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| Home > JCE Print > Journal of Chemical Education > Issues >
2001
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March
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In the Classroom
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Tested Demonstrations
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Enchanted Glass
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Sándor Szabó L.
Chemical Research Center, Hungarian Academy of Sciences, POB 17, H-1525 Budapest, Hungary
Károly Mazák
Institute of Pharmaceutical Chemistry, Semmelweis University, H-1092 Budapest, Hungary
Dezsö Knausz
Department of General and Inorganic Chemistry, L. Eötvös University, H-1117 Budapest, Hungary
Márta Rózsahegyi
Department of Inorganic and Analytical Chemistry, L. Eötvös University, Pázmány s. 1/a, H-1117 Budapest, Hungary
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March 2001
Vol. 78 No. 3
p. 329
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| Abstract |
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These experiments present the "hydrophobizing" and organophilic properties of silicones. The method is to make hydrophobic the polar, hydrophilic surface of glass by silylating the surface of various glass objects with trimethylsilyl N,N-dimethylcarbamate. The process of activating and silylating glass beads, capillaries, beakers, and glass sheets is described. Classroom demonstrations are presented on the different behaviors of the silylated and simply activated surfaces of these glass objects interacting with distilled water, and in the case of capillaries, also with hexane and ethanol. Spherical water drops can be observed on the hydrophobic microscope slide. Silylated glass beads float on the surface of water, displaying different patterns. They also remove oil contamination from the surface of water. The capillaries show different capillary action toward water and hexane. These experiments can enrich the coverage of silicon compounds in the classroom and make them more familiar to children.
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| More Information |
 Citation |
Szabó L., Sándor; Mazák, Károly; Knausz, Dezsö; Rózsahegyi, Márta. J. Chem. Educ. 2001 78 329.
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Keywords |
Demonstrations; Intermolecular Forces; Organometallics; Physical Chemistry; Silicon Compounds; Surface Science
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History |
Created:
Last Updated: |
February 6, 2001
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2001
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March
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329
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