The utilization of dentifrices with low fluorine concentration, for children under 6 years of age, has been suggested to reduce the risks of dental fluorosis. However, in order to have anticariogenic potential, the dentifrice should form loosely-bound fluorine (CaF2) on dental enamel. Considering that the formation of CaF2 is a function inversely related to pH, dentifrices with pH 5.5, with 275...

There is no topically applicable low concentration fluoride delivery device available for caries prevention. This study was aimed to assess the use of a low concentration (1450 ppm) fluoride strip as an effective fluoride delivery system against enamel demineralization. The enamel surface composition and calcium-deficient hydroxyapatite or toothpaste treatments were investigated using X-ray pho...

Nanoparticles are increasingly used in biomedical applications and are especially attractive as biocompatible and biodegradable protein delivery systems. Herein, the interaction between biocompatible 25 nm CaF2 nanoparticles and the ubiquitous calcium sensor calmodulin has been investigated in order to assess the potential of these particles to serve as suitable surface protein carriers. Calmod...

this research was conducted for the purpose of studying the effect of caf2 content in the composition of hotmetal pretreatment flux, based on lime. it was followed in regards to the importance of fluorine amount decrease in hot metal pretreatment and steel making processes. for this purpose, lime based fluxes including 40, 30, 20 and 10 percent calcium fluoride were prepared and hot metal pretr...

This research was conducted for the purpose of studying the effect of CaF2 content in the composition of hot metal pretreatment flux, based on lime. It was followed in regards to the importance of fluorine amount decrease in hot metal pretreatment and steel making processes. For this purpose, lime based fluxes including 40, 30, 20 and 10 percent calcium fluoride were prepared and hot metal pret...

The isolation and partial functional characterization of the two-component response regulator SSK1 gene of Candida albicans was previously reported. Compared to wild-type (CAF2-1) and gene-reconstituted (SSK23) strains, the ssk1 null strain (SSK21) was avirulent in a murine model of hematogenously disseminated candidiasis and less able to adhere to human esophageal cells. More recent data indic...

In order to promote the friction and wear properties of cermet materials, an advanced Ti(C,N) self-lubricating materials with addition ceramic coated nano-sized solid lubricant powders (CaF2@Al2O3) was developed. The were studied by spherical disk matching. Results showed that optimal content CaF2@Al2O3 10 vol%, significantly reduced coefficient cermet. Meanwhile, multilayer core-shell microstr...

The effects of different Ca-addition rates on calcium fluoride (CaF2) precipitation and deposition were investigated in 12 mmol/L sodium fluoride solutions to which 0.1 mol/L calcium chloride solution was continuously added at average rates of (5, 7.5, 10, 12.5, 15 or 20) mmol L(-1) min(-1). The changes in ionic fluoride and calcium concentrations, as well as turbidity, were continuously record...

Abstract. Gibbs energies of formation of CoF2 and MnF 2 have been measured in the temperature range from 700 to l t00 K using Al203-dispersed CaF 2 solid electrolyte and Ni + NiF2 as the reference electrode. The dispersed solid electrolyte has higher conductivity than pure CaF2 thus permitting accurate measurements at lower temperatures. However, to prevent reaction between A120 3 in the solid ...

With tunable dye laser (620-660 nm) excitation, the site-selective upconversion properties of 0.1 mole% Ho3+ doped CaF2, SrF2 and CdF2 monocrystals were studied at 77K. Three distinct luminescence centres (C4,,, C3v and cluster) were identified for both CaF2 and SrF2 crystals, whereas only one cluster centre was detected for CdF2. The upconversion mechanism for the isolated H O ~ + single site ...