5,222 results match your criteria layered structures

Mn as the "spearhead" preventing the trap of Zn in layered Mn inserted hydrated vanadium pentoxide enables high rate capacity.

J Colloid Interface Sci 2021 May 30;602:14-22. Epub 2021 May 30.

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China. Electronic address:

Vanadium oxides attract much attention and are concerned as one of the most promising cathodes for aqueous zinc-ion batteries (AZIBs) owing to the layered structures. However, their intensive development is limited by the fragile structures and laggard ion-transferring. Herein, Mn inserted hydrated vanadium pentoxide nanobelts/reduced graphene oxide (MnVO·nHO/rGO, abbreviated as MnVOH/rGO) was prepared by a simple one-pot hydrothermal process, delivering excellent electrochemical properties for AZIBs. Read More

View Article and Full-Text PDF

Widespread Negative Longitudinal Piezoelectric Responses in Ferroelectric Crystals with Layered Structures.

Phys Rev Lett 2021 May;126(21):217601

Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.

In this study, we investigate the underlying mechanisms of the universal negative piezoelectricity in low-dimensional layered materials by carrying out first-principles calculations. Two-dimensional layered ferroelectric CuInP_{2}S_{6} is analyzed in detail as a typical example, but the theory can be applied to any other low-dimensional layered piezoelectrics. Consistent with the theory proposed in [Phys. Read More

View Article and Full-Text PDF

Simulations of Trions and Biexcitons in Layered Hybrid Organic-Inorganic Lead Halide Perovskites.

Phys Rev Lett 2021 May;126(21):216402

Department of Chemistry, Columbia University, New York, New York 10027, USA.

Behaving like atomically precise two-dimensional quantum wells with non-negligible dielectric contrast, the layered hybrid organic-inorganic lead halide perovskites (HOIPs) have strong electronic interactions leading to tightly bound excitons with binding energies on the order of 500 meV. These strong interactions suggest the possibility of larger excitonic complexes like trions and biexcitons, which are hard to study numerically due to the complexity of the layered HOIPs. Here, we propose and parametrize a model Hamiltonian for excitonic complexes in layered HOIPs and we study the correlated eigenfunctions of trions and biexcitons using a combination of diffusion Monte Carlo and very large variational calculations with explicitly correlated Gaussian basis functions. Read More

View Article and Full-Text PDF

Bending Response of a Book with Internal Friction.

Phys Rev Lett 2021 May;126(21):218004

Flexible Structures Laboratory, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.

We study the bending of a booklike system, comprising a stack of elastic plates coupled through friction. The behavior of this layered system is rich and nontrivial, with a nonadditive enhancement of the apparent stiffness and a significant hysteretic response. A dimension reduction procedure is employed to develop a centerline-based theory describing the stack as a nonlinear planar rod with internal shear. Read More

View Article and Full-Text PDF

Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal.

Nat Commun 2021 Jun 10;12(1):3645. Epub 2021 Jun 10.

Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui, China.

Understanding the competition between superconductivity and other ordered states (such as antiferromagnetic or charge-density-wave (CDW) state) is a central issue in condensed matter physics. The recently discovered layered kagome metal AVSb (A = K, Rb, and Cs) provides us a new playground to study the interplay of superconductivity and CDW state by involving nontrivial topology of band structures. Here, we conduct high-pressure electrical transport and magnetic susceptibility measurements to study CsVSb with the highest T of 2. Read More

View Article and Full-Text PDF

Multielement 2D layered material photodetectors.

Nanotechnology 2021 Jun 10. Epub 2021 Jun 10.

The State Key Lab of Opotoelectronic Materials and Technology, Sun Yat-Sen University, Guangzhou 510275, Guangzhou, 510275, CHINA.

The pronounced quantum confinement effects, outstanding mechanical strength, strong light-matter interactions and reasonably high electric transport properties under atomically thin limit have conjointly established 2D layered materials (2DLMs) as compelling building blocks towards the next generation optoelectronic devices. By virtue of the diverse compositions and crystal structures which bring about abundant physical properties, multielement 2DLMs (ME2DLMs) have become a bran-new research focus of tremendous scientific enthusiasm. Herein, for the first time, this review provides a comprehensive overview on the latest evolution of ME2DLM photodetectors. Read More

View Article and Full-Text PDF

Liquid Crystal-Mediated 3D Printing Process to Fabricate Nano-Ordered Layered Structures.

