Kinetics of the shape change of magnetic field sensitive polymer gels

Fabrication of a short carbon fiber/gel composite that responds to a magnetic field

“…Recently, materials responsive to magnetic fields such as magnetostirictive materials [11,12] and ferrogels [13,14] as actuators has drawn considerable attention.…”

Mechanics of magneto-active polymers

“…To utilize the theory, a material model is specified and the weakform is derived for finite-element implementation. (Zrí nyi et al, 1996(Zrí nyi et al, , 1998Snyder et al, 2010;Nguyen and Ramanujan, 2010). Strains of up to 40% when exposed to a non-uniform magnetic field have also been reported (Zrí nyi et al, 1997a).…”

“…These magnetocontrolled soft and swellable gels are promising materials in the growing family of stimuli-responsive gels and actuators. In the past decades, ferrogels have received developments on a variety of changes in shape (Zrí nyi et al, 1996;Snyder et al, 2010a;2010b), water retention (Liu et al, 2006a;Filipcsei et al 2007;Herná ndez et al, 4 2010), stiffness (Misumata et al, 1999;Varga et al 2006) and viscoelasticity (Zrí nyi et al, 1998;Herná ndez, 2004;Herná ndez et al, 2010;Faidley et al, 2010) under magnetic fields.…”

“…However, the elastic theories become deficient when the dynamic response of a viscoelastic ferrogel is of interest. Partly due to the viscoelasticity of the polymer matrices, the responses of ferrogels are often rate-dependent, as demonstrated in various experiments (Zrí nyi et al, 1998;Herná ndez, 2004;Faidley et al 2010). Very few researches have been carried out on modeling the viscoelastic behaviors of ferrogels.…”

“…Very few researches have been carried out on modeling the viscoelastic behaviors of ferrogels. Some models use combinations of linear springs and dashpots to fit the dynamic responses of ferrogels to cyclic magnetic fields (Zrí nyi et al, 1998;Rao et al, 2010;Faidley et al, 2010).…”