Chlorine-free, monolithic lanthanide series rare earth oxide aerogels via epoxide-assisted sol-gel method
authors Worsley, MA; Ilsemann, J; Gesing, TM; Zielasek, V; Nelson, AJ; Ferreira, RAS; Carlos, LD; Gash, AE; Baumer, M
nationality International
journal JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
author keywords Rare earth oxide; Aerogel; Sol-gel; Monolith; Catalyst; Photoluminescence; Rietveld refinement
keywords X-RAY-DIFFRACTION; POWDER NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; MAGNETIC-SUSCEPTIBILITY; PRASEODYMIUM OXIDE; SINGLE-CRYSTALS; A-FORM; B-TYPE; ELECTRON-DIFFRACTION; LATTICE-PARAMETERS
abstract Synthesis of chlorine-free, rare earth oxide aerogels from the lanthanide series was achieved using a modified epoxide-assisted sol-gel method. An ethanolic solution of the hydrated metal nitrate, propylene oxide, and ammonium carbonate was found to gel upon heating to 333K. Critical point drying of the wet gel in CO2 yielded monolithic aerogels. Most of the aerogels were amorphous as-prepared, but became nano-crystalline after calcination at 923K in air. The aerogels had high surface areas (up to 150m(2)/g), low densities (40-225mg/cm(3)), and were photoluminescent. [GRAPHICS] HighlightsRare earth oxide aerogels were prepared by epoxide-assisted sol-gel route.Rare earth oxide aerogels are monolithic, chlorine-free, and possess large surface areas.Calcination at 923K results in nano-crystalline aerogels, with particles less than 25nm in diameter.Characterization of these aerogels includes photoluminescence spectroscopy, Rietveld refinements, and electron microscopy.
publisher SPRINGER
issn 0928-0707
year published 2019
volume 89
issue 1
beginning page 176
ending page 188
digital object identifier (doi) 10.1007/s10971-018-4811-y
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000458027800022
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