Search results for "Highly strained"

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Thermally Induced Structural Modification of Silica Nanoparticles Investigated by Raman and Infrared Absorption Spectroscopies

2010

We report an experimental investigation by Raman and infrared (IR) absorption spectroscopies on the structural modifications induced by isochronal thermal treatments on amorphous SiO2 nanoparticles (fumed silica). In particular, three different commercial types of this material, characterized by particle mean diameters of 7, 14, and 40 nm, were subjected to thermal treatments from 100 up to 1000 °C. We found that some properties of fumed silica, such as the SiOSi mean bond angle, ring size distribution, and surface adsorbed water content, are drastically different from those of common bulk silica materials and intimately related to the particles' dimension. The SiOSi mean bond angle, probed…

Core shellSintering effectAnalytical chemistryDehydroxylationSilica nanoparticleSurface shellThermal treatmentTypical valueNanoparticleSinteringFumed silicaThermal treatmentThree-membered ringeducation.field_of_studyWater contentAdsorbed waterRaman lineAtomic networkSilicaThermally inducedSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSurfaceGeneral EnergysymbolsNetwork structureAbsorption (chemistry)IR measurementMaterials scienceAbsorption spectroscopyStrained structurePopulationInfrared imagingInfrared spectroscopyAbsorptionsymbols.namesakeAdsorptionAbsorption spectroscopyHighly strainedShells (structures)Physical and Theoretical ChemistryeducationFumed silicaNano silica Raman proprieta' strutturaliExperimental investigationParticle mean diameterBond angleStructural modificationSilica materialRaman spectroscopy
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