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Journal of Materials Science and Nanotechnology | Volume 2
October 29-30, 2018 | London, UK
Nanomaterials and Nanotechnology
International Conference on
Synthesis of Al
2
O
3
-SiO
2
core shell nanomaterials for development of stable nanofluids for thermal
energy storage applications
Udayashankar Nithiyanantham
CIC Energigun, Spain
N
owadays, nanomaterials have great revolution for improving
the efficiency of different types of renewable energies,
whichhavebeen identifiedas aunique source to fulfil thepresent
and future energy demand as well as to contribute to global
warming problem. With this regard, concentrated solar power
(CSP) technology was considered as a promising solution due to
its higher dispatchability thanks to the incorporation of a cost-
effective thermal energy storage (TES) system. Currently, the TES
system is based on the two-tank-storage technology by using the
binary NaNO
3
-KNO
3
(60:40 wt.%) molten salt, so-called solar salt,
as storagemedia. Inthe last years, thedevelopmentofnanofluids,
by the addition of minor percentage of nanoparticles to base
salt, with enhanced thermophysical properties was investigated.
Although nanofluids with enhanced heat capacity and thermal
conductivity were achieved when SiO
2
and Al
2
O
3
nanoparticles
were used, their stability still not yet demonstrated due to the
separationwith time of nanoparticles fromthe salt. However, the
experiment work made in our facilities demonstrated different
behaviours of these nanomaterials where a settle down of
SiO
2
nanoparticles and a floating of Al
2
O
3
nanoparticles were
observed, which may due to the density difference between
liquid molecules and nanoparticles. However, the development
of advanced mixed nanoparticles becomes of high importance
in order to improve the nanofluid stability. The present research
work is focused on development of stable nanofluids based on
inorganic salts, by the addition of advanced Al
2
O
3
-SiO
2
core shell
nanomaterials with different densities obtained by changing the
alumina to silica ratio. The formation of the core shell structure
was initially confirmed by TEMand FTIR analyses. The nanofluids
thermophysical properties enhancements were studied by
DSC, LFA and rheometer techniques. Finally, their stability was
investigated by TGA and long-term stability tests in the furnace.
Speaker Biography
Udayashankar Nithiyanantham is pursuing his PhD degree in Physics at University of
Basque Country (UPV/EHU). The research work of his PhD, which is under development
at CIC Energigune, is focused on to the synthesis, characterization of inorganic molten
salts based nanofluids and their potential applications in medium and high temperatures
thermal energy storage applications.
e:
nudayashankar@cicenergigune.com