Structural, Thermodiffusive and Thermoelectric Properties of Maghemite Nanoparticles Dispersed in Ethylammonium Nitrate - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ChemEngineering Année : 2020

Structural, Thermodiffusive and Thermoelectric Properties of Maghemite Nanoparticles Dispersed in Ethylammonium Nitrate

Kakoli Bhattacharya
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Mitradeep Sarkar
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Thomas Salez
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Sawako Nakamae
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Fabrice Cousin

Résumé

Ethylammonium nitrate (ionic liquid) based ferrofluids with citrate-coated nanoparticles and Na + counterions were synthesized for a wide range of nanoparticle (NP) volume fractions (Φ) of up to 16%. Detailed structural analyses on these fluids were performed using magneto-optical birefringence and small angle X-ray scattering (SAXS) methods. Furthermore, the thermophoretic and thermodiffusive properties (Soret coefficient S T and diffusion coefficient D m) were explored by forced Rayleigh scattering experiments as a function of T and Φ. They were compared to the thermoelectric potential (Seebeck coefficient, Se) properties induced in these fluids. The results were analyzed using a modified theoretical model on S T and Se adapted from an existing model developed for dispersions in more standard polar media which allows the determination of the Eastman entropy of transfer (Ŝ NP) and the effective charge (Z e f f 0) of the nanoparticles.
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Dates et versions

hal-03039035 , version 1 (03-12-2020)

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Kakoli Bhattacharya, Mitradeep Sarkar, Thomas Salez, Sawako Nakamae, Gilles Demouchy, et al.. Structural, Thermodiffusive and Thermoelectric Properties of Maghemite Nanoparticles Dispersed in Ethylammonium Nitrate. ChemEngineering, 2020, 4 (1), pp.5. ⟨10.3390/chemengineering4010005⟩. ⟨hal-03039035⟩
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