6,402 results match your criteria properties fluoride

Metal-free glycosylation with glycosyl fluorides in liquid SO.

Beilstein J Org Chem 2021 29;17:964-976. Epub 2021 Apr 29.

Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, P. Valdena str. 3, Riga, LV-1048, Latvia.

Liquid SO is a polar solvent that dissolves both covalent and ionic compounds. Sulfur dioxide possesses also Lewis acid properties, including the ability to covalently bind Lewis basic fluoride ions in a relatively stable fluorosulfite anion (FSO). Herein we report the application of liquid SO as a promoting solvent for glycosylation with glycosyl fluorides without any external additive. Read More

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Prospect of positron emission tomography for abdominal aortic aneurysm risk stratification.

J Nucl Cardiol 2021 May 11. Epub 2021 May 11.

Leeds Institute of Cardiovascular and Metabolic Medicine, School of Medicine, University of Leeds, 8.49 Worsley Building, Clarendon Way, Leeds, LS2 9NL, United Kingdom.

Abdominal aortic aneurysm (AAA) disease is characterized by an asymptomatic, permanent, focal dilatation of the abdominal aorta progressing towards rupture, which confers significant mortality. Patient management and surgical decisions rely on aortic diameter measurements via abdominal ultrasound surveillance. However, AAA rupture can occur at small diameters or may never occur at large diameters, implying that anatomical size is not necessarily a sufficient indicator. Read More

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Bond dissociation energies of low-valent lanthanide hydroxides: lower limits from ion-molecule reactions and comparisons with fluorides.

Phys Chem Chem Phys 2021 May 11. Epub 2021 May 11.

Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Despite that bond dissociation energies (BDEs) are among the most fundamental and relevant chemical properties they remain poorly characterized for most elementary lanthanide hydroxides and halides. Lanthanide ions Ln+ = Eu+, Tm+ and Yb+ are here shown to react with H2O to yield hydroxides LnOH+. Under low-energy conditions such reactions must be exothermic, which implies a lower limit of 499 kJ mol-1 for the Ln+-OH BDEs. Read More

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Fabrication of Nd and Yb doped NIR emitting nano fluorescent probe: A candidate for bioimaging applications.

Mater Sci Eng C Mater Biol Appl 2021 Jun 1;125:112095. Epub 2021 Apr 1.

Department of Physics, Periyar University, Salem 636 011, Tamil Nadu, India. Electronic address:

The intentional design of rare earth doped luminescent architecture exhibits unique optical properties and it can be considered as a promising and potential probe for optical imaging applications. Calcium fluoride (CaF) nanoparticles doped with optimum concentration of Nd and Yb as sensitizer and activator, respectively, were synthesized by wet precipitation method and characterized by x-ray diffraction (XRD) and photoluminescence. In spite of the fact that the energy transfer takes place from Nd to Yb, the luminescence intensity was found to be weak due to the lattice defects generated from the doping of trivalent cations (Nd and Yb) for divalent host cations (Ca). Read More

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Synthesis and characterization of novel acylthiourea compounds used in ions recognition and sensing in organic media.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Apr 20;258:119860. Epub 2021 Apr 20.

Department of Inorganic Chemistry, University of Bucharest, 23 Dumbrava Rosie st, sector 2, Bucharest 020464, Romania. Electronic address:

A series of novel N-acyl-N'-aryl thiourea derivatives were designed and prepared with the aim to develop dual responsive receptors for anions and cations. The structure of the new products was confirmed by NMR spectroscopy (C and H), elemental analysis, and IR spectroscopy. Their thermal stability was studied by thermogravimetric analysis (TG) and it was found that these acyl thiourea derivatives are stable up to 160 °C. Read More

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Effect of fluoride on mechanical properties of NiTi and CuNiTi orthodontic archwires: an in vitro study.

Dental Press J Orthod 2021 30;26(2):e212020. Epub 2021 Apr 30.

Bharati Vidyapeeth Dental College & Hospital, Department of Prosthodontics (Sangli/MH, India).

Introduction: After debonding, white spot may appear on the area below the bracket, which is the early clinical sign of carious lesion. There is increased caries risk underneath and adjacent to orthodontic bands and brackets, which call for maximum use of caries preventive procedures using various fluoride application methods.

