Analysis of the optical transmission of a ferrofluid by an electromagnetic mixture law

Sanz-Felipe, Á. (Universidad de Zaragoza) ; Martín, J.C. (Universidad de Zaragoza)

Resumen: Evolution of the optical transmission of a ferrofluid after magnetic field commutation is analyzed by means of an approach based on the so-called mixture laws: expressions which predict the effective permittivity of heterogeneous media as a function of their constituents' permittivities, their proportions and the way they are arranged. In particular, this work is based on a law proposed by Sihvola and Kong for the effective permittivity of a host substance with ellipsoidal inclusions. Ferrofluids are peculiar examples of this kind of media: with the solvent as host, the inclusions are nanoparticle agglomerates whose shapes become modified by magnetic field exposure. In this work, experimental optical transmission of a ferrofluid is compared with predictions based on Sihvola and Kong''s law. A remarkable coincidence is obtained both in the absence of magnetic field, without using any fitting parameter, and in the presence of magnetic field, employing the inclusions' average ellipticity as the fitting parameter. The results obtained for time dependent optical transmission of a ferrofluid after magnetic field switch on or off allow one to estimate how the average shape of the agglomerates evolves over time. On the other hand, mixture laws are proven to be an interesting alternative to scattering concepts to model the optical transmission changes experienced by ferrofluids once they are exposed to magnetic fields.

Idioma: Inglés

DOI: 10.1088/1361-6463/aab05f

Año: 2018

Publicado en: JOURNAL OF PHYSICS D-APPLIED PHYSICS 51, 13 (2018), 135001 [6 pp]
ISSN: 0022-3727

Factor impacto JCR: 2.829 (2018)

Categ. JCR: PHYSICS, APPLIED rank: 45 / 148 = 0.304 (2018) - Q2 - T1

Factor impacto SCIMAGO: 0.805 - Acoustics and Ultrasonics (Q1) - Surfaces, Coatings and Films (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/TEC2014-52642-C2-2-R
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2017-CIE-07

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Electromagnetismo (Dpto. Física Aplicada)
Área (Departamento): Área Óptica (Dpto. Física Aplicada)