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Viscoelasticity of mono- and polydisperse inverse ferrofluids

Title data

Saldivar-Guerrero, Ruben ; Richter, Reinhard ; Rehberg, Ingo ; Aksel, Nuri ; Heymann, Lutz ; Rodriguez-Fernández, Oliverio S.:
Viscoelasticity of mono- and polydisperse inverse ferrofluids.
In: The Journal of Chemical Physics. Vol. 125 (2006) Issue 8 . - Eintrag 084907.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.2337576

Abstract in another language

We report on measurements of a magnetorheological model fluid created by dispersing nonmagnetic microparticles of polystyrene in a commercial ferrofluid. The linear viscoelastic properties as a function of magnetic field strength, particle size, and particle size distribution are studied by oscillatory measurements. We compare the results with a magnetostatic theory proposed by De Gans et al. [Phys. Rev. E 60, 4518 (1999)] for the case of gap spanning chains of particles. We observe these chain structures via a long distance microscope. For monodisperse particles we find good agreement of the measured storage modulus with theory, even for an extended range, where the linear magnetization law is no longer strictly valid. Moreover we compare for the first time results for mono- and polydisperse particles. For the latter, we observe an enhanced storage modulus in the linear regime of the magnetization.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Faculties > Faculty of Engineering Science > Chair Applied Mechanis and Fluid Dynamics
Faculties > Faculty of Engineering Science > Chair Applied Mechanis and Fluid Dynamics > Chair Applied Mechanis and Fluid Dynamics - Univ.-Prof. Dr. Nuri Aksel
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Engineering Science
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 18 Nov 2015 11:21
Last Modified: 28 Sep 2018 07:54
URI: https://eref.uni-bayreuth.de/id/eprint/22659