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https://www.readbyqxmd.com/read/28636233/green-synthesis-of-small-nanoparticles-of-a2sif6-a-li-cs-using-ionic-liquids-as-solvent-and-fluorine-source-a-novel-simple-approach-without-hf
#1
Jacob Olchowka, Markus Suta, Claudia Wickleder
In this communication, nanoparticles of the fluoridosilicates A2SiF6 (A= Li, Na, K, Rb, Cs), which are extremely promising host lattices for future LEDs, are presented for the first time. The preparation method we introduces here is a very simple and energy and time saving one, moreover the usage of toxic HF or elemental fluorine is avoided. In detail, the ionic liquid [Bmim]PF6 was used both as solvent and fluoride source in an ionothermally assisted microwave synthesis. The small size of the so obtained nanoparticles is of huge relevance for their applications as thin films or coverage of surfaces for, e...
June 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28635416/arsenic-and-fluoride-co-contamination-in-shallow-aquifers-from-agricultural-suburbs-and-an-industrial-area-of-punjab-pakistan-spatial-trends-sources-and-human-health-implications
#2
Abida Farooqi, Jawairia Sultana, Noshin Masood
Release of arsenic (As) and fluoride (F(-)) species into groundwater is a serious health concern around the world. The present study was the first systematic baseline study conducted in Rahim Yar Khan district, Punjab, focusing on As and F(-) contamination in groundwater. A total of 51 representative groundwater samples comprising of 44 samples from agricultural suburbs and 7 from an industrial base were analysed. Statistical parameters, principal component analysis-multiple linear regression (PCA-MLR) and health risk assessment model were used to investigate the hydro geochemistry, spatial patterns, interrelation, source contribution and associated health risks of high As and F(-) in groundwater of the study area...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28634794/evaluation-in-situ-of-genotoxicity-and-stress-in-south-american-common-toad-rhinella-arenarum-in-environments-related-to-fluorite-mine
#3
Favio E Pollo, Pablo R Grenat, Zulma A Salinas, Manuel A Otero, Nancy E Salas, Adolfo L Martino
Little attention has been paid to the impact of wastewater generated by mining activities on fluoride. In this study, we evaluated the hematology responses of common South American toad Rhinella arenarum inhabiting natural and artificial environments associated with a fluorite mine from central Argentina. We analyzed three sampling stations associated with the fluorite mine: (I) Los Cerros Negros stream (CN), which runs on granitic rock with a high fluorite content; (II) Los Vallecitos stream (LV), which runs on metamorphic rock with low fluorite content; and (III) artificial decantation ponds (DP) containing sediments produced by fluorite flotation process...
June 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634633/erratum-to-nd-yag-laser-irradiation-associated-with-fluoridated-gels-containing-photo-absorbers-in-the-prevention-of-enamel-erosion
#4
L G S Pereira, S H Joao-Souza, S J C Bezerra, A B Borges, A C C Aranha, T Scaramucci
No abstract text is available yet for this article.
June 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28634492/effectiveness-of-different-preventive-programs-in-cariogram-parameters-of-young-adults-at-high-caries-risk
#5
Said Karabekiroğlu, Nimet Ünlü
OBJECTIVE: To evaluate the effectiveness of different preventive programs in young adults at high caries risk using Cariogram software. METHODS: Sixty-six young adults with high caries risk were evaluated. Dental caries risk for all subjects was determined according to WHO criteria. Subjects were divided into three different preventive groups (control: OH, fluoride varnish: FV, and chlorhexidine varnish: CV). They were followed for 12 weeks (baseline: T0, 1 week: T1, 4 weeks: T2, and 12 weeks: T3)...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28632388/accelerating-dynamics-of-h-on-graphene-by-coadsorbates
#6
Manh-Thuong Nguyen, Phong Nam Pham
There are several factors that affect the dynamics of adsorbed hydrogen atoms on a carbon surface, here, using density-functional calculations we show that coadsorption can be a highly influential factor. The diffusion of hydrogen adsorbed on graphene is explored in the presence of H-containing molecules. Without coadsorbates the diffusion barrier of H on graphene is 0.94 eV while with water/ammonia it is 0.85/0.12 eV. The low barrier in the case of ammonia is attributed to the formation of a stable intermediate state NH$_4$ while such a stable state is not found in the case of water...
