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Riedl_submitted_march_2021.pdf (6.23 MB)

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

submitted on 14.03.2021, 22:11 and posted on 16.03.2021, 06:39 by Jesse Cornelius Riedl, Mitradeep Sarkar, Thiago Fiuza, Fabrice Cousin, Jérome Depeyrot, Emmanuelle DUBOIS, Guillaume Mériguet, Régine Perzynski, Véronique Peyre

The use of ionic liquid-based colloids at elevated temperatures is one of their most promising fields of application. However long term stability on the whole range of temperature is mandatory. First a detailed study on colloidal dispersions of iron oxide nanoparticles in EMIM TFSI is performed at room temperature in order to determine the best solid/liquid interface. The previously identified key parameters are tuned: the surface charge density and the nature of the counterions. Here a sulfonate based imidazolium ion is chosen. In a second step, the thermal stability of these nanoparticle dispersions is analysed on the short and long term up to 473 K (200◦C) combining dynamic light scattering (DLS), small angle X-ray/neutron scattering (SAXS/SANS) and thermogravimetric analysis (TGA). Ionic liquid-based colloidal dispersions of iron oxide nanoparticles in EMIM TFSI stable in the long term can be obtained at least up to 473 K and nanoparticle concentrations of 12 vol% (≈30wt%)


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Sorbonne University



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No conflicts of interest

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submitted article