Pore-collapse in amorphous solid water: A dynamics study
Abstract
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.
Article Details
Journal Info
The Journal of Chemical Physics
American Institute of Physics
Authors (19)
Tobias Eklund
Christina M. Tonauer
Institute of Physical Chemistry, University of Innsbruck 1 , Innrain 52c, 6020 Innsbruck,
Keishiro Yamashita
Institute of Physical Chemistry, University of Innsbruck 5 , 6020 Innsbruck,
Johannes Giebelmann
Institute of Physical Chemistry, University of Innsbruck 1 , Innrain 52c, 6020 Innsbruck,
Lilli-Ruth Fidler
Institute of Physical Chemistry, University of Innsbruck 1 , Innrain 52c, 6020 Innsbruck,
Aigerim Karina
Department of Physics, Albanova University Center, Stockholm University 6 , SE-10691 Stockholm,
Hailong Li
Louisa Kraft
Institute of Physics, Johannes Gutenberg University Mainz 1 , Staudingerweg 7, 55128 Mainz,
Fiona Berner
Institute of Physics, Johannes Gutenberg University Mainz 2 , Staudingerweg 7, 55128 Mainz,
Niels C. Giesselmann
Institute of Physics, Johannes Gutenberg University Mainz 2 , Staudingerweg 7, 55128 Mainz,
Robert Bauer
Deutsches Elektronen-Synchrotron DESY 4 , Notkestraße 85, 22607 Hamburg,
Alexander Gierke
European XFEL 4 , Holzkoppel 4, 22869 Schenefeld,
Claudia Goy
Deutsches Elektronen-Synchrotron DESY 4 , Notkestraße 85, 22607 Hamburg,
Marjorie Ladd-Parada
Department of Physics, Albanova University Center, Stockholm University 6 , SE-10691 Stockholm,
Fivos Perakis
Department of Physics, AlbaNova University Center, Stockholm University
Fabian Westermeier
Deutsches Elektronen-Synchrotron DESY 5 , Notkestraße 85, 22607 Hamburg,
Felix Lehmkühler
Deutsches Elektronen-Synchrotron
Thomas Loerting
Institute of Physical Chemistry, University of Innsbruck 1 , Innrain 52c, 6020 Innsbruck,
Katrin Amann-Winkel