Electrorheological  Liquid



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 Code Number :   5B10.45?

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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Condition :   Good  
Principle :   Electrostatic effects on fluidic polymers
Area of Study :  Electricity & Magnetism   
Equipment :   Vegetable Oil and Corn Starch

  
Procedure :   Mix 1 part corn starch to 2 parts vegetable (Wesson) oil.  Pour the resulting mixture into another container and while pouring bring a charged PVC rod near the stream.  If the mixture is of proper consistency it will stop pouring and appear to freeze or turn solid.  Moving the rod away from the stream will allow it to continue pouring again as a normal liquid. 
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   References

David Haase, "Electrorheological Liquids", TPT, Vol. 31, # 4, Apr. 1993, p. 218.

 

Christopher P. Jargodzki and Franklin Potter, Mad About Physics: #128, "Strange Behavior of a Mixture,"  p. 48, 190

"An Electrostatic 'Slime'," Physics From the Junk Drawer, 3rd Edition, The Science House, North Carolina State University, p. 32.



Mail Questions and Comments to:  Dale Stille