ACS Appl Mater Interfaces 2021 Jun 10. Epub 2021 Jun 10.

School of Chemical Engineering, University of New South Wales (UNSW), Sydney 2052, New South Wales, Australia.

The emergence of three-dimensional (3D) printing promises a disruption in the design and on-demand fabrication of smart structures in applications ranging from functional devices to human organs. However, the scale at which 3D printing excels is within macro- and microlevels and principally lacks the spatial ordering of building blocks at nanolevels, which is vital for most multifunctional devices. Herein, we employ liquid crystal (LC) inks to bridge the gap between the nano- and microscales in a single-step 3D printing. Read More

View Article and Full-Text PDF

Emerging 2D Memory Devices for In-Memory Computing.

Adv Mater 2021 Jun 8:e2007081. Epub 2021 Jun 8.

Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.

It is predicted that the conventional von Neumann computing architecture cannot meet the demands of future data-intensive computing applications due to the bottleneck between the processing and memory units. To try to solve this problem, in-memory computing technology, where calculations are carried out in situ within each nonvolatile memory unit, has been intensively studied. Among various candidate materials, 2D layered materials have recently demonstrated many new features that have been uniquely exploited to build next-generation electronics. Read More

View Article and Full-Text PDF

High Pressure Hydrogen and the Potts Model on a Triangular Lattice.

J Phys Condens Matter 2021 Jun 8. Epub 2021 Jun 8.

School of Physics & Astronomy, The University of Edinburgh, 2502 JCMB Kings Buildings, Edinburgh, EH9 3FD, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

We present Monte Carlo studies and analysis of the frustrated antiferromagnetic Potts model of a triangular lattice. This Potts model shows a remarkably rich range of structures, and striking similarities to the high pressure phases of hydrogen which are typified by hexagonal close packed layered structures. There are four known H2 molecular phases, all of which are isostructural to within the resolution of X-ray diffraction. Read More

View Article and Full-Text PDF

Recent advancements in the bioprinting of vascular grafts.

Biofabrication 2021 Jun 8. Epub 2021 Jun 8.

IMP, The University of Edinburgh, Sanderson Building, Edinburgh, EH8 9YL, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

Occlusive artery disease and cardiovascular disease are the major causes of death globally. These diseases are caused by the blockage in the arteries, which results in a decreased blood flow to the tissues of major organs in the body, such as the heart. Bypass surgery is often performed using a vascular graft to re-route the blood flow. Read More

View Article and Full-Text PDF

The classification of 1D `perovskites'.

Acta Crystallogr B Struct Sci Cryst Eng Mater 2021 Jun 20;77(Pt 3):408-415. Epub 2021 May 20.

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

There has been a huge amount of interest in perovskites recently and new structures of hybrid perovskites are frequently reported. The classification of perovskites has been unambiguous in the discussion of 3D and layered 2D perovskites due to the dimensional constraints. However, in 1D perovskites, the additional degrees of freedom have resulted in a large number of possible structural configurations. Read More

View Article and Full-Text PDF

Facile optimization of hierarchical topography and chemistry on magnetically active graphene oxide nanosheets.

Chem Sci 2020 Mar 20;11(25):6556-6566. Epub 2020 Mar 20.

Bio-Inspired Polymeric Materials Lab, Department of Chemistry, Indian Institute of Technology-Guwahati Kamrup Assam 781039 India

Highly flexible and two-dimensional (2D) graphene oxide (GO) nanosheets have remained instrumental for developing different functional materials for practically relevant applications. In general, 2D GO is routinely assembled into different structures ( layered, porous, ) for achieving desired properties. However, a facile approach for modifying GO nanosheets with (1) hierarchical topography and (2) desired chemistry is rare in the literature. Read More

View Article and Full-Text PDF

Contributions of secondary alcohol-ketone O-H...O=C and furan-acetate Csp-H...OOC synthons to the supramolecular packings of two bioactive molecules.

