Mobilization upon cooling

  • Phase transitions between different aggregate states are omnipresent in nature and technology. Conventionally, a crystalline phase melts upon heating as we use ice to cool a drink. Already in 1903, Gustav Tammann speculated about the opposite process, namely melting upon cooling. So far, evidence for such “inverse” transitions in real materials is rare and limited to few systems or extreme conditions. Here, we demonstrate an inverse phase transition for molecules adsorbed on a surface. Molybdenum tetraacetate on copper(111) forms an ordered structure at room temperature, which dissolves upon cooling. This transition is mediated by molecules becoming mobile, i.e., by mobilization upon cooling. This unexpected phenomenon is ascribed to the larger number of internal degrees of freedom in the ordered phase compared to the mobile phase at low temperatures.

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Metadaten
Author:Simon Aeschlimann, Lu Lyu, Sebastian Becker, Sina Mousavion, Thomas Speck, Hans‐Joachim Elmers, Benjamin StadtmüllerGND, Martin Aeschlimann, Ralf Bechstein, Angelika Kühnle
URN:urn:nbn:de:bvb:384-opus4-1129850
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/112985
ISSN:1433-7851OPAC
ISSN:1521-3773OPAC
Parent Title (German):Angewandte Chemie International Edition
Publisher:Wiley
Type:Article
Language:English
Year of first Publication:2021
Publishing Institution:Universität Augsburg
Release Date:2024/05/14
Volume:60
Issue:35
First Page:19117
Last Page:19122
DOI:https://doi.org/10.1002/anie.202105100
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik II
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):CC-BY-NC-ND 4.0: Creative Commons: Namensnennung - Nicht kommerziell - Keine Bearbeitung (mit Print on Demand)