Issue 29, 2012
From the journal:

Soft Matter

Non-linear alignment dynamics in suspensions of platelets under rotating magnetic fields†

Randall M. Erb,a   Jana Segmehl,a   Michalis Charilaou,bc   Jörg F. Löfflerb  and  André R. Studart*a  

* Corresponding authors

a Complex Materials, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
E-mail: andre.studart@mat.ethz.ch

b Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland

c Earth and Planetary Magnetism, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland

Abstract

Under rotating magnetic fields, micron-sized platelets suspended in a fluid and decorated with magnetic nanoparticles are found to assume two orientational states. This behavior is very attractive for the development of unusual reinforcement architectures in synthetic composites. However, it is highly dependent on the frequency of the magnetic field and the rheological properties of the fluid. At low frequencies or fluid viscosities, the magnetized platelets continuously rotate in the fluid. At high frequencies and fluid viscosities, a non-linear response is observed in which the platelets align parallel to the plane of the rotating field. In this study we offer a theoretical description and experimental verification of this phenomenon, which can be used to build composites with fully aligned platelet reinforcement.

Graphical abstract: Non-linear alignment dynamics in suspensions of platelets under rotating magnetic fields

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Article information

DOI
https://doi.org/10.1039/C2SM25650A
Article type
Paper
Submitted
21 Mar 2012
Accepted
17 May 2012
First published
21 Jun 2012

Soft Matter, 2012,8, 7604-7609

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Non-linear alignment dynamics in suspensions of platelets under rotating magnetic fields

R. M. Erb, J. Segmehl, M. Charilaou, J. F. Löffler and A. R. Studart, Soft Matter, 2012, 8, 7604 DOI: 10.1039/C2SM25650A

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