Acta Crystallogr C Struct Chem 2021 06 27;77(Pt 6):312-320. Epub 2021 May 27.

Chemistry Department, Faculty of Science, University of Dschang, PO Box 67, Dschang, Cameroon.

The crystal structures of rubescin D (1, CHO) and monadelphin A (2, CHO), bioactive molecules of the vilasinin and gedunin classes of limonoids, respectively, are reported for the first time and the synthons affecting their crystal packings are analyzed on the basis of their occurrences in molecules in the Cambridge Structural Database that share the same moieties. Rubescin D, 1, crystallizes in the space group P2 and its molecular structure consists of three six-membered rings A, C and D having, respectively, envelope, twist-boat and half-chair conformations, and three five-membered rings with half-chair (B and E) and planar conformations (F). Many synthons found in the crystal packing of 1 are in agreement with expectations derived from molecules displaying the same moieties. Read More

View Article and Full-Text PDF

Structural and Chemical Variations in the Skeletal Segments of Coralline Red Algae Lead to Improved Crack Resistance.

Acta Biomater 2021 Jun 1. Epub 2021 Jun 1.

Department of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, 32000 Haifa, Israel.

Jania sp. is an articulated coralline red alga that is abundant in the shallow waters of oceans worldwide. We have previously demonstrated that its structure is highly intricate and exhibits hierarchical organization across multiple length scales from the macro to the nano scale. Read More

View Article and Full-Text PDF

Layered Hybrid Formamidinium Lead Iodide Perovskites: Challenges and Opportunities.

Acc Chem Res 2021 Jun 4. Epub 2021 Jun 4.

Laboratory of Photonics and Interfaces, EPFL, Station 6, 1015 Lausanne, Switzerland.

ConspectusHybrid halide perovskite materials have become one of the leading candidates for various optoelectronic applications. They are based on organic-inorganic structures defined by the AMX composition, were A is the central cation that can be either organic (e.g. Read More

View Article and Full-Text PDF

Conservation of neural progenitor identity and the emergence of neocortical neuronal diversity.

Semin Cell Dev Biol 2021 May 31. Epub 2021 May 31.

The University of Queensland, Queensland Brain Institute, Brisbane, Queensland 4072, Australia. Electronic address:

One paramount challenge for neuroscientists over the past century has been to identify the embryonic origins of the enormous diversity of cortical neurons found in the adult human neocortex and to unravel the developmental processes governing their emergence. In all mammals, including humans, the radial glia lining the ventricles of the embryonic telencephalon, more recently reclassified as apical radial glia (aRGs), have been identified as the neural progenitors giving rise to all excitatory neurons and inhibitory interneurons of the six-layered cortex. In this review, we explore the fundamental molecular and cellular mechanisms that regulate aRG function and the generation of neuronal diversity in the dorsal telencephalon. Read More

View Article and Full-Text PDF

2D Lead Iodide Perovskite with Mercaptan-Containing Amine and Its Exceptional Water Stability.

Inorg Chem 2021 Jun 3. Epub 2021 Jun 3.

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.

Two dimensional (2D) hybrid perovskites have attracted a great deal of interest because of their appropriate photovoltaic efficiency and environmental stability. Although some 2D hybrid perovskites with sulfur-containing amines have been reported, the cation having the mercaptan group has not been well explored yet. In this work, cysteamine (Cya, HS(CH)NH), a mercaptan-containing amine, was introduced into 2D hybrid perovskite. Read More

View Article and Full-Text PDF

Flexible and porous 2D layered structures based on mixed-linker metal-organic frameworks for gas sorption studies.

Dalton Trans 2021 Jun 2. Epub 2021 Jun 2.

Département de Chimie, Biochimie et physique and Institut de Recherche sur l'Hydrogène, Université du Québec à Trois-Rivières, Trois-Rivières, Québec G9A 5H7, Canada.

