Temperature blocking and magnetization of magnetoactive elastomers

Critical bending and shape memory effect in magnetoactive elastomers

“…This jump in the dependence ( , 0) L T H  is associated with the matrix melting/solidification at T=238 K, a jump-like process accompanied by the change of particle mobility in the MAE [52,66,74]. At a temperature lower than the solidification one, the positions of the magnetic particles in the matrix become fixed (effect of blocking), so that the magnetorheological effect of MAE diminishes [52,66]. In [52,66], when studying the effect of blocking, the sample was placed in an elastic-rigid cuvette and, therefore, the sample did not deform during magnetization.…”

“…At T=238 K, the beam demonstrates an abrupt change of its bending with an almost complete return to the shape of the initially undeformed sample at room temperature. This jump in the dependence ( , 0) L T H  is associated with the matrix melting/solidification at T=238 K, a jump-like process accompanied by the change of particle mobility in the MAE [52,66,74]. At a temperature lower than the solidification one, the positions of the magnetic particles in the matrix become fixed (effect of blocking), so that the magnetorheological effect of MAE diminishes [52,66].…”

Magnetoactive elastomer based on superparamagnetic nanoparticles with Curie point close to room temperature

“…The possibility of switching off the magnetic-elastic interactions by changing temperature are relevant and this effect can be additional controling parameter of these smart materials. This temperature effect can be similar to the solidification or glass transition of the MAE matrix upon cooling [9,10], when the MAE matrix becomes more rigid, the position of particles in the matrix becomes blocked, and restructuring of the MAE stops. However, near T C , the effect of weakening magnetoelastic coupling is associated not with a change in the elastic properties of the matrix, but with a change in the magnetic properties of the particles.…”

“…The study of composites with magnetic micro-or nanoparticles located in a polymer matrix is of great interest due to the possibility of remote (contactless) control of their properties by magnetic field and their application in soft robotics, biomedical, civil engineering, [1][2][3][4][5][6]. If the particles are in an elastomer matrix, they can be displaced relative to each other under the magnetic interparticle interaction forces [7][8][9][10]. It leads to deformation of the matrix and the appearance of composite restructuring under magnetic field, and, as a consequence, the particle chains or a columnar structure can be formed.…”

Magnetorheological effect in elastomers containing uniaxial ferromagnetic particles

“…The magnetic field affects MAE through its magnetic subsystem, understandably [3][4][5][6][7]. MAE can not only be deformed, even substantially, by tens of percent, but also can change its physical properties and characteristics [8][9][10][11][12][13]. The change of MAE elastic modules has been defined as the magnetorheological effect (MRE) [14][15][16][17][18].…”