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Fabrication and Characterization of Magneto-Responsive Actuators

Author:
Reyes Kadozono, Ann
Published:
[University Park, Pennsylvania] : Pennsylvania State University, 2021.
Physical Description:
1 electronic document
Additional Creators:
Najem, Joseph and Schreyer Honors College
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Restrictions on Access:
Open Access.
Summary:
This paper presents the fabrication and characterization of a magneto-responsive actuator synthesized using PDMS as the non-magnetic polymeric matrix and iron oxide microparticles as the magnetic particle, to create a flexible composite. When the composite is exposed to an external magnetic field, it deforms and changes shape. This type of material is known as a magnetorheological elastomer, or MRE, and is an emerging smart material. Magnetorheological elastomers can change their mechanical and rheological properties when an external magnetic field is present. MREs traditionally have between 20 to 30 percent by weight (% wt.) of their particles in the non-magnetic polymeric matrix. In this research, the elastomers were developed with smaller weight percentages range from 1 to 5 % wt., . Despite their lower weight percentage, the fabricated elastomers exhibited similar actuation to an elastomer with 30 % wt. The intensity of actuation depends on many factors including concentration, type and distribution of magnetic particles, additives, type and concentration of matrix material, and magnetic field strength. In this paper, the factors investigated and studied are the concentration and distribution of magnetic particles, additives, and magnetic field strength. To test the concentration and distribution of magnetic particles, four sets of composites were developed, each having different weight percentages of iron oxide microparticles. From this, another set of composites were developed with the same weight percentages, but an additive was included to improves the dispersion of particles in the composite. Oleic acid was used as the additive to coat the particles with a non-polar layer to slow down the agglomeration of particles. After developing all the composites, experiments were designed to observe the change in actuation, by bending, which occurs when varying strengths of the magnetic field were applied. In conclusion, the addition of the oleic acid at a higher magnetic field strength caused the largest change in actuation. The 5 wt.% MRE with oleic acid demonstrated similar actuation to the MRE with 30 wt.%.
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Dissertation Note:
B.S. Pennsylvania State University 2021.
Technical Details:
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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