This study evaluated the effect of different types of filler in a resin-based pit and fissure sealant on fluoride release, recharge, and lactic acid neutralization. Resin-based sealant was incorporated with 5% w/w of the following fillers: calcium aluminate cement (CAC), synthesized mesoporous silica (SI), a CAC and SI mixture (CAC+SI), glass-ionomer powder (GIC), and acetic acid-treated GIC (G...

background: introducing new endodontic cements should await comprehensive investigations and new formulations have to be tested in vivo before applying in human beings. so, the purpose of this study was to compare the biocompatibility of new endodontic cements, calcium aluminate α-aluminate cement (caac), calcium aluminate α-aluminate plus cement (caac plus), and a mixture of wollastonite and c...

The effects of lithium doping on the sintering and grain growth of non-stoichiometric nano-sized magnesium aluminate spinel were studied using a spark plasma sintering (SPS) apparatus. Li-doped nano-MgO·nAl₂O₃ spinel (n = 1.06 and 1.21) powders containing 0, 0.20, 0.50 or 1.00 at. % Li were synthesized by the solution combustion method and dense specimens were processed using a SPS apparatus at...

In this work the reagent purification of aqueous solutions from sulfates with use red sludge Nikolaev alumina plant processes were investigated. This sludge, according to chemical analysis, contains a sufficiently large amount (up 18 %) and calcium oxide 10 along silicate iron oxides sodium aluminates. The ability aluminate be deposited solution in form sulfoaluminates was used purify water sul...

The aim of this work was to comprehensively study the effect variable atomic composition and structural-phase state Cox(MgF2)100-x nanocomposites on their nonlinear transport magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers glass substrates were obtained by means ion-beam sputtering a composite target in argon atmosphere wide range compositions (x = 16–59 at.%). Using ...

To enhance the frictional wear performance of AZ31B magnesium alloy, a nanocrystalline layer was prepared by ultrasonic impact (UI) treatment on alloy samples, and effects different times (5 min, 10 15 min) organization resistance composite coating were studied. The findings revealed that maximum thickness about 50 μm after min time, which approximately higher than MAO coating. elemental compos...

We report transmission electron microscope observations that provide evidence of deformation twinning in plastically deformed nanocrystalline aluminum. The presence of these twins is directly related to the nanocrystalline structure, because they are not observed in coarse-grained pure aluminum. We propose a dislocation-based model to explain the preference for deformation twins and stacking fa...

Silicon nitride nanocrystals (NCs) have been prepared via in situ nitridation of magnesium followed by a metathesis reaction with sol-gel derived silica particles. Highly luminescent, freestanding β-Si(3)N(4) NCs with complex surface chemistry dominated by Si-H and N-H moieties were isolated upon etching with hydrofluoric acid.