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| Home > JCE Print > Journal of Chemical Education > Issues >
1999
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September
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Chemistry Everyday for Everyone
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Chemistry with Refrigerator Magnets: From Modeling of Nanoscale Characterization to Composite Fabrication
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Dean J. Campbell
Department of Chemistry, Bradley University, Peoria, IL 61625
Joel A. Olson, Camilo E. Calderon, Patrick W. Doolan, Elizabeth A. Mengelt, and Arthur B. Ellis
Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706
George C. Lisensky
Department of Chemistry, Beloit College, Beloit, WI 53511
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September 1999
Vol. 76 No. 9
p. 1205
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| Abstract |
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Flexible sheet refrigerator magnets (RMs) have interesting magnetic structures that allow them to be used to demonstrate a number of chemical principles. RMs are a composite of strontium ferrite dispersed in the elastomer Hypalon. The magnetic alignment of the ferrite particles gives rise to a striped array of alternating north and south poles on the back side of the RM that may be visualized by a number of techniques and altered with a strong magnet. When the back sides of two RMs are rubbed against each other, the magnets may slide or alternately attract and repel one another ("chatter"), depending on their relative orientation. These effects lend themselves to demonstrations of scanning probe microscopy and models of mechanical properties of metals and salts. Concepts of composite materials and surface chemistry may be illustrated with student laboratory fabrications of refrigerator magnets utilizing strontium ferrite dispersed in polydimethylsiloxane elastomer.
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| Supplement |
Supplementary material provided is in the form of a Microsoft Word 6.0 document which contains Notes for Instructors and detailed experimental information titled "Composites and Surfaces". They have been compressed as zip (for Windows) and sit (for Macintosh) files. They can also be accessed as a pdf file using Acrobat Reader.
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| More Information |
Citation |
Campbell, Dean J.; Olson, Joel A.; Calderon, Camilo E.; Doolan, Patrick W.; Mengelt, Elizabeth A.; Ellis, Arthur B.; Lisensky, George C. J. Chem. Educ. 1999 76 1205.
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Keywords |
Demonstrations; General Chemistry; Magnetic Properties; Materials Science; Surface Science; Nanotechnology
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History |
Created:
Last Updated: |
July 30, 1999
November 22, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1999
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September
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1205
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