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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STUDIA CHEMIA - Issue no. 4 / 2012 | |||||||
Article: |
THERMAL DECOMPOSITION AND KINETICS OF THE PRECURSORS FOR OBTAINING ZnO AND TEAH MODIFIED ZnO NANOPOWDERS. Authors: MIHAELA POPA, AMALIA MESAROS. |
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Abstract: The thermal decomposition of zinc oxalate, obtained from the precipitation of zinc acetate with oxalic acid, with and without tetraethylammonium hydroxide (TEAH) addition, was investigated. The thermogravimetric analysis (TG) indicated a total mass loss of about 57% in two decomposition steps. FTIR-TG-DTA and MS-TG-DTA indicated mainly CO2 elimination. The activation energies (Ea) were estimated by Kissinger equation, considering heating rates of 5, 10, 15, 20°C/min. The determined energies were: Ea1 = 69 kJ/mol, for the dehydration process and of about Ea2 = 106 kJ/mol, for organic compounds loss. Keywords: ZnO, nanopowders, thermal decomposition |
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