306,249 results match your criteria materials high


Patients with Severe Lactic Acidosis in the Intensive Care Unit: A Retrospective Study of Contributing Factors and Impact of Renal Replacement Therapy.

Blood Purif 2021 Sep 15:1-7. Epub 2021 Sep 15.

Department of Nephrology, Ghent University Hospital, Ghent, Belgium.

Introduction: Hyperlactatemia is a regular condition in the intensive care unit, which is often associated with adverse outcomes. Control of the triggering condition is the most effective treatment of hyperlactatemia, but since this is mostly not readily possible, extracorporeal renal replacement therapy (RRT) is often tried as a last resort. The present study aims to evaluate the factors that may contribute to the decision whether to start RRT or not and the potential impact of the start of RRT on the outcome in patients with severe lactic acidosis (SLA) (lactate ≥5 mmol/L). Read More

View Article and Full-Text PDF
September 2021

Primary Localized Cutaneous Amyloidosis: A Retrospective Study of an Uncommon Skin Disease in the Largest Tertiary Care Center in Switzerland.

Dermatology 2021 Sep 15:1-8. Epub 2021 Sep 15.

Department of Dermatology, University Hospital Zurich, Zurich, Switzerland.

Background: Primary localized cutaneous amyloidosis (PLCA) is defined by the deposition of amyloid protein in the skin without systemic involvement. There are four subtypes of PLCA: lichen amyloidosis (LA), macular amyloidosis (MA), biphasic amyloidosis (BA), and nodular amyloidosis (NA). PLCA occurs most frequently in Latin Americans and Asians. Read More

View Article and Full-Text PDF
September 2021

Nanoscale mapping of electric polarizability in a heterogeneous dielectric material with surface irregularities.

Nanotechnology 2021 Sep 15. Epub 2021 Sep 15.

Electrical Engineering, Tsinghua University, State Key Laboratory of Power System, Department of, Electrical Engineering, Beijing, 100084, CHINA.

Nanoscale mapping of electric polarizability in a heterogeneous dielectric material with surface irregularities is of scientific and technical significance, but remains challenging. Here, we present an approach based on intermodulation electrostatic force microscopy (EFM) in conjunction with finite element computation for precise and high-resolution mapping of polarizability in dielectric materials. Instead of using electrostatic force in conventional quantitative EFM approaches, the force gradient is acquired to achieve an unprecedented spatial resolution. Read More

View Article and Full-Text PDF
September 2021

Magneto- and opto-stimuli responsive nanofibers as a controlled drug delivery system.

Nanotechnology 2021 Sep 15. Epub 2021 Sep 15.

Department of Bioengineering, University of California Riverside, 900 University Avenue, 331 Materials Science and Engineering Building, Riverside, California, 92521, UNITED STATES.

The drawbacks of conventional drug administration include repeated administration, non-specific biodistribution in the body's systems, the long-term unsustainability of drug molecules, and high global cytotoxicity, posing a challenge for the efficient treatment of chronic diseases that require varying drug dosages over time for optimal therapeutic efficacy. Most controlled release methods encapsulate drug molecules in biodegradable materials that dissolve over time to release the drug, making it difficult to deliver drugs on a schedule. To address these limitations, we developed a magneto-, opto-stimuli responsive drug delivery system based on functionalized electrospun nanofibers loaded with superparamagnetic iron oxide nanoparticles (SPIONs). Read More

View Article and Full-Text PDF
September 2021

WSe2 crystals on paper: flexible, large area and broadband photodetectors.

Nanotechnology 2021 Sep 15. Epub 2021 Sep 15.

Department of Physics, Charotar University of Science and Technology, Changa, Anand, 388 421, changa, 388421, INDIA.

The paper-based photodetector has recently captivated a great deal of attention in various opto-electronics applications because of facile, cost effective and green synthesis. Two-dimensional TMDC (transition metal dichalcogenide) materials are promising for photodetection under the broad spectral range. In this work, we have fabricated paper-based device by rubbing the tungsten di-selenide (WSe2) crystals on paper substrate. Read More

View Article and Full-Text PDF
September 2021

Detection and electrocatalytic mechanism of zearalenone using nanohybrid sensor based on copper-based metal-organic framework/magnetic FeO-graphene oxide modified electrode.

Food Chem 2021 Sep 2;370:131024. Epub 2021 Sep 2.

Institute of Functional Materials and Agricultural Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China.

