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RESEARCH PRODUCT
Silica nanoparticle core structure examined by the E?Si? center 29Si strong hyperfine interaction
Marco CannasFranco Mario GelardiBruno BoizotSimonpietro AgnelloAntonino AlessiGianpiero Buscarinosubject
Materials scienceAnalytical chemistryNanoparticleSilica nanoparticleCeramics and CompositeCondensed Matter PhysicMaterials Chemistry Metals and Alloyslaw.inventionSilica nanoparticleslawMaterials ChemistryIrradiationElectron paramagnetic resonanceHyperfine structureComputingMilieux_MISCELLANEOUSRange (particle radiation)Core-shell modelElectronic Optical and Magnetic MaterialSettore FIS/01 - Fisica Sperimentaleβ-Ray irradiation[CHIM.MATE]Chemical Sciences/Material chemistryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCore (optical fiber)Chemical physicsCeramics and CompositesParticle sizeElectron paramagnetic resonancedescription
Abstract β-Ray irradiation up to 1.2 GGy was employed to induce E′Si γ defects and to study the structure of silica nanoparticles with diameters from 7 up to 20 nm. Defect concentration and their 29 Si strong hyperfine doublet were investigated through electron paramagnetic resonance measurements. Our data indicate that stable defects are located in the nanoparticle core. Furthermore, the E′Si γ hyperfine interaction evidences that the core structure is denser than bulk silica and independent from the particle size. Finally, we put in evidence that the core structure is stable and unaffected by the irradiation in the investigated dose range maintaining the specific features of nanoparticles.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-09-01 |