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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > January  >
In the Laboratory
A Surface Chemistry Experiment Using an Inexpensive Contact Angle Goniometer
Madalena Dionísio and João Sotomayor
Departamento de Química, Universidade Nova de Lisboa, Quinta da Torre, 2825 Monte de Caparica, Portugal
Cover
January 2000
Vol. 77 No. 1
p. 59
Abstract
The first part of this work presents the construction of an inexpensive and easy to handle contact angle goniometer. The instrument provides contact angles that are within ±2° of the values obtained by a commercial apparatus and are in good agreement with values reported in the literature. In the second part of this work, the contact angle method is used to measure the critical micelle concentration (cmc) of two common surfactants in aqueous solutions: SDS (sodium dodecylsulfate) and Triton X-100 ([polyoxyethyleneglycol]9-10 p-tert-octyl phenol). The cmc values obtained by the contact angle method are consistent with those reported in literature and also with those obtained by surface tension measurements using a simplified Du Nüoy tensiometer.
Supplement
A lab summary, experimental procedure, instructorÕs notes, and figures are provided.
*  Contents JCE2000p0059W.doc (Microsoft Word)
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*  Citation
 Dion’sio, Madalena; Sotomayor, Jo‹o. J. Chem. Educ. 2000 77 59.
*  Keywords
 Laboratory Equipment / Apparatus; Micelles; Physical Chemistry; Surface Science
*  History
 Created:
Last Updated:		 December 9, 1999
August 31, 2005
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