Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)
| Autor: | Nada Čitaković, Zuzana Melichová, Bratislav Ž. Todorović, Vladimir B. Pavlović, Ljiljana Kljajević, Marija Stojmenović, Snežana S. Nenadović |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering 02 engineering and technology Conductivity Geopolymer lcsh:Biochemistry Metadiatomite Aluminosilicate Electrical conductivity Ionic conductivity lcsh:QD415-436 lcsh:Chemical engineering Metakaolin 020502 materials lcsh:TP155-156 General Chemistry metabentonite metakaolin metadiatomite geopolymer electrical conductivity Atmospheric temperature range 021001 nanoscience & nanotechnology Microstructure Metabentonite 0205 materials engineering Chemical engineering Solid oxide fuel cell 0210 nano-technology |
| Zdroj: | Macedonian Journal of Chemistry and Chemical Engineering, Vol 38, Iss 2, Pp 283-292 (2019) Macedonian Journal of Chemistry and Chemical Engineering |
| ISSN: | 1857-5625 1857-5552 |
| Popis: | Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composition. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 × 10–2 Ω–1cm–1at 700 ºC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500–700 ºC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Oxide Fuel Cell). |
| Databáze: | OpenAIRE |
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