Use of Simplified Surface Tension Measurements To Determine Surface Excess: An Undergraduate Experiment
| Autor: | Michael G. Antoniades, Katherine N. Gascon, Steven J. Weinstein |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Aqueous solution 010405 organic chemistry education 05 social sciences 050301 education Thermodynamics General Chemistry 01 natural sciences Micelle 0104 chemical sciences Education Surface tension symbols.namesake chemistry.chemical_compound Adsorption Gibbs isotherm chemistry Pulmonary surfactant Critical micelle concentration symbols Sodium dodecyl sulfate 0503 education |
| Zdroj: | Journal of Chemical Education. 96:342-347 |
| ISSN: | 1938-1328 0021-9584 |
| Popis: | The effect of surfactant adsorption on surface tension, as well as associated thermodynamic concepts are introduced in a laboratory experiment designed for undergraduate students. Using a reliable and accessible method, students measure the surface tension of aqueous solutions at different concentrations of sodium dodecyl sulfate. Students collect data to estimate the critical micelle concentration and quantitatively determine the maximum surface excess using the Gibbs adsorption equation. Students subsequently determine the surface area per molecule of this surfactant at the liquid–air interface and learn how to generate adsorption isotherm curves. |
| Databáze: | OpenAIRE |
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