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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Magnetically Tunable Vibration Transmissibility for Polyurethane Magnetic Elastomers.

Hiroyuki Endo1,2, Shunsuke Kato3,4, Mayuko Watanebe5

  • 1Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan. f16b003c@mail.cc.niigata-u.ac.jp.

Polymers
|April 11, 2019
PubMed
Summary

Magnetic elastomers show increased natural frequency in a weak magnetic field, but vibration transmissibility remains unaffected. This magnetic effect on elastomers is linked to their storage modulus and mass, behaving as simple harmonic oscillation.

Keywords:
magnetic elastomermagnetic gelmagnetorheological effectsoft materialstimuli-responsive material

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Vibration Analysis

Background:

  • Magnetic elastomers are advanced materials with tunable properties.
  • Understanding their dynamic behavior under external stimuli is crucial for applications.
  • Previous studies have explored magnetic field effects on elastomer properties.

Purpose of the Study:

  • To investigate the influence of a weak magnetic field on the vibration transmissibility of magnetic elastomers.
  • To analyze how varying magnetic particle volume fractions affect elastomer dynamics.
  • To establish the relationship between natural frequency, storage modulus, and mass.

Main Methods:

  • Experimental testing of polyurethane elastomers with different magnetic particle concentrations.
  • Measurement of natural frequency and vibration transmissibility under varying magnetic fields (up to 60 mT).
  • Analysis of the relationship between natural frequency and the square root of the storage modulus to mass ratio.

Main Results:

  • Polyurethane elastomers without magnetic particles had a natural frequency of 53 Hz and were unaffected by a 60 mT magnetic field.
  • Magnetic elastomers with 0.23 volume fraction showed a natural frequency increase from 115 Hz (0 mT) to 134 Hz (60 mT).
  • Vibration transmissibility was found to be independent of the applied magnetic field strength.

Conclusions:

  • A weak magnetic field can alter the natural frequency of magnetic elastomers.
  • The observed vibration behavior aligns with simple harmonic oscillation principles.
  • The study highlights the potential for magnetic field control over elastomer dynamics, though transmissibility is unaffected.