30,330 results match your criteria diffusion properties

First-principles study of Mn antisite defect in Li2MnO3.

J Phys Condens Matter 2021 Jul 22. Epub 2021 Jul 22.

State Key Laboratory of Powder Metallurgy, Central South University, Lushan South Road, Changsha, 410083, CHINA.

Lithium-rich layered Li2MnO3 is regarded as a new generation cathode material for lithium-ion batteries because of its high energy density. Due to the different preparation methods and technological parameters, there are a lot of intrinsic defects in Li2MnO3. One frequently observed defect in experiments is Mn antisite defect (MnLi). Read More

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Functional effectiveness of double essential [email protected] starch/microcrystalline cellulose as active antibacterial packaging.

Int J Biol Macromol 2021 Jul 19;186:873-885. Epub 2021 Jul 19.

School of Food and Biological Engineering, Hefei University of Technology, 230009 Hefei, Anhui, PR China; Anhui Institute of Agro-Products Intensive Processing Technology, 230009 Hefei, Anhui, PR China.

In this work, two combinations of double EOs, i.e., α-terpineol: eugenol (α-T:Eu) and carvacrol:eugenol (CA:Eu), are used to develop the active antibacterial films of double [email protected] starch/microcrystalline cellulose ([email protected]). Read More

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Facile Production of Phosphorene Nanoribbons towards Application in Lithium Metal Battery.

Adv Mater 2021 Jul 22:e2102083. Epub 2021 Jul 22.

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

Like phosphorene, phosphorene nanoribbon (PNR) promises exotic properties but unzipping phosphorene into edge-defined PNR is non-trivial because of uncontrolled cutting of phosphorene along random directions. Here a facile electrochemical strategy to fabricate zigzag-edged PNRs in high yield (>80%) is reported. The presence of chemically active zigzag edges in PNR allows it to spontaneously react with Li to form a Li ion conducting Li P phase, which can be used as a protective layer on Li metal anode in lithium metal batteries (LMBs). Read More

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B -Corrected T1 Mapping in Lung Cancer: Repeatability, Reproducibility, and Identification of Histological Types.

J Magn Reson Imaging 2021 Jul 22. Epub 2021 Jul 22.

Siemens Healthineers Digital Technology Co., Ltd, Shanghai, China.

Background: T1 mapping can potentially quantitatively assess the intrinsic properties of tumors. B correction can reduce the magnetic field inhomogeneity.

Purpose: To assess the repeatability and reproducibility of B -corrected T1 mapping for lung cancer and the ability to identify pathological types. Read More

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Molecular detection of Extended-Spectrum β-lactamases (ESBLs) and biofilm formation in uropathogen in Iran.

Med J Islam Repub Iran 2021 5;35:72. Epub 2021 Jun 5.

Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.

Uropathogenic is one of the well-kown uropathogens that have the main rule in biofilm formation. Increased prevalence of ESBL enzyme is one of the therapeutic problems. However, the aims of this study were to characterize the ability of biofilm formation and ESBL-producing isolates produced by urinary tract infection's to identify the prevalence of this type of infection in the studied area. Read More

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Control of Virulent Originating from Dairy Products and Cattle Environment Using Marine Algal Extracts, Silver Nanoparticles Thereof, and Quaternary Disinfectants.

Infect Drug Resist 2021 15;14:2721-2739. Epub 2021 Jul 15.

Department of Food Hygiene and Control (Milk Hygiene), Faculty of Veterinary Medicine, South Valley University, Qena, 83523, Egypt.

Introduction: is an important foodborne pathogen of public- and animal-health concern globally. The persistence of in the dairy-processing environment has multifactorial causes, including lack of hygiene, inefficient cleaning, and improper disinfection practices.

Materials And Methods: A total of 300 dairy-product and environmental samples were collected from dairy-cattle facilities and local dairy shops and vendors in Qena, Egypt. Read More

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First experimental evidence of the piezoelectric nature of struvite.

Sci Rep 2021 Jul 21;11(1):14860. Epub 2021 Jul 21.

Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500, Chorzów, Poland.

