Danilov, Denis ; Hahn, Horst ; Gleiter, Herbert ; Wenzel, Wolfgang (2016)
Mechanisms of Nanoglass Ultrastability.
In: ACS Nano, 10 (3)
doi: 10.1021/acsnano.5b05897
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The origin of the astonishing properties of recently discovered ultrastable nanoglasses is presently not well understood. Nanoglasses appear to exhibit density variations not common in bulk glasses and differ significantly in thermal, magnetic, biocompatible, and mechanic properties from the bulk materials of the same composition. Here, we investigate a generic model system that permits modeling of both the physical vapor deposition process (PVD) of the nanoparticles and their consolidation into a nanoglass. We performed molecular dynamics simulations to investigate the PVD process generating nanometer-sized noncrystalline clusters and the formation of the PVD-nanoglass when these nanoclusters are consolidated. In agreement with the experiments, we find that the resulting PVD-nanoglass consists of two structural components: noncrystalline nanometer-sized cores and interfacial regions that are formed during the consolidation process. The interfacial regions were found to have an atomic structure and an internal energy that differ from the structure and internal energy of the corresponding melt-quenched glass. The resulting material represents a noncrystalline state that differs from a bulk glass with the same chemical composition and a glass obtained from nanoparticles derived from the bulk glass.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Danilov, Denis ; Hahn, Horst ; Gleiter, Herbert ; Wenzel, Wolfgang |
| Art des Eintrags: | Bibliographie |
| Titel: | Mechanisms of Nanoglass Ultrastability |
| Sprache: | Englisch |
| Publikationsjahr: | 2016 |
| Verlag: | American Chemical Society, USA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Nano |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1021/acsnano.5b05897 |
| URL / URN: | https://doi.org/10.1021/acsnano.5b05897 |
| Kurzbeschreibung (Abstract): | The origin of the astonishing properties of recently discovered ultrastable nanoglasses is presently not well understood. Nanoglasses appear to exhibit density variations not common in bulk glasses and differ significantly in thermal, magnetic, biocompatible, and mechanic properties from the bulk materials of the same composition. Here, we investigate a generic model system that permits modeling of both the physical vapor deposition process (PVD) of the nanoparticles and their consolidation into a nanoglass. We performed molecular dynamics simulations to investigate the PVD process generating nanometer-sized noncrystalline clusters and the formation of the PVD-nanoglass when these nanoclusters are consolidated. In agreement with the experiments, we find that the resulting PVD-nanoglass consists of two structural components: noncrystalline nanometer-sized cores and interfacial regions that are formed during the consolidation process. The interfacial regions were found to have an atomic structure and an internal energy that differ from the structure and internal energy of the corresponding melt-quenched glass. The resulting material represents a noncrystalline state that differs from a bulk glass with the same chemical composition and a glass obtained from nanoparticles derived from the bulk glass. |
| Freie Schlagworte: | nanoglasses, physical vapor Deposition, ultrastable glasses, molecular dynamics simulations |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 27 Jul 2017 08:11 |
| Letzte Änderung: | 27 Jul 2017 08:11 |
| PPN: | |
| Sponsoren: | D.D. acknowledges support from Russian Foundation for Basic Research (RFBR Project No.14-29-10282-ofi-m)., This work was performed on the computational resource bwUniCluster funded by the Ministry of Science, Research and the Arts Baden-Wurttemberg and the Universities of the State of Baden-Wurttemberg, Germany, within the framework program bwHPC., H.H. and H.G. gratefully acknowledge the financial support by Deutsche Forschungsgemeinschaft under Grant HA 1344/30-1 within the Priority Programme SPP 1594, "Topological Engineering of Ultra-Strong Glasses". |
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