Pore-collapse in amorphous solid water: A dynamics study
Eklund, Tobias (författare)
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany; European XFEL, Holzkoppel 4 22869, Schenefeld, Germany
Tonauer, Christina M. (författare)
Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany; Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
Yamashita, Keishiro (författare)
Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
Fidler, Lilli Ruth (författare)
Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
Karina, Aigerim, 1996- (författare)
Stockholms universitet,Fysikum,Department of Physics, Albanova University Center, Stockholm University, SE-10691 Stockholm, Sweden
Li, Hailong (författare)
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
Kraft, Louisa (författare)
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
Berner, Fiona (författare)
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
Gießelmann, Niels C. (författare)
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany; Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
Stockholms universitet,KTH,Glykovetenskap,Department of Physics, Albanova University Center, Stockholm University, SE-10691 Stockholm, Sweden,Fysikum,KTH Royal Institute of Technology, Sweden
Perakis, Fivos (författare)
Department of Physics, Albanova University Center, Stockholm University, SE-10691 Stockholm, Sweden
Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
Amann-Winkel, Katrin (författare)
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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.
Ämnesord
NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)