Abstract. Raman scattering from a high purity calcium fluoride crystal excited by a 6328 Å He-Ne laser has been observed. Contrary to results reported by Russell, no Raman structure was observed except for the first order line at 322 cm -1.The strong spectrum, reported by Russell as second order Raman scattering, is found to closely resemble the …

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 ...

Abstract Collagen fibrils present periodic structures, which provide space for intrafibrillar growth of oriented hydroxyapatite nanocrystals in bone and contribute to the good mechanical properties of bone. ... Mineralized tendons with organized calcium fluoride nanocrystals acquire mechanical properties (indentation elastic modulus ∼25.1 GPa ...

Herein, the size- and shape-controlled synthesis of nearly-monodisperse, lanthanide-doped calcium fluoride (CaF 2) nanocrystals (NCs) is reported.The sizes and shapes of CaF 2 NCs are controlled by tailoring the reaction conditions, such as the concentration of lithium fluoride precursors, reaction time and temperature, and the …

For the formation of solid calcium fluoride the source of calcium may be either the enamel itself or remaining saliva or--in plaque--plaque fluid and calculus. The aim of the present study was to examine whether saliva through its calcium content has any influence on the amount of calcium fluoride formed by a topical fluoride treatment of enamel.

Here, a 3D thermal conductivity network has been successfully constructed inside the PI matrix by the combination of ionic liquids (IL) and calcium ... [Show full abstract] fluoride (CaF 2 ...

Calcium Fluoride - Science topic. Calcium fluoride. Occurring in nature as the mineral fluorite or fluorspar. It is the primary source of fluorine and its compounds. Pure calcium...

Abstract. This study utilized a fluidized bed reactor (FBR) for fluoride removal from high-concentration fluoride-ion-containing simulated semiconductor …

In order to study how L-type VDCC modulate calcium ion (Ca(2+)) homeostasis and the expression of osteogenic transcription factors in OBs exposed to fluoride, MC3T3-E1 cells were exposed to a gradient of concentrations of fluoride (0, 2.0, 5.0, 10.0 mg/L) in combination with 10 μM nifedipine, a specific inhibitor of VDCC, for 48 h.

The refractive indices of synthetic calcium fluoride for 69 wavelengths from 138 nm in the deep ultraviolet to 2326 nm in the near infrared were measured by the minimum-deviation method in a nitrogen environment. We made these measurements at 20° and 25 °C, respectively, to determine the thermal coefficients of the refractive index over this wide …

Two-Photon Absorption Spectroscopy of the Trivalent Cerium Ion in Calcium-Fluoride. The two-photon transitions from the lowest 4f to the 5d states of the C (,4v) center in Ce ('3+):CaF (,2) from 31 900 to 50 500 cm ('-1) have been studied with a tunable dye laser as a function of laser wavelength, intensity, polarization and focusing geometry.

Abstract Crystallization process in a fluidized bed reactor (FBR) has been regarded as an environmentally friendly technology for the removal and recovery of fluoride from industrial wastewater. ... Then, a growth model was used to predict the linear growth rate of calcium fluoride at a high influent concentration of fluoride. The pressure ...

Abstract We discuss the intrinsic birefringence of calcium fluoride and othercrystalline materials that may be used in the optics for 193nm and 157nmlithography, including the characterization of the effect and itsimplications for performance of lens systems at these wavelengths. Wediscuss and assess the approaches by the lithography …

Abstract: A process is disclosed for producing calcium fluoride. The process comprises (a) mixing phosphate rock with aqueous H 2 SiF 6 at ambient temperature for at least one hour; (b) nucleating the calcium fluoride in the slurry prepared in step (a) by reacting the slurry at a temperature and for a time sufficient to initiate and sustain ...

Zinc-Calcium-Fluoride Bioglass-Based Innovative Multifunctional Dental Adhesive with Thick Adhesive Resin Film Thickness ACS Appl Mater Interfaces. 2020 Jul 8;12 (27):30120 ... Abstract Apart from producing high bond strength to tooth enamel and dentin, a dental adhesive with biotherapeutic potential is clinically desirable, aiming to …

The calcium fluoride can be recognized as a basic product in solving the problem of the waste catalyst hydrofluoric acid utilization. In the article, the features of …

Calcium fluoride single crystals for ultra violet applicatio ns have been finished to flat by the float polishing. process with 7nm-diameter silicon dioxide powder, pure water and a tin lap. The ...

Abstract. Crystallization process in a fluidized bed reactor (FBR) has been regarded as an environmentally friendly technology for the removal and recovery of fluoride from industrial wastewater ...

The novel calcium phosphate and fluoride nanocomposites could be rendered antibacterial with CHX to greatly reduce biofilm formation, acid production, CFU and metabolic activity. ... Abstract Objectives: Previous studies have developed calcium phosphate and fluoride releasing composites. Other studies have incorporated …

Abstract. The calcium-based substrate, plants and microorganisms and their interactions in constructed wetlands (CWs) could affect the removal performance and transformation of fluoride (F ...

Abstract. Bone is the main target of fluorosis, and it has been perfectly elaborated that a moderate dosage of calcium (Ca) can alleviate bone fluorosis. However, whether Ca can alleviate fluorosis through the phosphatidylinositol 3 kinase (PI3K)/protein kinase B (AKT) signaling pathway has not yet been reported.

Objective: To measure in vitro wear of calcium, fluoride and phosphate releasing restorative material compared to two resins composites and a glass ionomer. Methods: Methods: 15mm diameter x 3mm thick discs of each material (n=8) were prepared in a split mold and light cured (output 560mW/cm²) following each manufacturer's directions.

Excessive fluoride mainly causes skeletal lesions. Recently, it has been reported that an appropriate level of calcium can alleviate fluorosis. However, the appropriate concentration and mechanism of calcium addition is unclear. Hence, we evaluated the histopathology and ultrastructure, DNA fragment …

Abstract. 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: …

Researchers at Nikon have reported that their ArF grade calcium fluoride windows survive up to 20 J cm −2 in 20 ns pulses without bulk damage [28]. High damage threshold (29.8 J cm −2 ...

Abstract. All currently used topical fluoride agents deposit soluble fluoride as calcium fluoride on enamel or in lesions. Calcium fluoride serves as a source of fluoride for the …

Calcium fluoride is one of the favourite optical materials in the advanced optics applications owing to its superior optical transmission and mechanical properties. ... [Show full abstract ...

Abstract. The present reports a new process for recovering high purity calcium fluoride from wastewater. A column reactor system with calcium sulfate dihydrate as reaction medium was used. It was ...

Abstract. New multifunctional nanoparticles (NPs) that can be used as contrast agents (CA) in different imaging techniques, such as photoluminescence (PL) …