June 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28632273/a-model-for-c-f-activation-by-electrophilic-phosphonium-cations
#7
Ian Mallov, Timothy C Johnstone, Darcy C Burns, Douglas W Stephan
The synthesis of the electrophilic phosphonium cation (EPC) salt [C10H6(CF3)PF(C6F5)2][B(C6F5)4] 4 was achieved via oxidation of phosphine [C10H6(CF3)P(C6F5)2] 2 with XeF2 to form phosphorane [C10H6(CF3)PF2(C6F5)2] 3 and subsequent fluoride ion abstraction. Structural and spectroscopic characterization of 4 provides evidence of an interaction between the CF3 functionality and the phosphonium centre. AIM and NBO analyses also support donation from a lone pair on a fluorine atom of the CF3 group to the P-F σ* orbital of the fluorophosphonium unit, consistent with previously proposed mechanisms for main group C-F bond activations...
June 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631468/pyrene-tagged-ionic-liquids-separable-organic-catalysts-for-sn2-fluorination
#8
Abu Taher, Kyo Chul Lee, Hye Ji Han, Dong Wook Kim
We prepared pyrene-substituted imidazolium-based ionic liquids (PILs) as organic catalysts for the SN2 fluorination using alkali metal fluoride (MF). In this system, the PIL significantly enhanced the reactivity of MF due to the phase-transfer catalytic effect of the imidazolium moiety as well as the metal cation-π (pyrene) interactions. Furthermore, this homogeneous catalyst PIL was easily separated from the reaction mixture using reduced graphene oxide by π-π stacking with the pyrene of PIL.
June 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28631132/adaptive-biochemical-and-physiological-responses-of-eriobotrya-japonica-to-fluoride-air-pollution
#9
Nada Elloumi, Mohamed Zouari, Imed Mezghani, Ferjani Ben Abdallah, Steve Woodward, Monem Kallel
The biochemical and physiological effects of fluoride were investigated in loquat trees (Eriobotrya japonica) grown in the vicinity of a phosphate fertilizer plant in Tunisia. Photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (E), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) activities were assessed; along with photosynthetic pigments, lipid peroxidation, electrolytic leakage (EL) and total phenolic contents in foliage and roots of trees at different distances from the phosphate fertilizer plant...
June 19, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28629707/theoretical-investigation-of-the-selective-dehydration-and-dehydrogenation-of-ethanol-catalyzed-by-small-molecules
#10
Yanqun Wang, Yizhen Tang, Youxiang Shao
Catalytic dehydration and dehydrogenation reactions of ethanol have been investigated systematically using the ab initio quantum chemistry methods The catalysts include water, hydrogen peroxide, formic acid, phosphoric acid, hydrogen fluoride, ammonia, and ethanol itself. Moreover, a few clusters of water and ethanol were considered to simulate the catalytic mechanisms in supercritical water and supercritical ethanol. The barriers for both dehydration and dehydrogenation can be reduced significantly in the presence of the catalysts...
May 17, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28629602/management-of-dentin-hypersensitivity-by-practitioners-in-the-national-dental-practice-based-research-network
#11
Dorota T Kopycka-Kedzierawski, Cyril Meyerowitz, Mark S Litaker, Marc W Heft, Nirmala Tasgaonkar, Marianne R Day, Andretta Porter-Williams, Valeria V Gordan, Robin L Yardic, Timothy M Lawhorn, Gregg H Gilbert
BACKGROUND: Dentin hypersensitivity (DH) is a condition commonly encountered in clinical dental practice. The authors conduct a study to identify the treatments recommended to manage DH among dentists in the United States. METHODS: The authors conducted a multicenter study of 1,862 patients with DH who received a diagnosis and were treated by 171 dentists with the National Dental Practice-Based Research Network. RESULTS: The most common treatment recommended was desensitizing over-the-counter (OTC) potassium nitrate toothpaste (alone or in combination with other treatments) for 924 of 1,862 patients (50%)...
