Measuring the deformation of a ferrogel sphere in a homogeneous magnetic field

Abstract

A sphere of a ferrogel is exposed to a homogeneous magnetic field. In accordance to theoretical predictions, it gets elongated along the field lines. The time-dependence of the elastic shear modulus causes the elongation to increase with time analogously to mechanic creep experiments, and the rapid excitation causes the sphere to vibrate. Both phenomena can be well described by a damped harmonic oscillator model. By comparing the elongation along the field with the contraction perpendicular to it, we can calculate Poisson's ratio of the gel. The magnitude of the elongation is compared with the theoretical predictions for elastic spheres in homogeneous fields.

5 pages, 8 figures

References in corpus (1)

• Strong dipolar effects in a quantum ferrofluid

Cited by in corpus (7)

• Magneto-sensitive elastomers in a homogeneous magnetic field: a regular rectangular lattice model
• Magnetostriction in magnetic gels and elastomers as a function of the internal structure and particle distribution
• Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study
• Magnetically induced elastic deformations of magnetic gels and elastomers containing particles of mixed size
• Magnetic elastomers as specific soft actuators -- predicting particular modes of deformation from selected configurations of magnetizable inclusions
• Stimuli-responsive twist actuators made from soft elastic composite materials -- linking mesoscopic and macroscopic descriptions
• Density functional approach to elastic properties of three-dimensional dipole-spring models for magnetic gels