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Gels pp 57-63 | Cite as

Gels with magnetic properties

  • L. Barsi
  • A. Büki
  • D. Szabó
  • M. Zrinyi
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 102)

Abstract

Materials producing strain in magnetic field are known as magnetoelastic or magneto strictive materials. A new type has been developed by preparing magnetic field sensitive gels, called ferrogels. Single domain, magnetic particles of colloidal size are incorporated into chemically cross-linked polyvinyl-alcohol hydrogels. The finely distributed colloidal particles having superparamgnetic behavior couple the shape of the gel to the nonuniform external magnetic field. We have shown that ferrogels undergo quick and reversible shape transformation by changes in external magnetic field. Elongation, contraction and bending can be realized by proper arrangement of external magnetic field. Unidirectional deformation measurements have been performed and an equation for the uniaxial magnetoelastic properties has been derived and compared with experimental results.

Key words

Magnetic gels superparamagnetic behavior filled networks magnetoelasticity magnetostriction 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1996

Authors and Affiliations

  • L. Barsi
    • 1
  • A. Büki
    • 1
  • D. Szabó
    • 1
  • M. Zrinyi
    • 1
  1. 1.Department of Physical Chemistrytechnical University of BudapestBudapestHungary

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