- In recent years, we have come to appreciate the astounding intricacies associated with the formation of minerals from ions in aqueous solutions. In this context, a number of studies have revealed that the nucleation of calcium sulfate systems occurs nonclassically, involving the aggregation and reorganization of nanosized prenucleation species. In recent work, we have shown that this particle-mediated nucleation pathway is actually imprinted in the resultant micrometer-sized CaSO4 crystals. This property of CaSO4 minerals provides us with the unique opportunity to search for evidence of nonclassical nucleation pathways in geological environments.
In particular, we focused on large anhydrite Crystals extracted from the Naica Mine in Mexico. We were able to shed light on this mineral's growth history by mapping defects at different length scales. Based on this, we argue that the nanoscale misalignment of the structural subunits, observed in the initial calcium sulfate crystal seeds,In recent years, we have come to appreciate the astounding intricacies associated with the formation of minerals from ions in aqueous solutions. In this context, a number of studies have revealed that the nucleation of calcium sulfate systems occurs nonclassically, involving the aggregation and reorganization of nanosized prenucleation species. In recent work, we have shown that this particle-mediated nucleation pathway is actually imprinted in the resultant micrometer-sized CaSO4 crystals. This property of CaSO4 minerals provides us with the unique opportunity to search for evidence of nonclassical nucleation pathways in geological environments.
In particular, we focused on large anhydrite Crystals extracted from the Naica Mine in Mexico. We were able to shed light on this mineral's growth history by mapping defects at different length scales. Based on this, we argue that the nanoscale misalignment of the structural subunits, observed in the initial calcium sulfate crystal seeds, propagates through different length scales both in morphological, as well as in strictly crystallographic aspects, eventually causing the formation of large mesostructured single crystals of anhydrite. Hence, the nonclassical nucleation mechanism introduces a “seed of imperfection,” which leads to a macroscopic “single” crystal whose fragments do not fit together at different length scales in a self-similar manner. Consequently, anisotropic voids of various sizes are formed with very welldefined walls/edges. However, at the same time, the material retains in part its single crystal nature.…
MetadatenAutor*innen: | Tomasz StawskiORCiD, Glen Jacob SmalesORCiD, E. ScoppolaORCiD, D. Jha, L. F. G. MoralesORCiD, A. MoyaORCiD, R. Wirth, Brian Richard PauwORCiD, Franziska EmmerlingORCiD, A. E. S. Van DriesscheORCiD |
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Dokumenttyp: | Zeitschriftenartikel |
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Veröffentlichungsform: | Verlagsliteratur |
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Sprache: | Englisch |
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Titel des übergeordneten Werkes (Englisch): | Proceedings of the National Academy of Sciences of the United States of America (PNAS) |
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Jahr der Erstveröffentlichung: | 2021 |
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Organisationseinheit der BAM: | 6 Materialchemie |
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| 6 Materialchemie / 6.3 Strukturanalytik |
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| 6 Materialchemie / 6.5 Synthese und Streuverfahren nanostrukturierter Materialien |
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Verlag: | National Academy of Sciences (USA) |
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Verlagsort: | Washington |
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Jahrgang/Band: | 118 |
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Ausgabe/Heft: | 48 |
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Aufsatznummer: | e2111213118 |
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Erste Seite: | 1 |
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Letzte Seite: | 11 |
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DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
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| Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
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Freie Schlagwörter: | Anhydrite; Calcium sulfate; Mesocrystal; Naica; Nucleation |
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Themenfelder/Aktivitätsfelder der BAM: | Chemie und Prozesstechnik |
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| Material |
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| Material / Materialdesign |
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| Material / Nano |
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DOI: | 10.1073/pnas.2111213118 |
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ISSN: | 0027-8424 |
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Zugehöriger Identifikator: | https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/53630 |
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Zugehöriger Identifikator: | https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/53765 |
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Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
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Datum der Freischaltung: | 25.11.2021 |
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Referierte Publikation: | Ja |
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Datum der Eintragung als referierte Publikation: | 29.11.2021 |
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