication of a three-layered plasmonic structure of silicon substrate-Au nanospheres-upconversion particles (UCNPs) that displays up to 101-fold fluorescence enhancement. Monodispersed pure hexagonal-phase NaYF4:Yb,Er core and NaYF4:Yb,[email protected] [email protected] nanocrystals were prepared by a solvothermal method. Two dimensional (2D) assembled Au spheres were prepared on a Si substrate, and then, 2D arrays of UCNPs were deposited on the grown 2D monolayered Au spheres by a self-organizing process. Read More

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Selection Role of Metal Oxides into Transition Metal Dichalcogenide Monolayers by a Direct Selenization Process.

ACS Appl Mater Interfaces 2018 Mar 6;10(11):9645-9652. Epub 2018 Mar 6.

Department of Material Science and Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan, ROC.

Direct reduction of metal oxides into a few transition metal dichalcogenide (TMDCs) monolayers has been recently explored as an alternative method for large area and uniform deposition. However, not many studies have addressed the characteristics and requirement of the metal oxides into TMDCs by the selenization/sulfurization processes, yielding a wide range of outstanding properties to poor electrical characteristics with nonuniform films. The large difference implies that the process is yet not fully understood. Read More

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Modulating the Electrochemical Performances of Layered Cathode Materials for Sodium Ion Batteries through Tuning Coulombic Repulsion between Negatively Charged TMO Slabs.

ACS Appl Mater Interfaces 2018 Jan 5;10(2):1707-1718. Epub 2018 Jan 5.

College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China.

Exploiting advanced layered transition metal oxide cathode materials is of great importance to rechargeable sodium batteries. Layered oxides are composed of negatively charged TMO slabs (TM = transition metal) separated by Na diffusion layers. Herein, we propose a novel insight, for the first time, to control the electrochemical properties by tuning Coulombic repulsion between negatively charged TMO slabs. Read More

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January 2018

Vibrational contributions to intrinsic friction in charged transition metal dichalcogenides.

Nanoscale 2017 Aug;9(32):11488-11497

Department of Control Engineering, Czech Technical University in Prague, Technicka 2, 16627 Prague 6, Czech Republic.

Vibrational contributions to intrinsic friction in layered transition metal dichalcogenides (TMDs) have been studied at different charge contents. We find that any deviation from charge neutrality produces complex rearrangements of atomic positions and electronic distributions, and consequent phase transitions. Upon charge injection, cell volume expansion is observed, due to charge accumulation along an axis orthogonal to the layer planes. Read More

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Nanostructured Three-Dimensional (3D) Assembly of 2D MoS and Graphene Directly Build From Acidic Graphite Oxide.

Chem Asian J 2017 Oct 5;12(19):2528-2532. Epub 2017 Sep 5.

Department of Chemical Engineering, The Petroleum Institute, P.O box 2533, Abu Dhabi, UAE.

A 3D highly interconnected macroporous network of reduced GO having finely dispersed few-layered 2D MoS nanosheets was constructed through direct use of acidic graphite oxide (GO) for the first time. This facile and technologically scalable process can afford efficient hydrodesulfurization electrocatalysts as potential anode materials at lower cost, and can circumvent the poor thermal stability and recyclability of the material. The strategy provided here can be the basis to design and develop practical processes to address the ultimate goal of large-scale manufacturing of hybrids composed of 2D materials for various energy and catalysis applications. Read More

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October 2017

Cation-Eutectic Transition via Sublattice Melting in CuInPS/InPS van der Waals Layered Crystals.

ACS Nano 2017 07 14;11(7):7060-7073. Epub 2017 Jul 14.

School of Chemical & Biomolecular Engineering, Georgia Institute of Engineering , 311 Ferst Drive NW, Atlanta, Georgia 30332, United States.

Single crystals of the van der Waals layered ferrielectric material CuInPS spontaneously phase separate when synthesized with Cu deficiency. Here we identify a route to form and tune intralayer heterostructures between the corresponding ferrielectric (CuInPS) and paraelectric (InPS) phases through control of chemical phase separation. We conclusively demonstrate that Cu-deficient CuInPS forms a single phase at high temperature. Read More

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Enhanced base-catalyzed activity and structural stability of nitrogen-doped carbon modified MgO-MgFeO magnetic composites as catalysts for transesterification of tributyrin.

Dalton Trans 2017 May;46(19):6324-6332

State Key Laboratory of Chemical Resources Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

In this work, nitrogen-doped carbon modified MgO-MgFeO (CN-MgFeO) magnetic composites were synthesized by a facile thermal decomposition of Mg-Fe layered double hydroxide (MgFe-LDH) and cyanamide mixture precursors. A series of comprehensive characterization studies including powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared of CO adsorption, CO-temperature programmed desorption, and X-ray photoelectron spectroscopy indicated that the introduction of cyanamide could finely tune the surface basicity of the resulting CN-MgFeO composites, especially surface strong Lewis basicity. Compared with CN-free MgFeO, the as-fabricated CN-MgFeO catalysts showed higher activity in the liquid-phase transesterification of tributyrin with methanol. Read More

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Quantitative analysis of total reflection X-ray fluorescence from finely layered structures using XeRay.

Rev Sci Instrum 2017 Mar;88(3):033112

James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.

Total reflection x-ray fluorescence (TXRF) is a widely applicable experimental technique for studying chemical element distributions across finely layered structures at extremely high sensitivity. To promote and facilitate scientific discovery using TXRF, we developed a MATLAB-based software package with a graphical user interface, named XeRay, for quick, accurate, and intuitive data analysis. XeRay lets the user model any layered system, each layer with its independent chemical composition and thickness, and enables fine-tuned data fitting. Read More

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Numerical investigation of depth profiling capabilities of helium and neon ions in ion microscopy.

Beilstein J Nanotechnol 2016 17;7:1749-1760. Epub 2016 Nov 17.

Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, L-4422 Belvaux, Luxembourg.

The analysis of polymers by secondary ion mass spectrometry (SIMS) has been a topic of interest for many years. In recent years, the primary ion species evolved from heavy monatomic ions to cluster and massive cluster primary ions in order to preserve a maximum of organic information. The progress in less-damaging sputtering goes along with a loss in lateral resolution for 2D and 3D imaging. Read More

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November 2016