Search results for "Structural stabilities"

showing 2 items of 2 documents

High-pressure theoretical and experimental study of HgWO4

2011

HgWO 4 at ambient pressure is characterized using a combination of ab initio calculations, X-ray diffraction and Raman scattering measurements. The effect of low pressure and temperature on the structural stability is analysed. Extending our ab initio study to the range of higher pressures, a sequence of stable phases up to 30GPa is proposed. © 2011 Taylor & Francis.

DiffractionRaman scatteringLow pressuresX ray diffractionAb initioExperimental studiesPressure effectsMolecular physicsStable phasisScatteringCondensed Matter::Materials Sciencesymbols.namesakeAb initio quantum chemistry methodsX raysScatteringChemistryRaman Scattering measurementsTungstatesCondensed Matter PhysicsX-ray diffractionAmbient pressuresAb initio studyStructural stabilityPhase transitionsFISICA APLICADAX-ray crystallographysymbolsStructural stabilitiesTungsten compoundsAb initio calculationsCalculationsDiffractionStabilityRaman scatteringAmbient pressure
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Confined crystallization of a HKUST-1 metal–organic framework within mesostructured silica with enhanced structural resistance towards water

2017

A HKUST-1 metal–organic framework was crystallized in the NH2-modified mesostructured silica FDU-12 in order to improve its structural stability upon water exposure. In-depth structural characterization studies of the designed composite confirmed successful formation of the MOF phase within the ordered spherical mesopores of the silica matrix. In spite of the confinement within the cavities, MOF exhibits full accessibility for the adsorbed gas molecules. In contrast to the bulk HKUST-1, which undergoes slow phase transition in a humid environment, the structural integrity of the HKUST-1 in the humid-protective matrix remains unchanged even after immersion and stirring in water at elevated t…

Phase transitionMaterials scienceRenewable Energy Sustainability and the EnvironmentComposite numberEngineering controlled terms: Crystalline materialsOrganometallicsStability Compendex keywords Confined crystallizationElevated temperatureMesostructured silicaMetal organic frameworkSpherical mesoporesStructural characterizationStructural resistanceStructural stabilities Engineering main heading: SilicaNanotechnology02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical scienceslaw.inventionAdsorptionChemical engineeringlawPhase (matter)MoleculeGeneral Materials ScienceMetal-organic frameworkCrystallization0210 nano-technologyMesoporous material
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