Glaab, Fabian and Rieder, Julian and Klein, Regina and Choquesillo-Lazarte, Duane and Melero-Garcia, Emilio and Garcia-Ruiz, Juan-Manuel and Kunz, Werner and Kellermeier, Matthias (2017) Precipitation and Crystallization Kinetics in Silica Gardens. CHEMPHYSCHEM, 18 (4). pp. 338-345. ISSN 1439-4235, 1439-7641
Full text not available from this repository. (Request a copy)Abstract
Silica gardens are extraordinary plant-like structures resulting from the complex interplay of relatively simple inorganic components. Recent work has highlighted that macroscopic self-assembly is accompanied by the spontaneous formation of considerable chemical gradients, which induce a cascade of coupled dissolution, diffusion, and precipitation processes occurring over timescales as long as several days. In the present study, this dynamic behavior was investigated for silica gardens based on iron and cobalt chloride by means of two synchrotron- based techniques, which allow the determination of concentration profiles and time-resolved monitoring of diffraction patterns, thus giving direct insight into the progress of dissolution and crystallization phenomena in the system. On the basis of the collected data, a kinetic model is proposed to describe the relevant reactions on a fundamental physicochemical level. The results show that the choice of the metal cations (as well as their counterions) is crucial for the development of silica gardens in both the short and long term (i. e. during tube formation and upon subsequent slow equilibration), and provide important clues for understanding the properties of related structures in geochemical and industrial environments.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHEMICAL GARDENS; CALCIUM-CARBONATE; GROWTH; TUBES; kinetics; self-assembly; silica gardens; X-ray absorption spectroscopy; X-ray diffraction |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 11 Feb 2019 12:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/433 |
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