June 16, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28629008/multi-walled-carbon-nanotubes-graphene-oxide-hybrid-and-nanohydroxyapatite-composite-a-novel-coating-to-prevent-dentin-erosion
#12
Sídnei Nahorny, Hudson Zanin, Vinie Abreu Christino, Fernanda Roberta Marciano, Anderson Oliveira Lobo, Luís Eduardo Silva Soares
To date is emergent the development of novel coatings to protect erosion, especially to preventive dentistry and restorative dentistry. Here, for the first time we report the effectiveness of multi-walled carbon nanotube/graphene oxide hybrid carbon-base material (MWCNTO-GO) combined with nanohydroxyapatite (nHAp) as a protective coating for dentin erosion. Fourier transform Raman spectroscopy (FT-Raman), scanning electron (SEM), and transmission electron (TEM) microscopy were used to investigated the coatings and the effect of acidulated phosphate fluoride gel (APF) treatment on bovine teeth root dentin before and after erosion...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628586/building-a-pediatric-oral-health-training-curriculum-for-community-health-workers
#13
Molly Martin, William Frese, Christie Lumsden, Anna Sandoval
OBJECTIVES: Community health workers (CHWs) are a promising approach to oral health promotion in high-risk populations. This article describes the process of creating a pediatric oral health CHW training curriculum. DESIGN: Existing curricula were identified through outreach efforts to experts in the oral health and CHW fields, as well as PubMed and Google searches. After coding basic information, curricula were mapped to define oral health domains. Then group discussion was employed to determine final curriculum contents...
June 16, 2017: Journal of Public Health Management and Practice: JPHMP
https://www.readbyqxmd.com/read/28628204/a-high-throughput-process-for-the-solid-phase-purification-of-synthetic-dna-sequences
#14
Andrzej Grajkowski, Jacek Cieślak, Serge L Beaucage
An efficient process for the purification of synthetic phosphorothioate and native DNA sequences is presented. The process is based on the use of an aminopropylated silica gel support functionalized with aminooxyalkyl functions to enable capture of DNA sequences through an oximation reaction with the keto function of a linker conjugated to the 5'-terminus of DNA sequences. Deoxyribonucleoside phosphoramidites carrying this linker, as a 5'-hydroxyl protecting group, have been synthesized for incorporation into DNA sequences during the last coupling step of a standard solid-phase synthesis protocol executed on a controlled pore glass (CPG) support...
June 19, 2017: Current Protocols in Nucleic Acid Chemistry
https://www.readbyqxmd.com/read/28626624/biocompatibility-and-in-vivo-operation-of-implantable-mesoporous-pvdf-based-nanogenerators
#15
Yanhao Yu, Haiyan Sun, Hakan Orbay, Feng Chen, Christopher G England, Weibo Cai, Xudong Wang
The rapid developments of implantable biomedical electronics give rise to the motivation of exploring efficient and durable self-powered charging system. In this paper, we report a mesoporous polyvinylidene fluoride (PVDF)-based implantable piezoelectric nanogenerator (NG) for in vivo biomechanical energy harvesting. The NG was built with a sponge-like mesoporous PVDF film and encapsulated by polydimethylsiloxane (PDMS). After embedding this NG into rodents, a Voc of ~200 mV was produced from the gentle movement of rodent muscle...