In this paper, we present the first experimental evidence of the piezoelectric nature of struvite (MgNHPO·6HO). Using a single diffusion gel growth technique, we have grown struvite crystals in the form of plane parallel plates. For struvite crystals of this shape, we measured the piezoelectric coefficients d and d. Read More

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Adsorptive removal of pharmaceutical pollutants by defective metal organic framework UiO-66: Insight into the contribution of defects.

Chemosphere 2021 Oct 26;281:130997. Epub 2021 May 26.

Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing, 100084, PR China. Electronic address:

The development of defective structure in MOFs can offer a novel approach to tailor the properties of MOFs-type adsorbent for better adsorption performance. In this study, the contribution of defective structure in UiO-66 to the adsorptive removal of pharmaceutical pollutants from aqueous solution was investigated. The results showed that the controlled defects in UiO-66 greatly affected adsorption equilibrium time, adsorption capacity and adsorption selectivity. Read More

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October 2021

Cortical and white matter correlates of language-learning aptitudes.

Hum Brain Mapp 2021 Jul 20. Epub 2021 Jul 20.

Department of Linguistics and Phonetics, Lund University, Lund, Sweden.

People learn new languages with varying degrees of success but what are the neuroanatomical correlates of the difference in language-learning aptitude? In this study, we set out to investigate how differences in cortical morphology and white matter microstructure correlate with aptitudes for vocabulary learning, phonetic memory, and grammatical inferencing as measured by the first-language neutral LLAMA test battery. We used ultra-high field (7T) magnetic resonance imaging to estimate the cortical thickness and surface area from sub-millimeter resolved image volumes. Further, diffusion kurtosis imaging was used to map diffusion properties related to the tissue microstructure from known language-related white matter tracts. Read More

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Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2.

Sci Rep 2021 07 20;11(1):14805. Epub 2021 Jul 20.

Department of Pathophysiology and Transplantation, University of Milano, Don C. Gnocchi Foundation, IRCCS, Milan, Italy.

Solar UV-C photons do not reach Earth's surface, but are known to be endowed with germicidal properties that are also effective on viruses. The effect of softer UV-B and UV-A photons, which copiously reach the Earth's surface, on viruses are instead little studied, particularly on single-stranded RNA viruses. Here we combine our measurements of the action spectrum of Covid-19 in response to UV light, Solar irradiation measurements on Earth during the SARS-CoV-2 pandemics, worldwide recorded Covid-19 mortality data and our "Solar-Pump" diffusive model of epidemics to show that (a) UV-B/A photons have a powerful virucidal effect on the single-stranded RNA virus Covid-19 and that (b) the Solar radiation that reaches temperate regions of the Earth at noon during summers, is sufficient to inactivate 63% of virions in open-space concentrations (1. Read More

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A high capacity small molecule quinone cathode for rechargeable aqueous zinc-organic batteries.

Nat Commun 2021 Jul 20;12(1):4424. Epub 2021 Jul 20.

Department of Chemistry, Northeastern University, Shenyang, China.

Rechargeable aqueous zinc-organic batteries are promising energy storage systems with low-cost aqueous electrolyte and zinc metal anode. The electrochemical properties can be systematically adjusted with molecular design on organic cathode materials. Herein, we use a symmetric small molecule quinone cathode, tetraamino-p-benzoquinone (TABQ), with desirable functional groups to protonate and accomplish dominated proton insertion from weakly acidic zinc electrolyte. Read More

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Photonics of meso-substituted carbocyanine dyes in solutions and in complexes with DNA.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Jul 12;263:120171. Epub 2021 Jul 12.

N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, Moscow 119334, Russia. Electronic address:

Spectral-fluorescent and photochemical properties (photoisomerization and generation of the triplet state) of meso-substituted cationic carbocyanine dyes, 3,3'-di-(β-hydroxyethyl)-5,5'-dimethoxy-9-ethylthiacarbocyanine iodide (K1) and 3,3'-di-(β-hydroxyethyl)-9-methylthiacarbocyanine iodide (K2), have been studied in solutions and in the presence of DNA. In solutions, on passing from acetonitrile to dioxane, a growth of fluorescence of the dyes is observed due to a shift of the equilibrium of cis/trans isomers toward the fluorescent trans-isomer. Upon flash photolysis of dye solutions in dioxane, the formation and subsequent decay of the cis-photoisomers of the dyes are observed. Read More

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Application of clayware ceramic separator modified with silica in microbial fuel cell for bioelectricity generation during rice mill wastewater treatment.

