OBJECTIVE The time of contact between the product and enamel surface is important in ensuring the efficacy of fluoride varnishes. Thus, some alternatives could avoid fluoride loss to saliva and improve the anticariogenic action of the product. This study evaluated the effect of an experimental coat on the anticariogenic action of fluoride varnishes. MATERIAL AND METHODS Enamel bovine blocks w...

Recent demand on welding fluxes for high-strength low-alloy steel grades has necessitated the development of CaF2-free towards high heat input applications. To meet such requirements, a flux design strategy been postulated by varying MnO/(CaF2 + MnO) mass ratio in CaF2–SiO2–MnO system. The effect MnO substitution CaF2 viscosity and structure investigated, quantitative relationship between struc...

This paper reviews the synthesis, structure and applications of metal fluoride nanoparticles, with particular focus on rare earth (RE) doped fluoride nanoparticles obtained by our research group. Nanoparticles were produced by precipitation methods using the ligand ammonium di-n-octadecyldithiophosphate (ADDP) that allows the growth of shells around a core particle while simultaneously avoiding...

Amplitude-modulation atomic force microscopy (AM-AFM) is used to determine the retention properties of CaF2 nanoparticles adsorbed on mica and on tooth enamel in liquid. From the phase-lag of the forced cantilever oscillation the local energy dissipation at the detachment point of the nanoparticle was determined. This enabled us to compare different as-synthesized CaF2 nanoparticles that vary i...

We introduce a simulation technique suitable to model the tunneling leakage current in the metal(polySi)/CaF2/Si(111) MIS structures using TCAD simulators Minimos-NT and ViennaSHE. The simulations are performed using the real physical parameters of the CaF2/Si tunnel barrier. The results obtained for the case of near-equilibrium carrier transport are in a good agreement with experimental data a...

The CaCl2-CaF2-CaO phase diagram was investigated in the CaO low region (2-CaF2 and CaCl2-CaO binary diagrams, constituting ternary system, were first studied by Differential Scanning Calorimetry (DSC) measurements X-Ray Diffraction (XRD) characterization; a good agreement obtained between models calculated with FactSage® software (FTsalt database) present experimental data. As CaF2-CaO liquidu...

To optimize CaF2 content in highly basic CaO-18%Al2O3-SiO2-10%MgO-CaF2 (%CaO/%SiO2=6, denoted as C/S=6) refining slags used for the production of Al-killed duplex stainless steel with high cleanliness demand, effect on viscosity and ability were studied compared typical CaF2-free CaO-30%Al2O3-SiO2-10%MgO (C/S=6) slag. The addition decreasing slag becomes less obvious increasing temperature cont...

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 fluoridated mouthrinses: a neutral pH solution (Fluordent), an acidulated solution (Fluorgard) and a solution associated with chlorhexidine (Duplak). Twenty-four samples from 6 third sound human molars were divided into two gr...

By combining theoretical modelling with experimental data on CaF2, we studied the interactions responsible for atomic resolution in this system; we discuss the general significance of these results for imaging other insulators. Theoretical modelling was used to calculate the tip–surface interactions in noncontact atomic force microscopy (NC-AFM) imaging of a charged and neutral CaF2 (111) surfa...