Objective: The aim of the study was to evaluate alterations in the mechanical properties (modulus of elasticity and yield strength) in loading and unloading phases for different orthodontic archwires (nickel-titanium [NiTi] and copper-nickel-titanium [CuNiTi]) when exposed routinely to fluoride prophylactic agents for a predetermined period of time. Read More

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Hydrogen Bond Acceptor Propensity of different Fluorine Atom Types: An Analysis of Experimentally- and Computationally-derived Parameters.

Chemistry 2021 May 5. Epub 2021 May 5.

Trento, Lavis, ITALY.

The propensity of organic fluorine acting as a weak hydrogen bond acceptor (HBA) in intermolecular and intramolecular interactions has been the subject of many experimental and theoretical studies often reaching different conclusions. Over the last few years new and stronger evidences have emerged for the direct involvement of fluorine in weak hydrogen bond (HB) formation. However, not all the fluorine atom types can act as weak HBA. Read More

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Studies on the electrostatic effects of stretched PVDF films and nanofibers.

Nanoscale Res Lett 2021 May 3;16(1):79. Epub 2021 May 3.

Sino-Danish Center for Education and Research (SDC), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000, Aarhus C, Denmark.

The electroactive β-phase in Poly (vinylidene fluoride, PVDF) is the most desirable conformation due to its highest pyro- and piezoelectric properties, which make it feasible to be used as flexible sensors, wearable electronics, and energy harvesters etc. In this study, we successfully developed a method to obtain high-content β-phase PVDF films and nanofiber meshes by mechanical stretching and electric spinning. The phase transition process and pyro- and piezoelectric effects of stretched films and nanofiber meshes were characterized by monitoring the polarized light microscopy (PLM) images, outputting currents and open-circuit voltages respectively, which were proved to be closely related to stretching ratio (λ) and concentrations. Read More

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All-Organic Dielectrics with High Breakdown Strength and Energy Storage Density for High-Power Capacitors.

Macromol Rapid Commun 2021 May 3:e2100116. Epub 2021 May 3.

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

Polymer-based film capacitors with high breakdown strength and excellent flexibility are crucial in the field of advanced electronic devices and electric power systems. Although massive works are carried to enhance the energy storage performances, it is still a great challenge to improve the energy density of polymer composites under the premise of large-scale industrial production. Herein, a general strategy is proposed to improve the intrinsic breakdown strength and energy storage performances by blending core-shell structured methyl methacrylate-butadiene-styrene (MBS) rubber particles into a polymer matrix. Read More

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Improvement of quantum efficiency through Gd to Eu energy transfer in YF Phosphor.

Luminescence 2021 Apr 30. Epub 2021 Apr 30.

Department of Physics, Sant Gadge Baba Amravati University, Amravati, INDIA.

This paper reports the energy transfer from Gd to Eu in YF and consequential down-conversion luminescence for YF : Gd , Eu fluoride phosphor. The phosphor synthesised by soft chemical route followed by reactive atmospheric process (RAP). Because of the wide band gap in YF and the proper energy site for S - G transitions of Gd ions, fluoride YF doped with Gd - Eu and studied in the VUV spectral regions. Read More

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Multifunctional filtration membrane with anti-viscous-oils-fouling capacity and selective dyes adsorption ability for complex wastewater remediation.

J Hazard Mater 2021 Jul 10;413:125379. Epub 2021 Feb 10.

Chengdu Evermaterials Co., Ltd, Chengdu, Sichuan 610500, China. Electronic address:

Multifunctional filtration membranes (MFMs), which can both effectively separate oil and selectively remove dyes from polluted aquatic system with robust anti-viscous-oil-fouling capacity, strong chemical/physical resistance, and long cycled stability, are highly required but still a challenge to be realized. Herein, a simple route has been demonstrated to address this challenge aforementioned by decorating both halloysite nanotubes (HNTs) and zwitterionic poly (sulfobetaine methyl methacrylate) (PSBMA) on the microporous polyvinylidene fluoride (PVDF) membrane surface via modified polydopamine (PDA) coating route. The as-prepared membrane exhibits super-hydrophilic/underwater super-oleophobic performance and high water permeation flux (32529 ± 278 L m h at 0. Read More

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Comparative evaluation of compressive and flexural strength, fluoride release and bacterial adhesion of GIC modified with CPP-ACP, bioactive glass, chitosan and MDPB.

J Dent Res Dent Clin Dent Prospects 2021 13;15(1):16-21. Epub 2021 Feb 13.

Department of Conservative Dentistry and Endodontics, Adhiparasakthi Dental College & Hospital, Melmaruvathur, India.

