Colloidal stability of molten salt –based nanofluids: Dynamic Light Scattering tests at high temperature conditions
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Other documents of the author: Navarrete Argilés, Nuria; Gimeno Furió, Alexandra; Forner Escrig, Josep; Juliá Bolívar, José Enrique; Mondragon, Rosa
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comunitat-uji-handle2:10234/7035
comunitat-uji-handle3:10234/8617
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Title
Colloidal stability of molten salt –based nanofluids: Dynamic Light Scattering tests at high temperature conditionsAuthor (s)
Date
2019Publisher
ElsevierISSN
1873-328XBibliographic citation
NAVARRETE, Nuria, et al. Colloidal stability of molten salt–based nanofluids: Dynamic Light Scattering tests at high temperature conditions. Powder Technology, 2019, vol. 352, p. 1-10.Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S0032591019302931Version
info:eu-repo/semantics/acceptedVersionSubject
Abstract
The use of molten salt-based nanofluids as heat transfer fluids or thermal energy storage materials to increase the
efficiency of Concentrated Solar Power plants has gained attention due to the use of the renewable ... [+]
The use of molten salt-based nanofluids as heat transfer fluids or thermal energy storage materials to increase the
efficiency of Concentrated Solar Power plants has gained attention due to the use of the renewable energies
against Global Warming. One of the issues of interest is the colloidal stability of the nanoparticles dispersed in
ionic media like molten salts. In this work a new experimental set-up to measure the particle size distribution
of molten salt-based nanofluids by means of Dynamic Light Scattering was developed. The colloidal stability of
silica and Al/Cu nanoparticles dispersed in solar salt (NaNO3-KNO3) was experimentally measured for the first
time. Silica nanoparticles were dispersed in water, calcium nitrate tetrahydrate and solar salt, and the formation
of micrometrical agglomerates was observed when molten salts were used as base fluid due to the high ionic
strength of the medium and the reduced Debye length. The influence of the nanoparticle composition was proved
to be also important. For the Al/Cu metal alloy nanoparticles the agglomerates formed were smaller than for silica. Besides, even though both nanoparticles settle after 4 h in static conditions, only Al/Cu nanoparticles recover
the initial particle size distribution when they are mechanically redispersed [-]
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Powder Technology 352 (2019)Investigation project
ENE2016-77694-R ; UJI-B2016-47Rights
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