抄録
Effects of matrix on the giant reduction in storage modulus of magnetic gels have been investigated using agar and carrageenan gels. The complex modulus was measured before and after magnetization of the gel by dynamic viscoelastic measurements with a compressional strain. The agar magnetic gels showed a large nonlinear viscoelastic response and magnetically-induced deformation. The giant reduction in the storage modulus of ~10^5 Pa, and also in the loss modulus of ~10^4 Pa was observed for agar magnetic gels, as well as carrageenan one. The deformation due to magnetization seen in agar magnetic gels was larger than that in carrageenan by more than twice. Rheological data, deformation due to magnetization, and morphologies of magnetic particles have been discussed.
