Colloidal stability of molten salt –based nanofluids: Dynamic Light Scattering tests at high temperature conditions

Navarrete, Nuria Martínez; Gimeno-Furio, A.; Forner-Escrig, Josep; Juliá, J. Enrique; Mondragón, Rosa

doi:10.1016/j.powtec.2019.04.045

Cited by 29 publications

(15 citation statements)

References 28 publications

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“…Although such systems at high temperature are envisaged for heat transfer fluids [13] or lubricants [33], the charge of the NPs is seldom considered and never varied. Moreover, the nanostructure of the dispersion at high temperature has only been considered recently by DLS in molten salts [35].…”

Section: Discussionmentioning

confidence: 99%

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Design of concentrated colloidal dispersions of iron oxide nanoparticles in ionic liquids: Structure and thermal stability from 25 to 200 °C

Riedl

Sarkar

Fiuza

et al. 2022

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 99%

“…Silica NPs dispersed in BMIM BF 4 were studied up to 60 ˝C, showing a change in interactions and rheological properties [34]. At higher temperature, only few nanoparticles in molten salts have been recently studied by Dynamic Light Scattering (DLS) on a range of temperature above their melting point [35].…”

Section: Introductionmentioning

confidence: 99%

Design of concentrated colloidal dispersions of iron oxide nanoparticles in ionic liquids: Structure and thermal stability from 25 to 200 °C

Riedl

Sarkar

Fiuza

et al. 2022

Journal of Colloid and Interface Science

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“…After ~150 nm, the hardness and modulus remain relatively unchanged with the increase of indentation depth. Hardness of ~40 GPa and elastic modulus of ~500 GPa are obtained (compared with the reported values of 25-35 GPa for hardness and 500-560 GPa for elastic modulus for TiB2 14 ). From these findings, it is concluded that the EPD of TiB2 nanoparticles has been successfully achieved in molten fluorides, yielding a coherent TiB2 coating with high hardness.…”

mentioning

confidence: 82%

Preparation of diboride coatings by electrophoretic deposition in nanoparticle-containing molten inorganic salts

et al. 2022

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Molten inorganic salts containing solid nanoparticles with a stable and uniform dispersion have attracted great attention as efficient heat transfer and storage materials 1,2 and for catalysis for chemical reactions [3][4][5] . Electrophoretic deposition in molten inorganic salts containing nanoparticles, have not been reported in the literature, compared with the related wide investigations in aqueous and organic suspensions 6,7 . Here we report the possibility of electrophoretic deposition of nanoparticles in high-temperature molten salts. In molten fluorides and chlorides, cell voltages of 1.2-1.5 V below the decomposition voltage of the electrolytes, were applied to perform the electrophoretic deposition of nanoparticles (e.g., TiB2 and ZrB2) on different cathode substrates, resulting in compact and adhesive coatings with high hardness. These findings should present opportunities to synthesize additional coatings and films via the proposed process.

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“…Silica NPs dispersed in BMIM BF 4 were studied up to 60 ˝C, showing a change in interactions and rheological properties [33]. At higher temperature, only few nanoparticles in molten salts have been recently studied by Dynamic Light Scattering (DLS) on a range of temperature above their melting point [34].…”

Section: Introductionmentioning

confidence: 99%

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

Riedl¹,

Sarkar²,

Fiuza³

et al. 2021

Preprint

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Some of the most promising fields of application of ionic liquid-based colloids imply elevated temperatures. Their careful design and analysis is therefore essential. The system studied are iron oxide nanoparticles (NPs) dispersed in ethyl-methylimidazolium bistriflimide (EMIM TFSI). The key parameters of the solid-liquid interface, tuned at room temperature, are the surface charge density and the nature of the counterions. The thermal stability of these nanoparticle dispersions is then analysed on the short and long term up to 473 K. A multiscale analysis is performed combining dynamic light scattering (DLS), small angle X-ray/neutron scattering (SAXS/SANS) and thermogravimetric analysis (TGA). With a careful choice of the species at the solid-liquid interface, ionic liquid-based colloidal dispersions of iron oxide NPs in EMIM TFSI stable over years at room temperature can be obtained, also stable at least over days up to 473 K and NPs concentrations up to 12 vol% (30 wt%).

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Colloidal stability of molten salt –based nanofluids: Dynamic Light Scattering tests at high temperature conditions

Cited by 29 publications

References 28 publications

Design of concentrated colloidal dispersions of iron oxide nanoparticles in ionic liquids: Structure and thermal stability from 25 to 200 °C

Design of concentrated colloidal dispersions of iron oxide nanoparticles in ionic liquids: Structure and thermal stability from 25 to 200 °C

Preparation of diboride coatings by electrophoretic deposition in nanoparticle-containing molten inorganic salts

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

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