This study evaluated the incorporation of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), calcium sodium phosphosilicate bioactive glass (BAG), chitosan (CH), and methacryloyloxydodecylpyridinium bromide (MDPB) on the compressive and flexural strength, fluoride (F ) release, and bacterial adhesion of conventional glass-ionomer cement (C-GIC). Modifications were implemented by adding CPP-ACP, BAG, and CH to the glass powder, while MDPB-GIC was prepared by incorporating MDPB to the liquid of C-GIC. Custom-made molds were used for specimen preparation. Read More

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February 2021

Preparation, Physical Properties, and Applications of Water-Based Functional Polymer Inks.

Polymers (Basel) 2021 Apr 27;13(9). Epub 2021 Apr 27.

Instituto de Estructura de la Materia, IEM-CSIC, C/Serrano 121, 28006 Madrid, Spain.

In this study, water-based functional polymer inks are prepared using different solvent displacement methods, in particular, polymer functional inks based on semiconducting polymer poly(3-hexylthiophene) and the ferroelectric polymer poly(vinylidene fluoride) and its copolymers with trifluoroethylene. The nanoparticles that are included in the inks are prepared by miniemulsion, as well as flash and dialysis nanoprecipitation techniques and we discuss the properties of the inks obtained by each technique. Finally, an example of the functionality of a semiconducting/ferroelectric polymer coating prepared from water-based inks is presented. Read More

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Low Dose of Fluoride in the Culture Medium of Promotes Its Growth and Enhances Bioactives with Antioxidant and Anticancer Properties.

J Fungi (Basel) 2021 Apr 28;7(5). Epub 2021 Apr 28.

Graduate School of Life & Environmental Science, University of Tsukuba, Ibaraki 305-8575, Japan.

possesses several compounds with medicinal properties, and is commonly used in traditional Chinese functional food and medicine for a variety of health benefits. Because of its rare occurrence in nature, the market demand for artificial is on the rise. Furthermore, efforts to increase its bioactive ingredients have also been considered in research. Read More

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Characterizing Bacterial Cellulose Produced by H-110 on Molasses Medium and Obtaining a Biocomposite Based on It for the Adsorption of Fluoride.

Polymers (Basel) 2021 Apr 28;13(9). Epub 2021 Apr 28.

Department of Biotechnology, Bioengineering and Biochemistry, National Research Ogarev Mordovia State University, 430005 Saransk, Russia.

Currently, there is an increased demand for biodegradable materials in society due to growing environmental problems. Special attention is paid to bacterial cellulose, which, due to its unique properties, has great prospects for obtaining functional materials for a wide range of applications, including adsorbents. In this regard, the aim of this study was to obtain a biocomposite material with adsorption properties in relation to fluoride ions based on bacterial cellulose using a highly productive strain of H-110 on molasses medium. Read More

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The Influences of 1-Butyl-3-Methylimidazolium Tetrafluoroborate on Electrochemical, Thermal and Structural Studies as Ionic Liquid Gel Polymer Electrolyte.

Polymers (Basel) 2021 Apr 14;13(8). Epub 2021 Apr 14.

Department of Chemical Sciences, Faculty of Sciences and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.

After decades of development, ionic liquid gel polymer electrolytes (ILGPEs) are currently experiencing a renaissance as a promising electrolyte to be used in electrochemical devices. Their inherent tendency towards poor electrochemical properties have limited their applications and commercialization activities. Henceforth, gel polymer electrolyte (GPE) is being introduced to alleviate the abovementioned issues. Read More

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Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb for Efficient Near-Infrared Upconversion Luminescence of Tm.

Nanomaterials (Basel) 2021 Apr 18;11(4). Epub 2021 Apr 18.

Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 511443, China.

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYbF nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb when the doping concentration varies from 0. Read More

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On the Solubility and Stability of Polyvinylidene Fluoride.

Polymers (Basel) 2021 Apr 21;13(9). Epub 2021 Apr 21.

WMG, International Manufacturing Centre, University of Warwick, Coventry CV4 7AL, UK.

This literature review covers the solubility and processability of fluoropolymer polyvinylidine fluoride (PVDF). Fluoropolymers consist of a carbon backbone chain with multiple connected C-F bonds; they are typically nonreactive and nontoxic and have good thermal stability. Their processing, recycling and reuse are rapidly becoming more important to the circular economy as fluoropolymers find widespread application in diverse sectors including construction, automotive engineering and electronics. Read More

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The Influence Mechanism of Temperature and Storage Period on Polarization Properties of Poly (Vinylidene Fluoride-Trifluoroethylene) Ultrathin Films.