A novel and simple strategy was proposed for the determination of ZEA in breakfast cereal, maize powder and rice flour using an electrochemical nanohybrid sensor based on copper-based metal-organic framework (Cu-MOF)/magnetic FeO-graphene oxide (FeO-GO) modified electrode fabricated by the layer-by-layer assembled technique. The synthesized Cu-MOF with high porosity favorably improved the effective surface area and the analytical performance of nanohybrid sensing electrode. The crafted sensor has large surface area, high electron transfer, and satisfactory efficiency. Read More

View Article and Full-Text PDF
September 2021

Local structuring of diketopyrrolopyrrole (DPP)-based oligomers from molecular dynamics simulations.

Phys Chem Chem Phys 2021 Sep 15;23(35):19693-19707. Epub 2021 Sep 15.

Department of Chemistry, University of Liverpool, Crown Place, Liverpool, L69 7ZD, UK.

The microscopic structure of high mobility semiconducting polymers is known to be essential for their performance but it cannot be easily deduced from the available experimental data. A series of short oligomers of diketopyrrolopyrrole (DPP)-based materials that display high charge mobility are studied by molecular dynamics simulations to understand their local structuring at an atomic level. Different analyses are proposed to compare the ability of different oligomers to form large aggregates and their driving force. Read More

View Article and Full-Text PDF
September 2021

Intrinsic defect structures of polycrystalline CaKFeAs superconductors.

Phys Chem Chem Phys 2021 Sep 15;23(35):19827-19833. Epub 2021 Sep 15.

Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan.

We investigated the defect structures of polycrystalline CaKFeAs (CaK1144) superconductors by scanning transmission electron microscopy (STEM). The STEM studies revealed the presence of a one-layer CaFeAs (∼1 nm size) defect along the -plane, as observed in single crystalline CaK1144. Step-like CaFeAs defects are also observed. Read More

View Article and Full-Text PDF
September 2021

Lithium and sodium intercalation in a 2D NbSe bilayer-stacked homostructure: comparative study of ionic adsorption and diffusion behavior.

Phys Chem Chem Phys 2021 Sep 15;23(35):19811-19818. Epub 2021 Sep 15.

Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan.

In this work, we probed the lithium and sodium intercalation properties in monolayer-stacked NbSe bilayer homostructure configurations for their potential application as anode materials in lithium and sodium ion batteries. Similar to known monolayer transition metal dichalcogenides, such as VS, the structural phase transition barrier of NbSe from 1H to 1T is strengthened by lithium and sodium adsorption, implying that it is robust under multiple charging and discharging processes. As multi-layer, stacked 2D materials are more relevant to experiments and their intended applications, four bilayer homostructure stackings were constructed based on the alignment of Nb and Se. Read More

View Article and Full-Text PDF
September 2021

Ultra-low thermal conductivity and high thermoelectric performance of monolayer BiP: a first principles study.

Phys Chem Chem Phys 2021 Sep 15;23(35):19834-19840. Epub 2021 Sep 15.

School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.

The thermoelectric properties of monolayer triphosphide BiP are studied first principles calculations and Boltzmann transport equation. First, the Seebeck coefficient, electrical conductivity and electron thermal conductivity at different temperatures are calculated using the Boltzmann transport equation with relaxation time approximation. It has been observed that BiP has a large power factor (265 × 10 W K m, 700 K). Read More

View Article and Full-Text PDF
September 2021

Stromal marker fibroblast activation protein drives outcome in T1 non-muscle invasive bladder cancer.

PLoS One 2021 15;16(9):e0257195. Epub 2021 Sep 15.

Department of Urology, University Hospitals Leuven, Leuven, Belgium.

Fibroblast activation protein-α (FAP) is a transmembrane peptidase and a surrogate marker for cancer-associated fibroblasts (CAFs). FAP has been linked to worse prognosis and therapy resistance in several cancers. We hypothesised that FAP might have a prognostic 3biomarker potential to stratify patients with high-grade (HG) T1 non-muscle-invasive bladder cancer (NMIBC). Read More

View Article and Full-Text PDF
September 2021

Impact of Lipid Peroxidation on the Response of Cell Membranes to High-Speed Equibiaxial Stretching: A Computational Study.

J Phys Chem B 2021 Sep 15. Epub 2021 Sep 15.

Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China.