Water Sci Technol 2021 Jul;84(1):66-76

School of Infrastructure, Indian Institute of Technology Bhubaneswar, Argul, Khordha, Odisha 752050, India.

Ceramic separators have recently been investigated as low-cost, robust, and sustainable separators for application in microbial fuel cells (MFC). In the present study, an attempt was made to develop a low-cost MFC employing a clayware ceramic separator modified with silica. The properties of separators with varying silica content (10%-40% w/w) were evaluated in terms of oxygen and proton diffusion. Read More

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Possibilities of the Utilization of Ferritic Nitrocarburizing on Case-Hardening Steels.

Materials (Basel) 2021 Jul 2;14(13). Epub 2021 Jul 2.

Department of Combat and Special Vehicles, Faculty of Military Technology, University of Defence, 662 10 Brno, Czech Republic.

This paper is devoted to the possibilities of the utilization of chosen chemical heat treatment technologies on steels used for manufacturing highly stressed components of military vehicles and weapons systems. The technologies chosen for this research are plasma ferritic nitrocarburizing and ferritic nitrocarburizing in a gaseous atmosphere. These technologies were applied on a steel equivalent 1. Read More

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Hydrogen-Assisted Brittle Fracture Behavior of Low Alloy 30CrMo Steel Based on the Combination of Experimental and Numerical Analyses.

Materials (Basel) 2021 Jul 2;14(13). Epub 2021 Jul 2.

Key Laboratory of Disaster Prevent and Structural Safety, Guangxi Key Laboratory Disaster Prevent and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China.

Compact-tension (CT) specimens made of low alloy 30CrMo steels were hydrogen-charged, and then subjected to the fracture toughness test. The experimental results revealed that the higher crack propagation and the lower crack growth resistance (CTOD-R curve) are significantly noticeable with increasing hydrogen embrittlement (HE) indexes. Moreover, the transition in the microstructural fracture mechanism from ductile (microvoid coalescence (MVC)) without hydrogen to a mixed quasi-cleavage (QC) fracture and QC + intergranular (IG) fracture with hydrogen was observed. Read More

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Variation of Durability and Strength Parameters of Pumice Based Mixtures.

Materials (Basel) 2021 Jul 1;14(13). Epub 2021 Jul 1.

Civil and Environmental Engineering Department, California State University, Fullerton, CA 92834, USA.

The numerical modelling of chloride penetration into concrete is very sensitive to the correct description of the input data. In the recent era, high-performance concrete (HPC), which combines Portland cement and other supplementary cementitious materials, has been gaining attraction due to their desirable material properties and durability. The presented results show the application of the modified approach for the evaluation of the suitability of the time-dependent model for the variation of the diffusion coefficient. Read More

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Atomic Undercoordination in Ag Islands on Ru(0001) Grown via Size-Selected Cluster Deposition: An Experimental and Theoretical High-Resolution Core-Level Photoemission Study.

J Phys Chem C Nanomater Interfaces 2021 May 28;125(17):9556-9563. Epub 2021 Apr 28.

Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy.

The possibility of depositing precisely mass-selected Ag clusters (Ag, Ag, and Ag) on Ru(0001) was instrumental in determining the importance of the in-plane coordination number (CN) and allowed us to establish a linear dependence of the Ag 3d core-level shift on CN. The fast cluster surface diffusion at room temperature, caused by the low interaction between silver and ruthenium, leads to the formation of islands with a low degree of ordering, as evidenced by the high density of low-coordinated atomic configurations, in particular CN = 4 and 5. On the contrary, islands formed upon Ag deposition show a higher density of atoms with CN = 6, thus indicating the formation of islands with a close-packed atomic arrangement. Read More

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Determination of Diffusion Kinetics of Ketamine in Brain Tissue: Implications for Mechanistic Studies of Drug Actions.

Front Neurosci 2021 1;15:678978. Epub 2021 Jul 1.

Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, IA, United States.

Ketamine has been in use for over 50 years as a general anesthetic, acting primarily through blockade of -methyl-D-aspartate receptors in the brain. Recent studies have demonstrated that ketamine also acts as a potent and rapid-acting antidepressant when administered at sub-anesthetic doses. However, the precise mechanism behind this effect remains unclear. Read More

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Formulation and optimization of dimenhydrinate emulgels for topical delivery using response surface methodology.

Pak J Pharm Sci 2021 Jan;34(1(Supplementary)):245-255

Department of Pharmacy, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan.

Development of dimenhydrinate (DMN) emulgel formulation has been described in this work with enhanced permeation for transdermal delivery of DMN for effective management of motion sickness. Various DMN emulgel formulations were prepared using central composite design in response surface methodology. Propylene glycol and olive oil were used in varying ratios as permeation enhancers along-with carbopol-934 as gelling agent. Read More

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January 2021

Relaxation dynamics of alkyl derivatives of fluorescein MitoFluo and C-Fl in solutions with liposomes.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Jul 5;263:120145. Epub 2021 Jul 5.

Ioffe Institute, 26 Polytekhnicheskaya, St.Petersburg 194021, Russia.

We present results of experimental and theoretical studies of excited state dynamics in two alkyl derivatives of fluorescein, MitoFluo and C-Fl in solutions with liposomes. The liposomes DOPC and soybeanPC + 20% Cardiolipin (Azo-Cl), modelling cellular and inner mitochondrial membranes, respectively, were used in experiments. Both types of liposomes were shown to reduce significantly the fluorescence quantum yield as compared to that of pure fluorescein derivatives in solutions, while DOPC liposomes also caused a noticeable (ca 10 nm) red shift of fluorescence maximum. Read More

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Atomic Layer Deposition of Textured Li Ti O : A High-Power and Long-Cycle Life Anode for Lithium-Ion Thin-Film Batteries.

Small 2021 Jul 17:e2102635. Epub 2021 Jul 17.

Department of Chemistry, Humboldt-University Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany.

The "zero-strain" Li Ti O is an attractive anode material for 3D solid-state thin-film batteries (TFB) to power upcoming autonomous sensor systems. Herein, Li Ti O thin films fabricated by atomic layer deposition (ALD) are electrochemically evaluated for the first time. The developed ALD process with a growth per cycle of 0. Read More

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Extending the timescale of molecular simulations by using time-temperature superposition: rheology of ionic liquids.

Soft Matter 2021 Jul 16. Epub 2021 Jul 16.

Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.

Molecular dynamics simulations are used to determine the temperature dependence of the dynamic and rheological properties of a model imidazolium-based ionic liquid (IL). The simulation results for the volumetric properties of the IL are in good agreement with the experimental results. The temperature dependence of the diffusion coefficient of anions and cations follows the Vogel-Fulcher-Tammann equation over the range of the temperatures studied. Read More

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An efficient and combined placental -ADC acquisition in pregnancies with and without pre-eclampsia.

Magn Reson Med 2021 Jul 15. Epub 2021 Jul 15.

Center for Medical Engineering, King's College London, London, UK.

Purpose: To provide a new approach to jointly assess microstructural and molecular properties of the human placenta in vivo fast and efficiently and to present initial evidence in cohorts of healthy pregnancies and those affected by pre-eclampsia.

Methods: Slice and diffusion preparation shuffling, built on the previously proposed ZEBRA method, is presented as a robust and fast way to obtain and apparent diffusivity coefficient (ADC) values. Joint modeling and evaluation is performed on a cohort of healthy and pre-eclamptic participants at 3T. Read More

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Assessing the effects of increasing conjugation length on exciton diffusion: from small molecules to the polymeric limit.

Phys Chem Chem Phys 2021 Jul 16. Epub 2021 Jul 16.

Institute of Physics, University of Brasilia, 70919-970, Brasilia, Brazil.

