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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > June  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Surface Tension Gradients Induced by Temperature: The Thermal Marangoni Effect
Marcos Gugliotti, Mauricio S. Baptista, and Mario J. Politi
Instituto de Quimica, Universidade de São Paulo, CEP: 05508-900 São Paulo, Brazil

checked by:

Todd P. Silverstein
Department of Chemistry, Willamette University, Salem, OR 97301-3922

Carl D. Slater
Department of Chemistry, Michigan State University, East Lansing, MI 48824

Cover
June 2004
Vol. 81 No. 6
p. 824
Abstract
This article presents a simple experiment to demonstrate the motion of liquids induced by surface tension gradients generated by local heating. Changes in temperature are produced by bringing a heat source (soldering iron) close to a thin liquid film in a Petri dish, where the motions are easily observable owing to the rupture of the film. The experiment is easy to perform, and the visualization of the effect can facilitate the introduction of surface tension gradients. The use of other heat sources and some of the possible variations of this experiment are also mentioned.
More Information
*  Citation
 Gugliotti, Marcos; Baptista, Mauricio S.; Politi, Mario J. J. Chem. Educ. 2004 81 824.
*  Keywords
 Demonstrations; Lasers / Laser Spectroscopy; Liquids; Surface Science; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 May 2, 2004
January 21, 2005
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