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

Laser Micromachining of Magnetoactive Elastomers as Enabling Technology for Magnetoresponsive Surfaces

“…ref. [47] and references cited therein. Further, the nanoparticles smaller than the critical size have a completely different magnetization mechanism than microparticles, because they are in the single‐domain state and ferromagnetic microparticles are in the multidomain state.…”

“…Further, the nanoparticles smaller than the critical size have a completely different magnetization mechanism than microparticles, because they are in the single‐domain state and ferromagnetic microparticles are in the multidomain state. [ 47 ] It has been also observed that the magnetorheological effect in MAEs, which is one of the manifestation of the magnetomechanical coupling, increases with the increasing size of microparticles. [ 49 ] One of possible reasons could be the effect of the total particle surface determining the level of interaction between the particle and the matrix.…”

“…[44][45][46] In principle, the MAEs can be also realized with nanoparticles as the filler, see, e.g., refs. [47,48]. In comparison with MAEs comprising microparticles, they have been reported to demonstrate lower restructuring of the filler and lower magnetization due to the size effect, cf.…”

“…ref. [47] and references A simple method for structuring of the surface of a magnetoactive elastomer (MAE) on the tens of micrometers scale, which capabilities extend beyond conventional mold-based polymer casting, is reported. The method relies on the ablation of the material by absorption of nanosecond infrared pulses from a commercial laser.…”

AC Field Threshold Effect as a Key Factor toward the Efficient Heating of Fluids with NaFeO2 Magnetic Nanoparticles

“…Magnetic nanoparticles are widely used in the creation of smart materials [8,9] and nanorobots; [10] to obtain magnetoactive materials with magnetic shape memory; [11][12][13] to obtain adhesives, [14] which are capable of heating in alternating magnetic fields (AMF) when gluing surfaces without thermal contact. The researchers' task consists of an appropriate choice of materials' components and corresponding experimental conditions to pave the way to achieve a necessary level of energy losses that is capable to guarantee a desirable temperature rise, generally not far from the room temperature.…”