Structural, Thermodiffusive and Thermoelectric Properties of Maghemite Nanoparticles Dispersed in Ethylammonium Nitrate - Archive ouverte HAL Access content directly
Journal Articles ChemEngineering Year : 2020

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

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Kakoli Bhattacharya
  • Function : Author
  • PersonId : 1084256
Mitradeep Sarkar
  • Function : Author
  • PersonId : 1084257
Thomas Salez
  • Function : Author
Sawako Nakamae
  • Function : Author
  • PersonId : 856828
Fabrice Cousin
  • Function : Author
  • PersonId : 862484

Abstract

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 and 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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