Abstract. Background. Chronic exposure to fluoride in drinking water causes an increase in plasma fluoride levels that is related to a reduction …
abstract = "An innovative method for utilizing synthetic calcium fluoride (CaF2), recovered from fluoride-containing semiconductor wastewater, and waste sulfuric acid (H2SO4) to produce hydrofluoric acid (HF) was investigated. The research was set to study the low-temperature production of HF via reaction of synthetic CaF2 and waste H2SO4.
Abstract. The kinetics of growth of calcium fluoride crystals from supersaturated solutions has been investigated using the constant composition method. During the reactions, a fluoride specific ion electrode was used to control the addition of titrants containing calcium and fluoride ions in order to maintain constant supersaturation.
Abstract. CALCIUM fluoride occurs in Nature as the crystal form known as fluorite. It can, however, be grown artificially as single crystals, and when doped with suitable impurities it is widely ...
WO-2005070831-A1 chemical patent summary.
Abstract A model system was used to study the potential improved efficacy of fluoride (F) rinses with a built-in mechanism for continuous calcium (Ca) release. The effects of different Ca addition rates on calcium fluoride (CaF2) formation and deposition were determined.
This dissertation has been microfilmed exactly as received Q 6—645 2 MORALES, Raul, 1935- A STUDY ON THE PRECIPITATION OF CALCIUM AS CALCIUM FLUORIDE. Louisiana State …
Acid resistance zeta potential and ESCA (electron spectroscopy for chemical analysis) experiments were performed on emperador marble and four calcium carbonate samples (onyx calcite, travertine calcite, Iceland spar calcite and aragonite). Six fluorine-containing reagents were used to treat the surfaces of these materials: magnesium hexafluorosilicate, zinc hexafluorosilicate, sodium …
Calcium and fluoride release from excess solid calcium fluoride was monitored for 15-30 min in aqueous solutions containing various concentrations of …
Abstract – The dissolution of two analytical calcium fluoride preparations was studied in aqueous solution. Dissolved calcium fluoride was determined from analysis Ca and F in solution. Original samples of the two preparations and the residue after partial dissolution were studied by X‐ray diffractometry in comparison with natural fluorite.
The relative cariostatic effect of fluoride as fluorapatite, calcium fluoride-like material, loosely bound fluoride or KOH-soluble fluoride is debated. The present study was carried out to investigate this further in an intraoral caries model. Pair of premolars extracted for …
IADR Abstract Archives Calcium Fluoride and Fluorapatite Formation in Fluoride-Calcium-Phosphate Complex Solutions Objectives: Previous studies reported existence of stable solutions that contained high concentrations of fluoride, calcium and phosphate (FCP). The present study investigated the effects of the FCP solution composition on the ...
DOE Contract Number: AC04-94AL85000. Resource Type: Conference. Resource Relation: Conference: Proposed for presentation at the US-Israel Collaboration Discusstions held June 13, 2019 in Albuquerque, NM, United States. Country of Publication:
Calcium fluoride (CaF2) is an insoluble ionic compound composed of Ca 2+ and F − ions. It occurs naturally as the mineral "Fluorite" (also called fluorspar) and as "Blue-John". This salt is the source of most of the world's fluorine. This insoluble solid adopts a cubic structure wherein calcium is coordinated to eight fluoride ...
Abstract The Chinese integrated circuit industry has been transformed from a small state-owned sector into a global competitor, but chip manufacturing produces large amounts of calcium fluoride sludges (CFS). In China, landfill is a current option for treating CFS. In order to solve the problem of unavailable landfill sites and prevent fluorine ...
Abstract: In this paper, a direct co-precipitation method was used to prepare antimony-doped calcium fluoride nanopowders (NPs). The effects of reaction concentration, reaction medium and lanthanum doping on the properties of calcium fluoride NPs were investigated via a control variable method and the best preparation conditions was identified. The structural analysis of the powder materials ...
calcium fluoride ppm crucible less Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Withdrawn Application number EP03018340A Other languages German (de) French (fr) Inventor
Abstract and Figures. The aim of this study was to evaluate, using scanning electron microscopy (SEM), the calcium fluoride uptake by human enamel in situ after topical application using three ...