Membranes (Basel) 2021 Apr 21;11(5). Epub 2021 Apr 21.

School of Mathematics, Physics and Statistics, Shanghai University of Engineering Science, Shanghai 201620, China.

The effect of testing temperature and storage period on the polarization fatigue properties of poly (vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) ultrathin film devices were investigated. The experimental results show that, even after stored in air for 150 days, the relative remanent polarization (Pr/Pr(0)) of P(VDF-TrFE) of ultrathin films can keep at a relatively high level of 0.80 at 25 °C and 0. Read More

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Bioactivity Performance of Pure Mg after Plasma Electrolytic Oxidation in Silicate-Based Solutions.

Molecules 2021 Apr 6;26(7). Epub 2021 Apr 6.

Faculty of Chemistry, Silesian University of Technology, 44-100 Gliwice, Poland.

The biodegradable metals, including magnesium (Mg), are a convenient alternative to permanent metals but fast uncontrolled corrosion limited wide clinical application. Formation of a barrier coating on Mg alloys could be a successful strategy for the production of a stable external layer that prevents fast corrosion. Our research was aimed to develop an Mg stable oxide coating using plasma electrolytic oxidation (PEO) in silicate-based solutions. Read More

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Root Caries Preventive Effect of Varnishes Containing Fluoride or Fluoride + Chlorhexidine/Cetylpyridinium Chloride In Vitro.

Microorganisms 2021 Apr 1;9(4). Epub 2021 Apr 1.

Section for Oral Ecology and Caries Control, Department of Dentistry and Oral Health, Aarhus University, Vennelyst Boulevard 9, 8000 Aarhus C, Denmark.

Caries preventive varnishes containing only fluoride might differ from those containing a combination of fluoride and antimicrobial components in terms of mineralization properties and their impact on the cariogenic biofilm. We compared a fluoride and a fluoride + chlorhexidine (CHX)/cetylpyridinium chloride (CPC) varnish on root caries formation in vitro. One hundred bovine root dentin samples were allocated to five groups ( = 20/group): (1) 7700 ppm fluoride varnish (Fluorprotector S (F)), (2) experimental placebo varnish for F (F-P), (3) 1400 ppm fluoride + 0. Read More

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Recent Development of Active Ingredients in Mouthwashes and Toothpastes for Periodontal Diseases.

Molecules 2021 Apr 1;26(7). Epub 2021 Apr 1.

The Center for Wound Healing and Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.

Periodontal diseases like gingivitis and periodontitis are primarily caused by dental plaque. Several antiplaque and anti-microbial agents have been successfully incorporated into toothpastes and mouthwashes to control plaque biofilms and to prevent and treat gingivitis and periodontitis. The aim of this article was to review recent developments in the antiplaque, anti-gingivitis, and anti-periodontitis properties of some common compounds in toothpastes and mouthwashes by evaluating basic and clinical studies, especially the ones published in the past five years. Read More

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Preparation, characterization and dyeing wastewater treatment of a new PVDF/PMMA five-bore UF membrane with β-cyclodextrin and additive combinations.

Water Sci Technol 2021 Apr;83(8):1847-1862

Donghua University, Shanghai 200051, China.

A new type of polyvinylidene fluoride (PVDF)/polymethyl methacrylate (PMMA) hollow fiber membrane (HFM) with five bores was prepared. The effects of polyvinylpyrrolidone (PVP), β-cyclodextrine (β-CD), polyethylene glycol (PEG) and polysorbate 80 (Tween 80) and their combinations on the PVDF/PMMA five-bore HFMs were investigated. The performance and fouling characteristics of five-bore HFMs for dyeing wastewater treatment were evaluated. Read More

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Circular RNA hsa_circ_0000117 accelerates the proliferation and invasion of gastric cancer cells by regulating the microRNA-337-3p/signal transducer and activator of transcription 3 axis.

Bioengineered 2021 Dec;12(1):1381-1390

Department of Anesthesia, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.

Circular RNA hsa_circ_0000117 is reportedly increased in Gastric cancer (GC), however, its role is unexplored. Hsa_circ_0000117 expression and function in GC was investigated using standard cell phenotypic and expression assays. Pull-down and luciferase reporter assays also elucidated hsa_circ_0000117 mechanisms. Read More

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December 2021

Metal-Free Multilayer Hybrid PENG Based on Soft Electrospun/-Sprayed Membranes with Cardanol Additive for Harvesting Energy from Surgical Face Masks.