Layered structures of flexible mixed-linker metal-organic frameworks termed IRHs-(4 and 5) (IRH = Institut de Recherche sur l'Hydrogène) were synthesized by mixing cyclam, tetrakis(4-carboxyphenyl)benzene (TCPB), and copper and zinc metal salts respectively. The new materials characterized by single-crystal X-ray diffraction exhibited the features of HOFs and MOFs. Their structures are formed by coordination and hydrogen bonds that link metallocyclam (with Cu or Zn) and TCPB to a 2D sheet which is further packed to form a 3D structure with 1D microchannels. Read More

View Article and Full-Text PDF

Size-dependent phase stability in transition metal dichalcogenide nanoparticles controlled by metal substrates.

Nanoscale 2021 Jun 1;13(22):10167-10180. Epub 2021 Jun 1.

Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.

Nanomaterials based on MoS and related transition metal dichalcogenides (TMDCs) are remarkably versatile; MoS nanoparticles are proven catalysts for processes such as hydrodesulphurization and the hydrogen evolution reaction, and transition metal dichalcogenides in general have recently emerged as novel 2D components for nanoscale electronics and optoelectronics. The properties of such materials are intimately related to their structure and dimensionality. For example, only the edges exposed by MoS nanoparticles (NPs) are catalytically active, and extended MoS systems show different character (direct or indirect gap semiconducting, or metallic) depending on their thickness and crystallographic phase. Read More

View Article and Full-Text PDF

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation.

Sci Rep 2021 Jun 1;11(1):11531. Epub 2021 Jun 1.

College of Information Science and Electronic Engineering Zhejiang University, Hangzhou, 310058, People's Republic of China.

With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. In this letter, we report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. Compared with the previous ones that have inhomogeneous parameter distributions, the designed devices are composed of several parts with homogeneous parameters, which can be achieved with the help of few homogeneous layered structures. Read More

View Article and Full-Text PDF

Modelling of Anisotropic Electrical Conduction in Layered Structures 3D-Printed with Fused Deposition Modelling.

Sensors (Basel) 2021 May 26;21(11). Epub 2021 May 26.

Robotics and Mechatronics Group (RAM), University of Twente, 7500 AE Enschede, The Netherlands.

3D-printing conductive structures have recently been receiving increased attention, especially in the field of 3D-printed sensors. However, the printing processes introduce anisotropic electrical properties due to the infill and bonding conditions. Insights into the electrical conduction that results from the anisotropic electrical properties are currently limited. Read More

View Article and Full-Text PDF

Insights into Layered Oxide Cathodes for Rechargeable Batteries.

Molecules 2021 May 26;26(11). Epub 2021 May 26.

Department of Materials Science and Engineering, UC Berkeley, Berkeley, CA 94720, USA.

Layered intercalation compounds are the dominant cathode materials for rechargeable Li-ion batteries. In this article we summarize in a pedagogical way our work in understanding how the structure's topology, electronic structure, and chemistry interact to determine its electrochemical performance. We discuss how alkali-alkali interactions within the Li layer influence the voltage profile, the role of the transition metal electronic structure in dictating O3-structural stability, and the mechanism for alkali diffusion. Read More

View Article and Full-Text PDF

Photoactive Thin-Film Structures of Curcumin, TiO and ZnO.

Molecules 2021 May 27;26(11). Epub 2021 May 27.

Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland.

Curcumin is known as a biologically active compound and a possible antimicrobial agent. Here, we combine it with TiO and ZnO semiconductors, known for their photocatalytic properties, with an eye towards synergistic photo-harvesting and/or antimicrobial effects. We deposit different nanoscale multi-layer structures of curcumin, TiO and ZnO, by combining the solution-based spin-coating (S-C) technique and the gas-phase atomic layer deposition (ALD) and molecular layer deposition (MLD) thin-film techniques. Read More

View Article and Full-Text PDF

Identification of Mode Shapes of a Composite Cylinder Using Convolutional Neural Networks.

Materials (Basel) 2021 May 25;14(11). Epub 2021 May 25.

Faculty of Civil and Environmental Engineering and Architecture, Rzeszów University of Technology, al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland.

