Search results for "Sol–gel"

showing 2 items of 12 documents

centers induced by γ irradiation in sol–gel synthesized oxygen deficient amorphous silicon dioxide

2007

The effects of room temperature γ-ray irradiation up to a dose of ∼1300 kGy are investigated by Electron paramagnetic resonance (EPR) measurements in amorphous silicon dioxide (a-SiO2) produced by a sol-gel synthesis method that introduces O{triple bond, long}Si{single bond}Si{triple bond, long}O oxygen deficiency. We have found that exposure to radiation generates the Eγ′ center with the same spectral features found in high purity commercial a-SiO2. The maximum concentration of defects induced in this sol-gel material indicates that its resistance to radiation is comparable to that of synthetic fused a-SiO2. The concentration of Eγ′ center increases with irradiation, featuring a sublinear …

RadiationOxygen deficientSettore ING-IND/20 - Misure E Strumentazione NucleariChemistrySettore FIS/01 - Fisica SperimentaleSilicaRadiationCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionSilica Radiation Electron spin resonance Sol–gel aerogel and solution chemistry DefectsChemical bondlawAmorphous silicon dioxideElectron spin resonanceMaterials ChemistryCeramics and CompositesPhysical chemistryDefectsIrradiationElectron paramagnetic resonanceSol–gel aerogel and solution chemistrySaturation (magnetic)Sol-gelNuclear chemistryJournal of Non-Crystalline Solids
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Effect of Urea–Hydrogen Peroxide Content on the Photocatalytic Activity of Zinc Oxide Nanoparticles

2021

ZnO nanoparticles (NPs) were synthesized using zinc acetate dihydrate, ethanol, and oxalic acid as precursor, solvent, and complexing agent, respectively, and urea–hydrogen peroxide (UHP) as, simultaneously, nitrogen precursor and oxygen donor. The structural, morphological, textural, and optical properties of ZnO photocatalysts were investigated using different characterization methods such as XRD, SEM, BET, and UV-Vis-DRS. The XRD patterns showed that the products consisted of ZnO and revealed the presence of nitrogen. SEM images revealed the agglomeration and aggregation of NPs. The photocatalytic activity of ZnO samples was estimated based on the photo-oxidation of 2-propanol under UV i…

UHPgas-solid regime2-propanolSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhotocatalysisSol–geloxygen vacancies
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