In Situ Synthesis of Alumina Nanoparticles in a Binary Carbonate Salt Eutectic for Enhancing Heat Capacity
| Autor: | Syed Muhammad Mujtaba Rizvi, Baha El Far, Donghyun Shin, Yousof Nayfeh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
in situ synthesis Materials science molten salt Scanning electron microscope 020209 energy General Chemical Engineering 02 engineering and technology Article lcsh:Chemistry chemistry.chemical_compound Differential scanning calorimetry Nanofluid 0202 electrical engineering electronic engineering information engineering General Materials Science Molten salt Eutectic system Thermal decomposition thermal energy storage 021001 nanoscience & nanotechnology chemistry Chemical engineering lcsh:QD1-999 Carbonate nanomaterial specific heat 0210 nano-technology |
| Zdroj: | Nanomaterials, Vol 10, Iss 2131, p 2131 (2020) Nanomaterials Volume 10 Issue 11 |
| ISSN: | 2079-4991 |
| Popis: | A binary carbonate salt eutectic (Li2CO3-K2CO3)-based nanofluid was in situ synthesized by mixing with a precursor material, aluminum nitrate nonahydrate (Al(NO3)3· 9H2O). Thermal decomposition of the precursor was successfully carried out to synthesize alumina (Al2O3) nanoparticles at 1 wt.% concentration. A thermogravimetric analysis (TGA) confirmed a complete thermal decomposition of aluminum nitrate nonahydrate to alumina nanoparticles. A transmission electron microscope (TEM) was employed to confirm the size and shape of the in situ formed nanoparticles the result showed that they are spherical in shape and the average size was 28.7 nm with a standard deviation of 11.7 nm. Electron dispersive X-ray spectroscopy (EDS) confirmed the observed nanoparticles are alumina nanoparticles. A scanning electron microscope (SEM) was employed to study microstructural changes in the salt. A differential scanning calorimeter (DSC) was employed to study the heat capacity of the in situ synthesized nanofluid. The result showed that the heat capacity was enhanced by 21% at 550 ° C in comparison with pure carbonate salt eutectic. About 10&ndash 11 ° C decrease of the onset melting point of the binary carbonate salt eutectic was observed for the in situ synthesized nanofluids. |
| Databáze: | OpenAIRE |
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