September 2016: Nano Energy
https://www.readbyqxmd.com/read/28626286/synergistic-effect-of-fluoride-and-laser-irradiation-for-the-inhibition-of-the-demineralization-of-dental-enamel
#16
Raymond Lee, Kenneth H Chan, Jamison Jew, Jacob C Simon, Daniel Fried
Both laser irradiation and fluoride treatment alone are known to provide increased resistance to acid dissolution. CO2 lasers tuned to a wavelength of 9.3 μm can be used to efficiently convert the carbonated hydroxyapatite of enamel to a much more acid resistant purer phase hydroxyapatite (HAP). Further studies have shown that fluoride application to HAP yields fluoroapatite (FAP) which is even more resistant against acid dissolution. Previous studies show that CO2 lasers and fluoride treatments interact synergistically to provide significantly higher protection than either method alone, but the mechanism of interaction has not been elucidated...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28622605/flexible-nanofilms-coated-with-aligned-piezoelectric-microfibers-preserve-the-contractility-of-cardiomyocytes
#17
P José Gouveia, S Rosa, L Ricotti, B Abecasis, H V Almeida, L Monteiro, J Nunes, F Sofia Carvalho, M Serra, S Luchkin, A Leonidovitch Kholkin, P Marques Alves, P Jorge Oliveira, R Carvalho, A Menciassi, R Pires das Neves, L Silva Ferreira
The use of engineered cardiac tissue for high-throughput drug screening/toxicology assessment remains largely unexplored. Here we propose a scaffold that mimics aspects of cardiac extracellular matrix while preserving the contractility of cardiomyocytes. The scaffold is based on a poly(caprolactone) (PCL) nanofilm with magnetic properties (MNF, standing for magnetic nanofilm) coated with a layer of piezoelectric (PIEZO) microfibers of poly(vinylidene fluoride-trifluoroethylene) (MNF+PIEZO). The nanofilm creates a flexible support for cell contraction and the aligned PIEZO microfibers deposited on top of the nanofilm creates conditions for cell alignment and electrical stimulation of the seeded cells...
September 2017: Biomaterials
https://www.readbyqxmd.com/read/28621540/accurate-prediction-of-the-hydration-free-energies-of-20-salts-through-adaptive-force-matching-and-the-proper-comparison-with-experimental-references
#18
Jicun Li, Feng Wang
Simple pair-wise potentials for five alkali ions and four halide ions were developed by only fitting to ab initio MP2 forces with the adaptive force matching (AFM) method. Without fitting to any experimental information, the AFM models predict the hydration free energies of all 10 fluoride and chloride salts formed by these ions within 1.5% of experimental reference. The predicted hydration free energies for the 10 bromide and iodide salts are within 5-6% of experimental references with the larger error likely due to the neglect of explicit treatment of polarization and charge transfer...
June 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28621268/assessment-of-oral-hygiene-knowledge-practices-and-concepts-of-tobacco-usage-among-engineering-students-in-bhubaneswar-odisha-india
#19
Alokenath Bandyopadhyay, Lipsa Bhuyan, Abikshyeet Panda, Kailash C Dash, Malvika Raghuvanshi, Shyam S Behura
AIM: This study aimed to assess oral hygiene-related knowledge and practices among engineering students of Bhubaneswar city and also to evaluate the concepts about the side effects of tobacco usage among those students. MATERIALS AND METHODS: The study was conducted using a self-administered, close-ended questionnaire to assess the oral hygiene knowledge and practices and study the concepts on tobacco usage among 362 engineering students of Bhubaneswar city, Odisha, India...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28618145/novel-solid-state-lithium-conductors-for-lithium-metal-batteries-based-on-electrospun-nanofibers-and-plastic-crystal-composites
#20
Yundong Zhou, Xiaoen Wang, Haijin Zhu, Masahiro Yoshizawa-Fujita, Yukari Miyachi, Michel Armand, Maria Forsyth, George W Greene, Jennifer M Pringle, Patrick Howlett
Organic ionic plastic crystals (OIPCs) are a class of solid-state electrolyte with good thermal stability, non-flammability, non-volatility and good electrochemical stability. When prepared in a composite with electrospun polyvinylidene fluoride (PVdF) nanofibers, a 1:1 mixture of the OIPC N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide and LiFSI produced a free-standing, robust solid state electrolyte. These high concentration Li-containing electrolyte membranes had a transference number of 0.37 (± 0...
June 15, 2017: ChemSusChem
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