The difference between diseased and healthy cellular membranes in response to mechanical stresses is crucial for biology, as well as in the development of medical devices. However, the biomolecular mechanisms by which mechanical stresses interact with diseased cellular components remain largely unknown. In this work, we focus on the response of diseased cellular membranes with lipid peroxidation to high-speed tensile loadings. Read More

View Article and Full-Text PDF
September 2021

Mixed Cationic and Anionic Redox in Ni and Co Free Chalcogen-Based Cathode Chemistry for Li-Ion Batteries.

J Am Chem Soc 2021 Sep 15. Epub 2021 Sep 15.

Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, United States.

Mixed cationic and anionic redox cathode chemistry is emerging as the conventional cationic redox centers of transition-metal-based layered oxides are reaching their theoretical capacity limit. However, these anionic redox reactions in transition metal oxide-based cathodes attained by taking excess lithium ions have resulted in stability issues due to weak metal-oxygen ligand covalency. Here, we present an alternative approach of improving metal-ligand covalency by introducing a less electronegative chalcogen ligand (sulfur) in the cathode structural framework where the metal d band penetrates into the ligand p band, thereby utilizing reversible mixed anionic and cationic redox chemistry. Read More

View Article and Full-Text PDF
September 2021

A Mild CO Etching Method To Tailor the Pore Structure of Platinum-Free Oxygen Reduction Catalysts in Proton Exchange Membrane Fuel Cells.

ACS Appl Mater Interfaces 2021 Sep 15. Epub 2021 Sep 15.

State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative innovation center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

The structural tailoring of pores is essential to high-performance Fe/N/C electrocatalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. Current strategies for pore structure engineering are usually accompanied with a drastic change of the intrinsic activity-related surface, which may mask the real effects of the porous structure on ORR activity. Herein, a mild carbon dioxide (CO) etching method was used to flexibly tailor the pore structure of Fe/N/C electrocatalysts without drastic changes in their surface structure and property. Read More

View Article and Full-Text PDF
September 2021

Two-Dimensional Polymers: Synthesis and Applications.

Authors:
Zili Li Zhiqun Lin

ACS Appl Mater Interfaces 2021 Sep 15. Epub 2021 Sep 15.

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Two-dimensional (2D) polymers represent an emerging class of nanomaterials possessing covalent sheet-like morphology. They display a set of intriguing properties, including large specific surface area, low density, versatile control over sizes and compositions, and high adaptability. As such, they find application in energy conversion and storage, nanotechnology, and biotechnology. Read More

View Article and Full-Text PDF
September 2021

Bioavailability of Aflatoxins in Cultured Fish and Animal Livers Using an Dialyzability Approach.

J Agric Food Chem 2021 Sep 15. Epub 2021 Sep 15.

Trace Element, Spectroscopy and Speciation Group (GETEE), Strategic Grouping in Materials (AEMAT), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Universidade de Santiago de Compostela, Avenida das Ciencias, s/n, 15782 Santiago de Compostela, Spain.

The objective of the present study was to investigate the bioavailability of aflatoxins (AFs) from fish, and chicken and rabbit livers using an dialyzability approach. Ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was used to assess the aflatoxin content in samples, as well as in dialyzate and residue fractions after the procedure. A vortex-assisted dispersive liquid-liquid microextraction (VALLME) technique was used for preconcentrating AFs before determination. Read More

View Article and Full-Text PDF
September 2021

Accelerating Fe-Aqua Complex Reduction in an Efficient Solid-Liquid-Interfacial Fenton Reaction over the Mn-CNH Co-catalyst at Near-Neutral pH.

Environ Sci Technol 2021 Sep 15. Epub 2021 Sep 15.

School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, Georgia 30332, United States.

The sluggish regeneration rate of Fe and low operating pH still restrict the wider application of classical Fenton process (Fe/HO) for practical water treatment. To overcome these challenges, we exploit the Mn-CNH co-catalyst to construct a solid-liquid interfacial Fenton reaction and accelerate the Fe/Fe redox cycle at the interface for sustainably generating OH from HO activation. The Mn-CNH co-catalyst exhibits an excellent regeneration rate of Fe (∼65%) and a high tetracycline removal rate () of 0. Read More

View Article and Full-Text PDF
September 2021

Machine Learning Accelerated, High Throughput, Multi-Objective Optimization of Multiprincipal Element Alloys.

Small 2021 Sep 15:e2102972. Epub 2021 Sep 15.

Department of Mechanical Engineering, University of Maryland, College Park, MD, 20742, USA.

