Geopolymers
Inorganic polymeric new materials
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J. Maul
J. Maul
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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A. S. Brito
A. S. Brito
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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A. L. M. de Oliveira
A. L. M. de Oliveira
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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S. J. G. Lima
S. J. G. Lima
LSR, Depto de Engenharia Mecânica/CT, UFPB, João Pessoa, PB, Brazil
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M. A. M. A. Maurera
M. A. M. A. Maurera
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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D. Keyson
D. Keyson
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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A. G. Souza
A. G. Souza
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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I. M. G. Santos
I. M. G. Santos
LACOM/INCTMN, Departamento de Química, CCEN, UFPB, João Pessoa, PB, Brazil
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Abstract
Copper monoxide (CuO) was successfully obtained by microwave-assisted hydrothermal method, using different conditions—in a solution without base, in a solution alkalinized with NaOH or with NH4OH. The powders were analyzed by thermal analysis (TG/DTA), X-ray diffraction (XRD), infrared spectroscopy, UV–Visible spectroscopy, and scanning electronic microscopy. XRD results showed that CuO was obtained with monoclinic structure and without secondary phases. Thermal analysis and infrared spectra indicated the presence of acetate groups on the powder surface. TG curves also showed a mass gain assigned to the Cu(I) oxidation indicating that a reduction possibly occurred during synthesis. The high and broad absorption band in the UV–Vis spectroscopy from 250 to 750 nm indicated the coexistence of Cu(II) and Cu(I), confirming the Cu(II) reduction, inside the CuO lattice. It was also possible to confirm the Cu(II) reduction by a displacement of the Me–O vibration bands observed in the IR spectra at around 500 cm−1.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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