Amorphous water in three-dimensional confinement of zeolite-templated carbon

•Confined water in zeolite-templated carbon (ZTC) was studied by XRD, DSC, NMR and MD.•Water of 140wt.% is adsorbed. It is highly mobile and liquid like down to 200K.•Crossover between low-density (LD) and high-density (HD) states is discussed.•The glass transition temperature to LD amorphous (LDA)...

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Published in:Chemical physics letters 2013-05, Vol.571, p.54-60
Main Authors: Kyakuno, Haruka, Matsuda, Kazuyuki, Nakai, Yusuke, Fukuoka, Tomoko, Maniwa, Yutaka, Nishihara, Hirotomo, Kyotani, Takashi
Format: Article
Language:English
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Summary:•Confined water in zeolite-templated carbon (ZTC) was studied by XRD, DSC, NMR and MD.•Water of 140wt.% is adsorbed. It is highly mobile and liquid like down to 200K.•Crossover between low-density (LD) and high-density (HD) states is discussed.•The glass transition temperature to LD amorphous (LDA) is around 150K.•ZTC provides a new platform to study three-dimensional ‘supercooled’ water. A newly developed nano-structural material, zeolite-templated carbon (ZTC), adsorbs a large amount of water, up to 120–170wt.% with respect to the dry ZTC. Here, we investigated this nanoconfined water by several experimental methods, including specific heat and nuclear magnetic resonance measurements, and molecular dynamics simulations. The water was highly mobile down to 200K and its rotational correlation time followed an apparent non-Arrhenius behavior. With decreasing temperature, it was suggested that the water freezes into a low-density amorphous ice with a possible glass transition temperature of around 150K. ZTC provides a new platform to study three-dimensional ‘supercooled’ water.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2013.04.016