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

ChemEngineering

Fabrice Cousin¹  ThomasJ. Salez²  Sawako Nakamae²  Kakoli Bhattacharya²  Véronique Peyre³  Emmanuelle Dubois³  Gilles Demouchy³  Mitradeep Sarkar³  Laurent Michot³  Régine Perzynski³ 

[1] Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette, CEDEX, France;Service de Physique de l’état Condensé, SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette, CEDEX, France;Sorbonne Université, CNRS, Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), 4 Place Jussieu, F-75005 Paris, France;

关键词: ionic liquids;    thermodiffusion;    seebeck coefficient;    thermogalvanic applications;   

DOI  :  10.3390/chemengineering4010005

来源: DOAJ

【 摘 要 】

Ethylammonium nitrate (ionic liquid) based ferrofluids with citrate-coated nanoparticles and Na ${}^{+}$ counterions were synthesized for a wide range of nanoparticle (NP) volume fractions ( $\mathsf{\Phi }$ ) 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 $S_{\mathrm{T}}$ and diffusion coefficient $D_{\mathrm{m}}$ ) were explored by forced Rayleigh scattering experiments as a function of T and $\mathsf{\Phi }$ . 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 $S_{\mathrm{T}}$ 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 ( ${\widehat{S}}_{\mathrm{NP}}$ ) and the effective charge ( $Z_0^{eff}$ ) of the nanoparticles.

【 授权许可】

Unknown