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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > March  >
In the Classroom
Tested Demonstrations
Are Surfactant Molecules Really Oriented in the Interface?
Nasimul Gani
Jodhpur Park Boys' School, Kolkata 700 068, India

Jasmina Khanam
Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700 032, India

checked by:
Joe Franek
Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431

Jim Konzelman
Department of Chemistry, Gainesville College, Gainesville, FL 30503
Cover
March 2002
Vol. 79 No. 3
p. 332
Abstract
In aqueous medium, cetyltrimethylammonium bromide reacts with potassium hexacyanoferrate(III) and forms a precipitate by an ion-exchange reaction. But a bubble blown from an aqueous solution of polyoxyethylene sorbitan monooleate (Tween 80) and cetyltrimethylammonium bromide does not form a precipitate when floated on the surface of a potassium hexacyanoferrate(III) solution, as long as the bubble remains intact. This event is an example of definite orientation of cetyltrimethylammonium bromide molecules (surfactants) in the bubble interfaces.
More Information
*  Citation
 Gani, Nasimul; Khanam, Jasmina. J. Chem. Educ. 2002 79 332.
*  Keywords
 Consumer Chemistry; Demonstrations; Introductory / High School Chemistry; Surface Science
*  History
 Created:
Last Updated:		 January 31, 2002
March 16, 2005
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