Host: Paul A. Janmey
Monday, June 10, 2019, 12:00 PM – 5:00 PM
Laboratory for Research on the Structure of Matter, Reading Room
Magnetostriction of Ferrogels
Andrejs Cēbers, Professor, Laboratory of Soft Magnetic Matter University of Latvia,
Incorporation of ferromagnetic particles in a soft material enables large and rapid changes to their elastic moduli when a magnetic field is applied. Material constants responsible for the magnetostriction of magnetic gels are derived by using a local effective field approach. As an example, the classical problem of deformation of an ellipsoidal sample of ferrogel is considered by using the virial method. The relations obtained for material constants are applied to experimental data for the shear modulus of a ferrogel and the normal force acting on the plates of a rheometer as a function of the applied field. The theory predicts a quadratic dependence of shear storage modulus and normal force on the field strength, in agreement with experimental data. This analysis also provides estimates of magnetic permeability of the ferrogel, which are in reasonable agreement with experiments.
Plus, talks from CEMB lab members and guests
Workshop is FREE but requires REGISTRATION