A mechanism for ageing in a deeply supercooled molecular glass

Andrew Cassidy; Mads R. V. Jørgensen; Artur Glavic; Valeria Lauter; Oksana Plekan; David Field

doi:10.1039/D1CC01639C

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A mechanism for ageing in a deeply supercooled molecular glass†

Andrew Cassidy,

*^a Mads R. V. Jørgensen,

^b Artur Glavic,

^c Valeria Lauter,

*^d Oksana Plekan

^e and David Field

Author affiliations

* Corresponding authors

^a Center for Interstellar Catalysis and Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, Denmark
E-mail: amc@phys.au.dk

^b Center for Materials Crystallography, iNano & Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus C, Denmark & MAX IV Laboratory, Lund University, Fotongatan 2, Lund, Sweden

^c Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, 5231 Villigen PSI, Switzerland

^d Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
E-mail: lauterv@ornl.gov

^e Sincrotrone Trieste S.C.p.A., Area Science Park, Strada Statale 14, km 163.5, I-34149 Basovizza, Trieste, Italy

Abstract

Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films of cis-methyl formate, provide the first direct assessment of the energy barrier to secondary relaxation in a molecular glass. At temperatures far below the glass transition temperature, the mechanism of relaxation is shown to be through hindered molecular rotation. Magnetically-polarised neutron scattering experiments exclude diffusion, which is demonstrated to take place only close to the glass transition temperature.

This article is part of the themed collection: 2021 Emerging Investigators

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Article information

DOI: https://doi.org/10.1039/D1CC01639C
Article type: Communication
Submitted: 26 Mar 2021
Accepted: 19 May 2021
First published: 21 May 2021
This article is Open Access

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Chem. Commun., 2021,57, 6368-6371

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A mechanism for ageing in a deeply supercooled molecular glass

A. Cassidy, M. R. V. Jørgensen, A. Glavic, V. Lauter, O. Plekan and D. Field, Chem. Commun., 2021, 57, 6368 DOI: 10.1039/D1CC01639C

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Chemical Communications

A mechanism for ageing in a deeply supercooled molecular glass†

Abstract

Supplementary files

Article information

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A mechanism for ageing in a deeply supercooled molecular glass

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