In situ synthesis of alumina nanoparticles in a binary carbonate salt eutectic for enhancing heat capacity

Yousof Nayfeh, Syed Muhammad Mujtaba Rizvi, Baha El Far, Donghyun Shin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 550C in comparison with pure carbonate salt eutectic. About 10-11C decrease of the onset melting point of the binary carbonate salt eutectic was observed for the in situ synthesized nanofluids.

Original languageEnglish
Article number2131
Pages (from-to)1-12
Number of pages12
Issue number11
StatePublished - Nov 2020


  • In situ synthesis
  • Molten salt
  • Nanomaterial
  • Specific heat
  • Thermal energy storage


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