Modulus-tunable magnetorheological elastomer microcantilevers

Abstract

Modulus-tunable microcantilevers are fabricated from magnetorheological elastomers (MREs) consisting of polydimethylsiloxane and carbonyl iron particles by using a simple sandwich molding method. Depending on the presence or absence of an external magnetic field during curing, isotropic or anisotropic MRE cantilevers are obtained. Randomly distributed particles are present in the polymer matrix of the isotropic microcantilevers, whereas the particles in the anisotropic microcantilevers are aligned in the direction of the magnetic field. The fractional changes in the resonance frequencies of the MRE cantilevers are measured as functions of the magnetic field intensity and the quantity of particles in the matrix. The anisotropic microcantilevers undergo greater changes in frequency than the isotropic microcantilevers when exposed to external magnetic fields, which indicates that larger changes in modulus are induced in the anisotropic microcantilevers. In addition, the dissipation and damping ratios of the MRE microcantilevers are determined by fitting the exponential decays of their deflection amplitudes with time.

Tunable surface roughness and wettability of a soft magnetoactive elastomer

“…33 A conventional polydimethylsiloxane (PDMS)-based MAE was used, which at B0 exhibits Young's modulus similar to pure PDMS (0.5 MPa). 34 They also demonstrated that magnetic field induces modifications of wetting and adhesion properties of water droplets deposited on uncured films. Different groups demonstrated magnetic control of surface wettability based on manipulation of micropillar surface structures.…”

Magneto‐mechanical properties of polydimethylsiloxane composites with a binary magnetic filler system

“…It is defined as where is the magnetic permeability of vacuum, is the saturation magnetization, denotes the mass density measured by densitometer DH‐300 (Dongguan Hongtuo Instrument Co. Ltd.). is the Young's modulus of sample, that is related to the shear modulus by , where ( =0.5) is the Poisson's ratio of the composite . Such a model is independent of the geometry of these smart materials and is more suitable for providing a set of guidelines for design of intelligent structures.…”

Magnetic Polymer Composite Particles: Design and Magnetorheology

“…Ge et al [ 107 ] developed a displacement sensor by coating a porous MR elastomer with carbon nanotubes. A tactile sensor is another type of sensing device in the field of MR elastomers, Kawasetsu et al [ 108 ] developed a flexible tactile sensor based on an MR elastomer that could detect normal forces and vertical deformation in an application as given in Figure 10 c, and Lee et al [ 109 ] developed a micro-cantilever beam with MR elastomer characteristics. More recently, Xu et al [ 110 ] used an MR elastomer as a polishing composite material to perform magnetically controlled polishing.…”