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Open AccessArticle

Water in Mesoporous Confinement: Glass-To-Liquid Transition or Freezing of Molecular Reorientation Dynamics?

1
Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria
2
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Takei Takahiro
Molecules 2019, 24(19), 3563; https://doi.org/10.3390/molecules24193563
Received: 29 July 2019 / Revised: 20 September 2019 / Accepted: 28 September 2019 / Published: 1 October 2019
(This article belongs to the Special Issue Advances in Porous Materials)
The first mechanical relaxation measurements (f = 400 Hz) of water confined in micro-porous silica were performed more than 40 years ago. The authors reported a so called “capillary transition” (here denoted as P3) of water in the core of the pores and a second one at a lower temperature, which they called the “adsorbate transition” (P1 in present work) related to water near the surface of the pores. The capillary transition was identified with the freezing of water in the centre of the pores. However, even 40 years later, the origin of the adsorbate transition is not yet clear. One study relates it to the liquid-to-glass transition of the supercooled water in the pores, and another study to the freezing of the proton reorientations at the lattice defects. The present work shows the data from extensive dynamic mechanical analysis (DMA) measurements (f = 0.1 Hz–70 Hz) of water confined in mesoporous silica (d = 2.5, 5 and 10 nm), which are in favour of a liquid-to-glass scenario. View Full-Text
Keywords: mesoporous silica; supercooled confined water; glass transition mesoporous silica; supercooled confined water; glass transition
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MDPI and ACS Style

Schranz, W.; Soprunyuk, V. Water in Mesoporous Confinement: Glass-To-Liquid Transition or Freezing of Molecular Reorientation Dynamics? Molecules 2019, 24, 3563.

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