Tribonucleation: A New Mechanism for Generating the Soda Geyser

• Autores: Thomas S. Kuntzleman, Michael W. Nydegger, Brooke Shadley, Ninad Doctor, Dean J. Campbell
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 95, Nº 8, 2018, págs. 1345-1349
• Idioma: inglés
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• Resumen

  • Observations of the rapid release of CO2 from carbonated beverages, also known as sodas, provide a rich assortment of experiments for chemical educators and their students to explore. For example, dropping Mentos candies into a freshly opened bottle of soda creates a fountain that can jet several meters into the air. The fountain is generated by rapid formation of CO2(g) bubbles on innumerable nucleation sites that exist on the rough surface of the candies. Interestingly, it is possible to create fountains of moderate height by dropping smooth objects into bottles of soda. Exploration of how smooth objects create such fountains provides new classroom demonstrations, laboratory experiments, and inquiry-based projects that can be tied to topics that include kinetics, density, and gas solubility.