Year: 2013
Type: article
Abstract: Magnetic fluids, also called ferrofluids, are binary liquids consisting of magnetic nanoparticles being dispersed in a carrier liquid. They show very strong thermodiffusive behaviour with a Soret coefficient ( S T ) of approximately 0.16 K − 1 without a magnetic field. The dependence of the Soret coefficient on a magnetic field can lead to even higher values, and to a change in the coefficientʼs sign. This change in the direction of movement of the nanoparticles strongly affects the onset of thermomagnetic convection. A linear stability analysis reveals that thermodiffusion with a positive sign of the Soret coefficient enhances the onset of convection, whereas negative coefficients starting at about − 0.001 K − 1 suppress convection at all.
Source: Comptes Rendus Mécanique
Authors: Lisa Sprenger, Adrian Lange, Stefan Odenbach
Institution: Technische Universität Dresden
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
Funder: Deutsche Forschungsgemeinschaft
Award: G3832500889
OpenAlex ID: W1998199707