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A mechanism for ageing in a deeply supercooled molecular glass

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DOI

Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films ofcis-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.

Original languageEnglish
JournalChemical Communications
Volume57
Issue52
Pages (from-to)6368-6371
Number of pages4
ISSN1359-7345
DOIs
Publication statusPublished - 4 Jul 2021

Bibliographical note

Funding Information:
AC&MRVJ thank the Danish National Research Foundation (Center for Interstellar Catalysis, DNRF150 & Center for Materials Crystallography, DNRF93, respectively) and the Danish Agency for Science, Technology, and Innovation for funding the instrument center DANSCATT. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. We thank H. Ambaye & A. C. Steffen during the preparation of the equipment for the NR experiments; and Drs M. Milas, U. Mueller and I. Kantor at the MAX IV Lab. during beam time at the BioMAX beamline.

Publisher Copyright:
© The Royal Society of Chemistry 2021.

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