AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: ELENA-MIRELA PICIORUȘ, CĂTĂLIN IANĂȘI, ROXANA NICOLA, PAULA SFÎRLOAGĂ, PAULA SVERA, ANA-MARIA PUTZ.
DOI: 10.24193/subbchem.2020.1.15
Published Online: 2020-03-30
Published Print: 2020-03-30
pp. 189-203
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Spherical silica xerogels were synthesized by Stöber route using tetra-ethyl-orthosilicate (TEOS) in order to obtain good properties for opto-electronic and catalytic applications. The reactants mole ratio was n TEOS: H2O: ETOH: NH3 (where n = 0.098 ÷ 0.26: 0.45: 0.789: 0.06). To study these properties, we know from literature, that nanoparticles under 100 nm show unique electrical, mechanical and optical properties. We have choosen the optimum sample, with the smaller surface area and particles size of 91 nm. To improve the optical properties, this sample was further doped with 0.1% Ce3+. The obtained xerogel was thermally treated at 300, 600 and 900 oC. The changes in properties were put in evidence by morpho-textural (N2 adsorption–desorption isotherms and SEM images) and optical measurements (FT-IR, Fluorescence and Raman spectra’s).
Keywords: sol-gel, Ce (III) carbonate hydrate, Stöber, spherical particles.
