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Intelligent polymer gels controlled by magnetic fields
Authors:M Zrínyi
Institution:(1) Department of Physical Chemistry Technical University of Budapest H-1521 Budapest, Hungary e-mail: zrinyi.fkt@chem.bme.hu Tel.:36-1-4633229 Fax: 36-1-4633939, HU
Abstract: In this paper we summarise the effects induced by electric and magnetic fields on the mobility and shape of polymer gels containing a complex fluid as a swelling agent. Magnetic-field-sensitive gel beads and monolith gels have been prepared by introducing magnetic particles of colloidal size into chemically cross-linked poly(N-isopropylacrylamide) and poly(vinyl alcohol) hydrogels. The influence of uniform and nonuniform fields has been studied. In uniform magnetic fields the gel beads form straight chainlike structures, whereas in nonhomogeneous fields the beads aggregates due to the magnetophoretic force directed to the highest field intensity. The ability of magnetic-field-sensitive gels to undergo quick, controllable changes in shape can be used to mimic muscular contraction. Received: 26 July 1999/Accepted: 27 August 1999
Keywords:Intelligent material  Responsive gels  Magnetic-field-sensitive polymer gel  Artificial muscle
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