The level of cross-linking and the structure of anisotropic magnetorheological elastomers

Evaluation of highly compliant magneto‐active elastomers with colossal magnetorheological response

“…The inserted lines in Figure represent second order polynomial fits (which are only intended as a guide to the eye). From these results, it can be concluded that the iron particles used inhibit the curing, what had a positive effect in our case (reduction of G 0 ′ leads to the enhancement of relative MR effect because this effect is inversely proportional to G 0 ′). We are aware of only one publication reporting a decrease of G 0 ′ with the growing concentration of CIP particles in hard MAE samples (pure Sylgard® 184) with G 0 ′ ranging between 400 and 800 kPa …”

Dynamic moduli of magneto-sensitive elastomers: a coarse-grained network model

“…6,8,56 At the same time, theoretical description of this effect is not a trivial problem, since (i) the quadratic terms of the mechanical potential U mech (δ r n ) ∼ δ r 2 n are not enough to compensate the magnetic potential, as can be seen from eqn (9), and the nonlinear elasticity should be taken into account; (ii) irregularity of the local spatial distribution of particles can play a significant role for the rearrangement. Thus, at M > M * an unstable equilibrium state takes place at δ r n = 0 and the particles are expected to rearrange and to form chain-like agglomerates along the magnetic field.…”

“…2,3 Different kinds of magnetizable particles with different shapes and sizes can be used as magnetic fillers. 4,6,8 Due to high importance of MSEs for practice, their mechanical properties have been extensively studied during the last decade. [4][5][6] Although the microsize carbonyl iron particles have a multi-domain magnetic structure, very narrow hysteresis cycles for the powders and composites with these particles were observed which indicate a soft magnetic be- haviour.…”

Aggregation dynamics and magnetic properties of magnetic micrometer-sized particles dispersed in a fluid under the action of rotating magnetic fields

“…has been working on such systems and has verified that hardening the system in that configuration by a physical method (in our case, by curing a commercial silicone with dispersed particles while applying the field) generates an anisotropic magnetic system [6][7][8]. Moreover, for similar field-structured magnetorheological elastomers, the microstructure morphology [9], the influence of the concentration of the magnetic powder on the level of cross-linking [10], and an analysis of magnetic field-induced phase transitions [11], have been analyzed by X-ray computed tomography. It is also possible to produce elastic materials that exhibit simultaneously magnetoelectrical and piezoelectrical properties.…”

“…The application of a constant, unidirectional (uniaxial) field to that kind of colloids has been studied extensively [4][5][6][7][8][9][10][11][12][13]. The individual particle magnetic moment is subjected to a torque that tends to align the particle's easy axis with the applied field direction.…”