New method for the synthesis of Al2O3–CaO and Al2O3–CaO–CaCO3 systems from a metallic precursor by the sol–gel route
| العنوان: | New method for the synthesis of Al2O3–CaO and Al2O3–CaO–CaCO3 systems from a metallic precursor by the sol–gel route |
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| المؤلفون: | Piotr Marciniak, Bogna Sztorch, Agnieszka Czapik, Mikołaj Stodolny, Robert E. Przekop, Agnieszka Martyła |
| المصدر: | Journal of the Australian Ceramic Society. 54:679-690 |
| بيانات النشر: | Springer Science and Business Media LLC, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Thermogravimetric analysis, Materials science, Thermal decomposition, Oxide, chemistry.chemical_element, 02 engineering and technology, Aluminium isopropoxide, Calcium, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, Calcium carbonate, chemistry, Chemical engineering, law, Calcination, 0210 nano-technology, Sol-gel |
| الوصف: | A series of binary Al2O3–CaO and Al2O3–CaO–CaCO3 systems with Ca/Al molar ratios of 0.05, 0.1, 0.25, 0.5 and 1.0 have been synthesised by the sol–gel technique from aluminium isopropoxide and metallic calcium powder. The rate of the metal reaction is used as a limiting factor to control the binary gel formation. The proposed modification of the traditional sol–gel method was used to examine the influence the effect of the metallic form of the second component as an oxide precursor on the form of the final product. By applying acetic acid instead of mineral acid, calcium acetate is formed and then decomposed to calcium carbonate upon thermal processing. During the synthesis of the binary systems, metallic calcium acts both as a precursor of calcium acetate and as a secondary pH modifier of the gel system. Calcination in air at 600 °C did not produce systems containing only oxides and the calcium carbonate phase was still present. Due to particle size reduction, the CaCO3 to CaO decomposition temperature was lowered. The systems were characterised by X-ray powder diffraction, low-temperature nitrogen adsorption, transmission and scanning electron microscopy (TEM, SEM and SEM/EDS), thermogravimetric analysis (TGA) and FTIR spectra. |
| تدمد: | 2510-1579 2510-1560 |
| DOI: | 10.1007/s41779-018-0197-0 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::644da5b1b91fccec9a7f522dc5cbc498 https://doi.org/10.1007/s41779-018-0197-0 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........644da5b1b91fccec9a7f522dc5cbc498 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 25101579 25101560 |
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| DOI: | 10.1007/s41779-018-0197-0 |