Multiprincipal element alloys (MPEAs) have gained surging interest due to their exceptional properties unprecedented in traditional alloys. However, identifying an MPEA with desired properties from a huge compositional space via a cost-effective design remains a grand challenge. To address this challenge, the authors present a highly efficient design strategy of MPEAs through a coherent integration of molecular dynamics (MD) simulation, machine learning (ML) algorithms, and genetic algorithm (GA). Read More

View Article and Full-Text PDF
September 2021

Photosynthetic Cyanobacteria-Hybridized Black Phosphorus Nanosheets for Enhanced Tumor Photodynamic Therapy.

Small 2021 Sep 15:e2102113. Epub 2021 Sep 15.

The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.

Photodynamic therapy (PDT) has attracted tremendous attention due to its advantages such as high safety and effectiveness compared to traditional radiotherapy and chemotherapy. However, the intratumoral hypoxic microenvironment will inevitably compromise the PDT effect of the highly oxygen-dependent type II photosensitizers, implicating the urgent demand for continuous intratumoral oxygenation. Herein, biocompatible photosynthetic cyanobacteria have been modified with inorganic two-dimensional black phosphorus nanosheets (BPNSs) to be a novel bioreactor termed as [email protected] Read More

View Article and Full-Text PDF
September 2021

Catalyst-free Vitrimer Cross-linked By Biomass-derived Compounds with Mechanical Robustness, Reprocessability and Multi-shape Memory Effects.

Macromol Rapid Commun 2021 Sep 15:e2100432. Epub 2021 Sep 15.

Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.

Vitrimerization of thermoset polymers plays an important role in addressing resource recovery and reuse. Vitrimer elastomers with good mechanical properties often require well-designed crosslinking agents or fillers, but this increases processing complexity or reduces vitrimer dynamic properties. In this report, we design a simple green strategy to build a strong vitrimer elastomer. Read More

View Article and Full-Text PDF
September 2021

[Health care reality of selected pediatric urologic surgeries in Germany from 2006 to 2019].

Urologe A 2021 Sep 15. Epub 2021 Sep 15.

Klinik und Poliklinik für Urologie, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307, Dresden, Deutschland.

Background: The conservative and surgical treatment of children is a fundamental pillar of the urological specialist training program and represents one of the core competencies within urological healthcare. The loss of this expertise has been a reoccurring topic within urologic occupational policy. The aim of this study is to analyse actual case numbers and to compare the distribution and dynamics of pediatric urologic surgeries between the specialist departments of urology and pediatric surgery in Germany. Read More

View Article and Full-Text PDF
September 2021

Going beyond the equilibrium crystal shape: re-tracing the morphological evolution in group 5 tetradymite nanocrystals.

Nanoscale 2021 Sep 15. Epub 2021 Sep 15.

Department of Materials Science & Engineering and Center for Artificial Synesthesia Materials Discovery, Yonsei University, Seoul 03722, Republic of Korea.

Nanocrystals of group 5 tetradymites MX (where M = Bi and Sb, X = Se and Te) are of high technological relevance in modern topological nanoelectronics. However, there is a current lack of a systematic understanding to predict the preferred nanocrystal morphology in experiments where commonly-used equilibrium thermodynamic models appear to fail. In this work, using first-principles DFT calculations with a rationally-extended atomistic thermodynamics approach coupled to implicit solvation models and Gibbs-Wulff shape constructions, we demonstrate that this absence of predictive power stems from the limitation of equilibrium thermodynamics. Read More

View Article and Full-Text PDF
September 2021

hydrogen nanogenerator for bimodal imaging guided synergistic photothermal/hydrogen therapies.

Nanoscale 2021 Sep 15. Epub 2021 Sep 15.

Department of Chemistry, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, China.

Multifunctional nanoagents integrating multiple therapeutic and imaging functions hold promise in the field of non-invasive and precise tumor therapies. However, the complex preparation process and uncertain drug metabolism of nanoagents loaded with various therapeutic agents or imaging agents greatly hinder its clinical applications. Developing simple and effective nanoagents that integrate multiple therapeutic and imaging functions remain a huge challenge. Read More

View Article and Full-Text PDF
September 2021

Structural stability and evolution of half-metallicity in BaCaMoO: interplay of hole- and electron-doping.

Phys Chem Chem Phys 2021 Sep 15;23(35):19472-19481. Epub 2021 Sep 15.

Department of Physics, University of Sargodha, Sargodha, 40100, Pakistan.

