Abstract
Polyacrylamide ferrogels with embedded nickel magnetic nanoparticles were synthesized by radical polymerization in water. The elastic modulus of ferrogels was measured under unidirectional compression in a uniform magnetic field with a strength of 0, 165, 220 and 275 Oe. With an increase in the content of nickel particles in ferrogel from 0 to 5.3% by weight, the elastic modulus in zero magnetic field increased by 60%. The application of magnetic field parallel to the direction of compression resulted in the increase of modulus, and if the field was applied perpendicular to the compression, the modulus tends to decrease. Such trends are in good agreement with the features of magnetostriction of a non-compressible uniformly magnetized sphere in a constant magnetic field.
Highlights
One of the challenging tasks of today’s material science is the growing demand for “smart” materials, which term essentially means that a material can mechanically respond to certain external stimuli
Polyacrylamide ferrogels with embedded nickel magnetic nanoparticles were synthesized by radical polymerization in water
In the range of compression deformation from 0 to 10%, the experimental data are fitted well by linear function =103*, which made it possible to calculate the elastic modulus of the ferrogel as the slope of the plot
Summary
One of the challenging tasks of today’s material science is the growing demand for “smart” materials, which term essentially means that a material can mechanically respond to certain external stimuli. It relates to volume changes, shape distortion, force generation etc. Under the controlled variation of external parameters Such variations may be of thermodynamic, chemical, electrical, and magnetic origin [1,2]. Much attention is paid to the development of “smart” magnetic materials for actuators, sensors, drug delivery, MRI and hyperthermia agents due to the prospect of their contactless deformation under the influence of a magnetic field, which opens up wide possibilities for their application [3,4,5]
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