Pore-collapse in amorphous solid water: A dynamics study
Vapor-deposited amorphous ice, so-called amorphous solid water, exhibits complex structural and morphological transformations upon heating. A network of micropores, present at the deposition temperature (80 K), collapses at 100-145 K, and a glass transition takes place simultaneously above 120 K. Here, we separate the two processes by allowing the micropores to collapse upon heating, which is monitored by small-angle x-ray scattering experiments. The combined micropore collapse and glass transition dynamics are studied using x-ray photon correlation spectroscopy. After cooling back down and heating a second time, we see remaining pores collapsing only near Tg. Our analysis reveals both diffusive and ballistic processes attributed to pore collapse dynamics. Fast processes (∼100 Å2/s) occur only when both micropore collapse and glass transition are simultaneously at play. In other words, both processes impact on each other and lead to a speed-up. The glass transition dynamics mainly features a slow diffusive process with a diffusion coefficient of around 1 Å2/s and lower. This value is in nice agreement with other work on thin and on bulk samples.
Authors
- Claudia Goy
- Tobias Eklund (ORCID: https://orcid.org/0000-0002-5851-3939)
- Katrin Amann‐Winkel (ORCID: https://orcid.org/0000-0002-7319-7807)
- Marjorie Ladd-Parada (ORCID: https://orcid.org/0000-0003-1355-649X)
- Christina M. Tonauer (ORCID: https://orcid.org/0000-0001-6859-5344)
- Johannes Giebelmann (ORCID: https://orcid.org/0000-0003-4529-5124)
- Aigerim Karina (ORCID: https://orcid.org/0000-0003-1951-5795)
- Thomas Loerting (ORCID: https://orcid.org/0000-0001-6694-3843)
- K. Yamashita (ORCID: https://orcid.org/0000-0003-3215-3995)
- Fabian Westermeier (ORCID: https://orcid.org/0000-0003-0696-206X)
- Felix Lehmkühler (ORCID: https://orcid.org/0000-0003-1289-995X)
- Fivos Perakis (ORCID: https://orcid.org/0000-0001-9863-9811)
- F. Berner
- Alexander Gierke
- Lilli-Ruth Fidler
- Louisa Kraft
- Niels C. Gießelmann
- Robert Bauer
- Hailong Li
Institutions
- Universität Innsbruck (AT)
- Johannes Gutenberg University Mainz (DE)
- Deutsches Elektronen-Synchrotron DESY (DE)
- Max Planck Institute for Polymer Research (DE)
- AlbaNova (SE)
- KTH Royal Institute of Technology (SE)
- European X-Ray Free-Electron Laser (DE)
Publication Details
- Journal
- The Journal of Chemical Physics
- Published
- 2026-01-02
- DOI
- https://doi.org/10.1063/5.0305153
- Primary Topic
- Material Dynamics and Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Österreichischen Akademie der Wissenschaften
- Austrian Science Fund
- Deutsches Elektronen-Synchrotron
- Japan Society for the Promotion of Science