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Extensive characterization of magnetic microrods observed using optical microscopy

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Abstract

The usage of micro or nanorods is steadily increasing in various applications from fundamental research to industry. Therefore their geometrical, mechanical and eventually magnetic properties need to be well determined. Here, using an optical microscope equipped with magnetic tweezers, we report an experimental procedure to obtain all those information on a single magnetic rod. In particular, we measure magnetic susceptibility χ by analyzing the deformation of a rod subjected to a uniform magnetic field. To do so, we refine a theoretical model which takes into account the variation of χ with the internal field. We prove experimentally that this model yields consistent measurements, at any value of the field strength and the incidence angle. From the combination of the different measurements, we also deduce the number of iron oxide nanoparticles which are embedded within the polymer matrix of the superparamagnetic rods under study.

Graphical abstract: Extensive characterization of magnetic microrods observed using optical microscopy

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Publication details

The article was received on 20 Jan 2017, accepted on 04 May 2017 and first published on 04 May 2017


Article type: Communication
DOI: 10.1039/C7SM00147A
Citation: Soft Matter, 2017, Advance Article
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    Extensive characterization of magnetic microrods observed using optical microscopy

    F. Gerbal, Y. Wang, O. Sandre, F. Montel and J. Bacri, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00147A

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