Half-metallic ferromagnetic materials have attracted a lot of attention due to their probable technological applications in spintronics. In this respect, doping plays a crucial role in tailoring or controlling the physical properties of the system. Herein, the impact of both hole and electron doping on the structural, electronic and magnetic properties of the recent high pressure synthesized non-magnetic insulator BaCaMoO double perovskite oxide are investigated by replacing one of the Mo ions with Nb and Tc. Read More

View Article and Full-Text PDF
September 2021

Pressure-induced bandgap engineering of lead-free halide double perovskite (NH)SnBr.

Phys Chem Chem Phys 2021 Sep 15;23(35):19308-19312. Epub 2021 Sep 15.

Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China.

Lead-free halide double perovskites (HDPs) have recently been proposed as potential stable and environment-friendly alternatives to lead-based halide perovskites. Bandgap engineering plays a vital role in the optoelectronic applications of HDP materials. In this study, methods combining high-pressure techniques with density functional theory calculations were employed to implement the bandgap engineering of a classic HDP-based (NH)SnBr. Read More

View Article and Full-Text PDF
September 2021

Phase transition and chemical reactivity of 1H-tetrazole under high pressure up to 100 GPa.

Phys Chem Chem Phys 2021 Sep 15;23(35):19503-19510. Epub 2021 Sep 15.

Center for High Pressure Science and Technology Advanced Research, Beijing 100094, P. R. China.

The pressure-induced phase transition and polymerization of nitrogen-rich molecules are widely focused on due to their extreme importance for the development of green high-energy-density materials. Here, we present a study of the phase-transition behaviour and chemical reaction of 1H-tetrazole up to 100 GPa using Raman, IR, X-ray diffraction, neutron diffraction techniques and theoretical calculations. A phase transition above 2. Read More

View Article and Full-Text PDF
September 2021

Electrochemical Pourbaix diagrams of Mg-Zn alloys from first-principles calculations and experimental thermodynamic data.

Phys Chem Chem Phys 2021 Sep 15;23(35):19602-19610. Epub 2021 Sep 15.

School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.

Mg-Zn alloys have attracted much attention as biodegradable alloys owing to their superior mechanical properties and excellent biocompatibility. However, their corrosion/degradation behaviour has become a major issue for various biomedical applications. To understand their corrosion behaviours in aqueous environments, the first-principles informed Pourbaix diagrams, that is, electrochemical phase diagrams with respect to electrode potential and solution pH, were constructed for Mg-Zn alloys and compared with experimental observations. Read More

View Article and Full-Text PDF
September 2021

Fabrication and application of composite adsorbents made by one-pot electrochemical exfoliation of graphite in surfactant ionic liquid/nanocellulose mixtures.

Phys Chem Chem Phys 2021 Sep 15;23(35):19313-19328. Epub 2021 Sep 15.

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.

Previously, surfactant-assisted exfoliated graphene oxide (sEGO) formed with the triple-chain surfactant TC14 (sodium 1,4-bis(neopentyloxy)-3-(neopentylcarbonyl)-1,4-dioxobutane-2-sulfonate) was applied in wastewater treatment. The extent of dye-removal and the adsorption capacity of the sEGO formed with this triple-chain surfactant outperformed those of two other systems, namely, the di-chain version of TC14 (AOT14; sodium 1,2-bis-(2,2-dimethyl-propoxycarbonyl)-ethanesulfonate) and the single-chain surfactant sodium -dodecylsulfate. In the present study, to further optimise the surfactant chemical structure, the sodium ion of TC14 was substituted with 1-butyl-3-methyl-imidazolium (BMIM) generating surfactant ionic liquids (SAILs; 1-butyl-3-imidazolium 1,4-bis(neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulfonate), hereafter denoted as BMIM-TC14. Read More

View Article and Full-Text PDF
September 2021

Defect evolution behaviors from single sulfur point vacancies to line vacancies in monolayer molybdenum disulfide.

Phys Chem Chem Phys 2021 Sep 15;23(35):19525-19536. Epub 2021 Sep 15.

Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada.

Two-dimensional monolayer transition metal dichalcogenides (TMDs) are promising candidates for many novel nanoelectronic and optoelectronic applications due to their exceptional electronic, optical, chemical and mechanical properties. Experimentally, single chalcogen point vacancies caused by electron beam irradiation are found to agglomerate into line vacancy defects in monolayer TMDs. Herein, the corresponding defect evolution behaviors from single sulfur point vacancies to line vacancies in the monolayer molybdenum disulfide (MoS) have been systematically studied using molecular dynamics and first principles calculations. Read More

View Article and Full-Text PDF
September 2021