How water desorbs from calcite
| Autor: | Tobias Dickbreder, Dirk Lautner, Antonia Köhler, Lea Klausfering, Ralf Bechstein, Angelika Kühnle |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Chemistry Chemical Physics. 25:12694-12701 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Calcite is the most abundant carbonate mineral in Earth's crust. Upon cleavage, the (10.4) plane with a rectangular unit cell is exposed. Interestingly, several experiments suggest a (2 * 1) surface reconstruction. However, clear experimental evidence and a theoretical confirmation were long missing. Recently, convincing indication for a (2 * 1) reconstruction has been given by atomic force microscopies taken at 5 K. Here, we show temperature-programmed desorption (TPD) experiments of water and ethanol desorbing from calcite (10.4) around room temperature. The TPD curves fit excellently to a kinetic model considering two different adsorption sites, as expected in case of a (2 * 1) reconstruction. This finding applies to the desorption of water and ethanol, illustrating that the effect is characteristic for the calcite cleavage plane. Our results thus show that the (2 * 1) reconstruction not only exists at room temperature but has significant impact on the interfacial properties of calcite. |
| Databáze: | OpenAIRE |
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