نتایج جستجو برای: fluorides nanocrystals

تعداد نتایج: 12604  

Journal: :ACS applied nano materials 2023

Nanostructured metal fluorides (nanofluorides) are an emerging type of inorganic nanocrystals (NCs) with unique physiochemical properties for advanced applications. One recent demonstration used water-dispersed ultrasmall CaF2 nanofluorides as imaging agents that combined the advantages NCs benefit background-free 19F-magnetic resonance (19F-MRI). Nevertheless, obtaining small a face-centered c...

Journal: :Occupational and environmental medicine 1997
K Lund J Ekstrand J Boe P Søstrand J Kongerud

OBJECTIVES To study the absorption of inhaled hydrogen fluoride (HF) by measuring plasma fluorides and HF concentrations in the breathing zone during exposure to HF. A possible dose-effect relation was investigated by following airway symptoms and lung function-that is, forced expiratory volume in one second (FEV1) and forced vital capacity (FVC)-during and after exposure to HF. METHODS 20 he...

Journal: :Dalton transactions 2015
Erhard Kemnitz Johannes Noack

This review article focuses on the mechanism of the non-aqueous fluorolytic sol gel-synthesis of nanoscopic metal fluorides and hydroxide fluorides. Based on MAS-NMR, XRD, WAXS and SAXS investigations in combination with computational calculations, it is shown that a stepwise replacement of alkoxide by F-ions takes place resulting in the formation of a large variety of metal alkoxide fluoride c...

Journal: :Journal of the American Chemical Society 1926

Journal: Nanochemistry Research 2017

Magnetic-fluorescent lanthanide doped sodium lutetium fluoride (NaLuF4:Yb3+/Er3+/Gd3+) nanocrystals were synthesized via facile hydrothermal method by varying concentration of Gd3+. Powder X-ray powder diffraction (PXRD), scanning electron microscopy (SEM),transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), p...

2003

Fluorides, hydrogen fluoride, and fluorine have been identified in at least 188 of the 1,636 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL) (HazDat 2003). However, the number of sites evaluated for fluorides, hydrogen fluoride, and fluorine is not known. The frequency of these sites can be seen in Figure 6-1. Of these sites, all are located...

Journal: :Chemical communications 2014
Cong-Min Fan Michelle D Regulacio Chen Ye Suo Hon Lim Yuangang Zheng Qing-Hua Xu An-Wu Xu Ming-Yong Han

AgGaS2 (AGS) nanocrystals that exist in the orthorhombic phase were successfully prepared for the first time through a one-pot colloidal synthetic strategy using suitable coordinating solvents. These orthorhombic AGS nanocrystals were found to display great potential in visible-light-driven photocatalysis.

2014
Sarah Yunmi Lee Stefan Neufeind Gregory C. Fu

The catalytic asymmetric synthesis of alkyl fluorides, particularly α-fluorocarbonyl compounds, has been the focus of substantial effort in recent years. While significant progress has been described in the formation of enantioenriched secondary alkyl fluorides, advances in the generation of tertiary alkyl fluorides have been more limited. Here, we describe a method for the catalytic asymmetric...

Journal: :The Journal of biological chemistry 1988
S G Withers K Rupitz I P Street

Mechanism-based glycosidase inhibitors are of considerable use in studies of enzyme mechanism, in studies of glycoprotein processing, and possibly therapeutically in control of sugar uptake. This paper describes a new general approach to mechanism-based inactivation of glycosidases which involves trapping a covalent glycosyl enzyme intermediate. This is achieved by use of 2-deoxy-2-fluoro-D-gly...

Journal: :iranian journal of science and technology (sciences) 2014
n. m. ganesan

titanium dioxide nanocrystals were synthesized by sol-gel method at room temperature. titanium isoprophoxide and absolute ethanol were used as precursors to prepare the sol. the ph of the solution was adjusted by adding nitric acid and sodium hydroxide solution. the prepared tio2 nanocrystals were annealed at 325°c, 425°c and 525°c respectively. the effect of ph on the surface morphology and st...

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