Response of Ferrogels Subjected to an AC Magnetic Field

When a ferrogel, which is chemically cross-linked polymer networks swollen with a ferrofluid, consisting of magnetic particles having nonlinear characteristics is subjected to an alternating current (ac) magnetic field, the magnetic response will generally consist of ac fields at frequencies of the...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-06, Vol.110 (22), p.10738-10745
Main Authors: Wang, G, Tian, W. J, Huang, J. P
Format: Article
Language:English
Subjects:
Gels
Iron Compounds
Magnetics
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Summary:When a ferrogel, which is chemically cross-linked polymer networks swollen with a ferrofluid, consisting of magnetic particles having nonlinear characteristics is subjected to an alternating current (ac) magnetic field, the magnetic response will generally consist of ac fields at frequencies of the higher-order harmonics. By using a perturbation approach, we investigate nonlinear ac responses of ferrogels, under an ac magnetic field either coupled with a dc magnetic field or not. It is shown that it is possible to detect the volume fraction and shape of particles in ferrogels by measuring such ac responses. Our results are very well understood in spectral representation and are favorably compared with the experimental observations of suspensions being beyond ferrogels.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp060349u