Geopolymers
Inorganic polymeric new materials
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T. M. Milão
T. M. Milão
Departamento de Química, UFSCar—Universidade Federal de São Carlos, Rodovia Washington Luiz, Km 235, São Carlos, SP, 13565-905, Brazil
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J. F. A. Oliveira
J. F. A. Oliveira
Departamento de Química, UFSCar—Universidade Federal de São Carlos, Rodovia Washington Luiz, Km 235, São Carlos, SP, 13565-905, Brazil
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V. D. Araújo
V. D. Araújo
Instituto de Física de São Carlos, USP—Universidade de São Paulo, Av. Trabalhador São-carlense, 400, São Carlos, SP, 13560-970, Brazil
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M. I. B. Bernardi
M. I. B. Bernardi
Instituto de Física de São Carlos, USP—Universidade de São Paulo, Av. Trabalhador São-carlense, 400, São Carlos, SP, 13560-970, Brazil
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Abstract
Zinc oxide is a widely used white inorganic pigment. Transition metal ions are used as chromophores and originate the ceramic pigments group. In this context, ZnO particles doped with Co, Fe, and V were synthesized by the polymeric precursors method, Pechini method. Differential scanning calorimetry (DSC) and thermogravimetry (TG) techniques were used to accurately characterize the distinct thermal events occurring during synthesis. The TG and DSC results revealed a series of decomposition temperatures due to different exothermal events, which were identified as H2O elimination, organic compounds degradation and phase formation. The samples were structurally characterized by X-Ray diffractometry revealing the formation of single phase, corresponding to the crystalline matrix of ZnO. The samples were optically characterized by diffuse reflectance measurements and colorimetric coordinates L*, a*, b* were calculated for the pigment powders. The pigment powders presented a variety of colors ranging from white (ZnO), green (Zn0.97Co0.03O), yellow (Zn0.97Fe0.03O), and beige (Zn0.97V0.03O).
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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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