ACS Appl Mater Interfaces 2021 May 25;13(17):20606-20621. Epub 2021 Apr 25.

Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia, 73010 Arnesano (Lecce), Italy.

Disposable surgical face masks are usually used by medical/nurse staff but the current Covid-19 pandemic has caused their massive use by many people. Being worn closely attached to the people's face, they are continuously subjected to routine movements, i.e. Read More

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Impact of Fluoridated and Non-fluoridated Mouth Rinses on Frictional Resistance between Orthodontic Archwire and Bracket: A Comparative Study.

J Contemp Dent Pract 2020 Dec 1;21(12):1337-1341. Epub 2020 Dec 1.

Department of Conservative Dentistry and Endodontics, RKDF Dental College and Research Center, Bhopal, Madhya Pradesh, India.

Aim And Objective: The present study aimed to assess the effect of fluoridated and nonfluoridated mouth ri nses on resistance to friction between orthodontic bracket and archwire.

Materials And Methods: This study comprises 60 premolar stainless steel (SS) brackets with 0.022 inches slot size. Read More

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December 2020

Rapid collagen-directed mineralization of calcium fluoride nanocrystals with periodically patterned nanostructures.

Nanoscale 2021 May 23;13(17):8293-8303. Epub 2021 Apr 23.

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road No. 122, Wuhan, 430070, China.

Collagen fibrils present periodic structures, which provide space for intrafibrillar growth of oriented hydroxyapatite nanocrystals in bone and contribute to the good mechanical properties of bone. However, there are not many reports focused on bioprocess-inspired synthesis of non-native inorganic materials inside collagen fibrils and detailed forming processes of crystals inside collagen fibrils remain poorly understood. Herein, the rapid intrafibrillar mineralization of calcium fluoride nanocrystals with a periodically patterned nanostructure is demonstrated. Read More

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Enhanced biosorption of fluoride by extracted nanocellulose/polyvinyl alcohol composite in batch and fixed-bed system: ANN analysis and numerical modeling.

Environ Sci Pollut Res Int 2021 Apr 22. Epub 2021 Apr 22.

Department of Chemical Engineering, Jadavpur University, Kolkata, India.

The present investigation attempted to examine the defluoridation feasibility onto the extracted nanocellulose/PVA polymer composites. Nanocellulose were derived from sugarcane bagasse and blended with PVA (polyvinyl alcohol) polymer matrix. The defluoridation potential of nanocellulose/PVA was observed to be significantly dependent on the various operational factors including pH, time interval, etc. Read More

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Design, synthesis, and evaluation of positron emission tomography/fluorescence dual imaging probes for targeting facilitated glucose transporter 1 (GLUT1).

Org Biomol Chem 2021 Apr 24;19(14):3241-3254. Epub 2021 Mar 24.

Department of Chemistry, 11227 Saskatchewan Drive University of Alberta, Edmonton, AB, Canada T6G 2G2.

Increased energy metabolism followed by enhanced glucose consumption is a hallmark of cancer. Most cancer cells show overexpression of facilitated hexose transporter GLUT1, including breast cancer. GLUT1 is the main transporter for 2-deoxy-2-[F]fluoro-d-glucose (2-[F]FDG), the gold standard of positron emission tomography (PET) imaging in oncology. Read More

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Fluorine-Containing Triazole-Decorated Silver(I)-Based Cationic Metal-Organic Framework for Separating Organic Dyes and Removing Oxoanions from Water.

Inorg Chem 2021 Apr 22. Epub 2021 Apr 22.

School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

Four new triazole-decorated silver(I)-based cationic metal-organic frameworks (MOFs), {[Ag(L1)](BF)} (), {[Ag(L1)](NO)} (), {[Ag(L2)](BF)} (), and {[Ag(L2)](NO)} (), have been synthesized using two newly designed ligands, 3-fluoro-5-(4-1,2,4-triazol-4-yl)pyridine (L1) and 3-(4-1,2,4-triazol-4-yl)-5-(trifluoromethyl)pyridine (L2). When the fluorine atom was changed to a trifluoromethyl group at the same position, tremendous enhancement in the MOF dimensionality was achieved [two-dimensional to three-dimensional (3D)]. However, changing the metal salt (used for the synthesis) had no effect. Read More

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