Organic solar cells (OSC) generally contain long-chain π-conjugated polymers as donor materials, but, more recently, small-molecule donors have also attracted considerable attention. The nature of these compounds is of crucial importance concerning the various processes that determine device performance, among which singlet exciton diffusion is one of the most relevant. The efficiency of the diffusion mechanism depends on several aspects, from system morphology to electronic structure properties, which vary importantly with molecular size. Read More

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Crucial Role of PLGA Nanoparticles in Mitigating the Amiodarone-Induced Pulmonary Toxicity.

Int J Nanomedicine 2021 8;16:4713-4737. Epub 2021 Jul 8.

Pharmaceutics Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.

Background: Amiodarone (AMD) is a widely used anti-arrhythmic drug, but its administration could be associated with varying degrees of pulmonary toxicity. In attempting to circumvent this issue, AMD-loaded polymeric nanoparticles (AMD-loaded NPs) had been designed.

Materials And Methods: AMD was loaded in NPs by the nanoprecipitation method using two stabilizers: bovine serum albumin and Kolliphor P 188. Read More

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Characterization of the Interface of Heat-pressed Glass-Ceramic Masses on Metal Support Cr-Co in Metal-Ceramic Prosthetic Restorations.

J Contemp Dent Pract 2021 Apr 1;22(4):335-341. Epub 2021 Apr 1.

Department of Prosthodontics, National and Kapodistrian University of Athens, Athens, Greece.

Aim And Objective: The aim and objective of this study is to evaluate the interface between heat-pressed glass-ceramic masses on a Cr-Co metal substrate using a scanning electron microscope and an X-ray energy dispersion spectrometer.

Materials And Methods: A pressed porcelain-leucite-based ceramic (IPS InLine press-on-metal (PoM); Ivoclar Vivadent AG) was used. Three cylindrical metal specimens cast (diameter 5 mm, height 1. Read More

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Effect of optical magnification on the detection of the reduced scattering coefficient in the blue regime: theory and experiments.

Opt Express 2021 Jul;29(14):22228-22239

Imaging turbid media is range limited. In contrast, sensing the medium's optical properties is possible in larger depths using the iterative multi-plane optical properties extraction technique. It analyzes the reconstructed reemitted light phase image. Read More

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Metal-organic framework derived vanadium-doped [email protected] nanotablets for high-performance sodium storage.

J Colloid Interface Sci 2021 Jun 29;604:188-197. Epub 2021 Jun 29.

State Key Lab of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China. Electronic address:

Titanium dioxide (TiO) as a potential anode material for sodium-ion batteries (SIBs) suffers from the intrinsic poor electronic conductivity and sluggish ionic diffusivity, thus usually leading to the inferior electrochemical performance. Herein, we demonstrate a facile strategy to enhance the sodium storage performance of TiOvia vanadium (V) doping, using the pre-synthesized V-doped Ti-based metal-organic framework (MOF, MIL-125) as the precursor, which can be converted into the V-doped TiO with simultaneous carbon hybridization and controlled V-doping amount (denote as [email protected], where × represents the V/Ti molar ratio (R)). V-doping not only affects the morphology of the MIL-125 changing from thick to thin nanotablets, but also greatly enhances the electrochemical performance of the [email protected] Read More

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Pharmaceutical nanocrystals: A promising approach for improved topical drug delivery.

Drug Discov Today 2021 Jul 13. Epub 2021 Jul 13.

Solid State Pharmaceutics Laboratory, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector-67, S.A.S. Nagar, Mohali, Punjab 160 062, India. Electronic address:

The barrier function of skin and the non-optimal physicochemical properties of drugs present challenges to the skin penetration of many drugs, motivating the development of novel drug-delivery systems. Recently, nanocrystal-based formulations have been investigated for topical drug delivery and have demonstrated improved skin penetration. This review highlights barriers in skin penetration, current techniques to improve topical delivery and the application of nanocrystals to conquer obstacles for topical delivery. Read More

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Polysaccharide-reinforced amyloid fibril hydrogels and aerogels.

Nanoscale 2021 Jul 15. Epub 2021 Jul 15.

ETH Zürich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, 8092 Zürich, Switzerland. and ETH Zürich, Department of Materials, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland.

β-Lactoglobulin amyloid fibrils are bio-colloids of high interest in many fields (e.g. water purification, cell growth, drug delivery and sensing). Read More

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