The aim of the following paper is to discuss a newly developed approach for the identification of vibration mode shapes of multilayer composite structures. To overcome the limitations of the approaches based on image analysis (two-dimensional structures, high spatial resolution of mode shapes description), convolutional neural networks (CNNs) are applied to create a three-dimensional mode shapes identification algorithm with a significantly reduced number of mode shape vector coordinates. The CNN-based procedure is accurate, effective, and robust to noisy input data. Read More

View Article and Full-Text PDF

Transition Metal-Based 2D Layered Double Hydroxide Nanosheets: Design Strategies and Applications in Oxygen Evolution Reaction.

Nanomaterials (Basel) 2021 May 25;11(6). Epub 2021 May 25.

Department of Chemistry, Chungnam National University, Daejeon 34134, Korea.

Water splitting driven by renewable energy sources is considered a sustainable way of hydrogen production, an ideal fuel to overcome the energy issue and its environmental challenges. The rational design of electrocatalysts serves as a critical point to achieve efficient water splitting. Layered double hydroxides (LDHs) with two-dimensionally (2D) layered structures hold great potential in electrocatalysis owing to their ease of preparation, structural flexibility, and tenability. Read More

View Article and Full-Text PDF

Sub-Tissue Localization of Phytochemicals in (L.) J. Presl. Growing in Northern Italy.

Plants (Basel) 2021 May 19;10(5). Epub 2021 May 19.

Department of Chemistry, University of Milano, Via Golgi 19, 20133 Milano, Italy.

In the present paper, we focused our attention on (L.) J. Presl. Read More

View Article and Full-Text PDF

Effect of Residual Trace Amounts of Fe and Al in Li[NiMnCo]O Cathode Active Material for the Sustainable Recycling of Lithium-Ion Batteries.

Materials (Basel) 2021 May 10;14(9). Epub 2021 May 10.

Department of Energy & Mineral Resources Engineering, Sejong University, Seoul 05006, Korea.

As the explosive growth of the electric vehicle market leads to an increase in spent lithium-ion batteries (LIBs), the disposal of LIBs has also made headlines. In this study, we synthesized the cathode active materials Li[NiMnCo]O (NMC) and Li[NiMnCoFeAl]O (NMCFA) via hydroxide co-precipitation and calcination processes, which simulate the resynthesis of NMC in leachate containing trace amounts of iron and aluminum from spent LIBs. The effects of iron and aluminum on the physicochemical and electrochemical properties were investigated and compared with NMC. Read More

View Article and Full-Text PDF

Two-Dimensional Nanostructures for Electrochemical Biosensor.

Sensors (Basel) 2021 May 12;21(10). Epub 2021 May 12.

Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY 13699, USA.

Current advancements in the development of functional nanomaterials and precisely designed nanostructures have created new opportunities for the fabrication of practical biosensors for field analysis. Two-dimensional (2D) and three-dimensional (3D) nanomaterials provide unique hierarchical structures, high surface area, and layered configurations with multiple length scales and porosity, and the possibility to create functionalities for targeted recognition at their surface. Such hierarchical structures offer prospects to tune the characteristics of materials-e. Read More

View Article and Full-Text PDF

Special Issue: Layered Double Hydroxides (LDH) and LDH-Based Hybrid Composites.

Jakub Matusik

Materials (Basel) 2021 May 16;14(10). Epub 2021 May 16.

Department of Mineralogy, Petrography and Geochemistry, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland.

LDHs are a class of two-dimensional layered anionic structures with unique properties [... Read More

View Article and Full-Text PDF

Understanding the Steric Structures of Dicarboxylate Ions Incorporated in Octacalcium Phosphate Crystals.

Materials (Basel) 2021 May 21;14(11). Epub 2021 May 21.

Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

Octacalcium phosphate (OCP) can incorporate various dicarboxylate ions in the interlayer spaces of its layered structure. Although not proven, these incorporated ions are believed to have a linear structure. In this study, the steric structures of twelve different dicarboxylate ions incorporated into OCP were investigated by comparing the experimentally determined interlayer distance of the OCP with the distance estimated using the molecular sizes of dicarboxylic acids calculated by considering their steric structures. Read More

View Article and Full-Text PDF