ABSTRACT. Calcium fluoride is a dielectric material with a wide bandgap (∼12.1 eV) and a relatively high dielectric constant (∼6.8) that forms a van der Waals interface with two-dimensional (2D) materials, meaning that it contains a very low amount of defects. Thin calcium fluoride films can be synthesized using multiple techniques that are ...
Fluoride-Food Component Interactions. The rate and extent of fluoride absorption from the gastrointestinal tract are reduced somewhat by ingestion with solid foods and some liquids, particularly those rich in calcium, such as milk or infant formulas (Spak et al., 1982).Results from studies with rats that had chronically elevated plasma fluoride concentrations showed that a diet high in calcium ...
Calcium fluoride. Occurring in nature as the mineral fluorite or fluorspar. It is the primary source of fluorine and its compounds. Pure calcium fluoride is used as a catalyst in dehydration and dehydrogenation and is used to fluoridate drinking water. (From …
Description of Calcium Fluoride Powder. Designations: Calcium fluoride is a mineral composed of CaF2. It occurs as cubic, isometric crystals and cleavable masses. When pure, it is colorless and transparent, or translucent with a glassy luster. Impurities cause color in the stone, and several varieties exhibit fluorescence.
The invention provides a method for determining calcium fluoride content in fluorite by utilizing complexometric titration and belongs to the technical field of quantitative determination of calcium fluoride. Firstly, the total calcium content is determined, 0.2-0.5 g of a specimen is weighed and is put in a beaker, 20-30 ml of hydrochloric acid and 8-10 ml of a saturated boric acid solution ...
calcium fluoride clay ageing Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number CN 01109444 Other languages Chinese (zh) Other versions CN1186293C (en ...
During the caries process complex reactions involving calcium, phosphate, hydrogen and fluoride ions as main species take place. In this study the precipitation and dissolution reactions occurring in suspensions of enamel, hydroxyapatite (HAP) and fluorapatite (FAP) on addition of fluoride were investigated under well-defined conditions. pH and pF were monitored; calcium and phosphate ...
Calcium Fluoride. The Hospital, 01 May 1909, 46(1187): 188 PMID: 29815316 PMCID: PMC5199887. ... To arrive at the top five similar articles we use a word-weighted algorithm to compare words from the Title and Abstract of each citation. Effects of inorganic orthophosphate and pyrophosphate on dissolution of calcium fluoride in water. ...
The study aimed to synthesize calcium fluoride (CaF2) nanoparticles and compare the push‐out bond strength and viscosity of experimental adhesive (EA) and EA with 5 wt.% CaF2 (CAF‐5%).
Benefits of FluoroCal. Sustained and targeted release fluoride and calcium release for over 24 hours 1 allows fluoride to be delivered over a longer period and deposited on to the tooth. 2. High enamel fluoride uptake can induce fluorapatite, which in turn helps to strengthen the tooth enamel and prevent further sensitivity. 3.
Abstract: This paper aims to develop a cost-effective diamond turning process to obtain nanosmooth CaF 2 optics. Diamond tool wear was also carried out through a number of cutting trials. ... In diamond turning of calcium fluoride abrasive wear was the main tool wear mechanism.
The invention discloses a method for refining calcium fluoride from fluorine-containing sludge, belonging to the technical field of environmental engineering. The method comprises the following steps: 1) screening operation; 2) acidification operation: adding 2-6 times by volume of water or heavy-component-removed clear solution into the screen underflow, sufficiently stirring and controlling ...
Effects of Fluoride and Calcium Phosphate Materials on Remineralization of Mild and Severe White Spot Lesions Biomed Res Int. 2019 Jun 16; 2019 ... Abstract Fixed orthodontic treatments often lead to enamel demineralization and cause white spot lesions (WSLs). The aim of this study was to evaluate the mineralization degree of 2 types of WSLs ...
LATTICE BANDS IN CALCIUM FLUORIDE S.J. FRAY, F.A. J O H N S O N and J.E. QUARRTNGTON Royal Radar Establishment, Malvern, England Abstract--A series of detailed measurements have been made of the absorption of calciumfluorideover the wavelength range 5 to 22 and over the temperature range 20 to 300°K. A number of new absorption bands have been ...