Anomalous Freezing of Low Dimensional Water Confined in Graphene Nanowrinkles
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arXiv
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| Format: | Preprint |
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2021
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| author | Verhagen, Tim Klimes, Jiri Pacakova, Barbara Kalbac, Martin Vejpravova, Jana |
| author_facet | Verhagen, Tim Klimes, Jiri Pacakova, Barbara Kalbac, Martin Vejpravova, Jana |
| contents | Various properties of water are affected by confinement as the space-filling of the water molecules is very different from bulk water. In our study, we challenged the creation of a stable system in which water molecules are permanently locked in nanodimensional graphene traps. For that purpose, we developed a technique, nitrocellulose-assisted transfer of graphene grown by chemical vapor deposition, which enables capturing of the water molecules below an atomically thin graphene membrane structured into a net of regular wrinkles with a lateral dimension of about 4 nm. After successfully confining water molecules below a graphene monolayer, we employed cryogenic Raman spectroscopy to monitor the phase changes of the confined water as a function of the temperature. In our experiment system, the graphene monolayer structured into a net of fine wrinkles plays a dual role: (i) it enables water confinement and (ii) serves as an extremely sensitive probe for phase transitions involving water via graphene-based spectroscopic monitoring of the underlying water structure. Experimental findings were supported with classical and path integral molecular dynamics simulations carried out on our experimental system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2102_03171 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Anomalous Freezing of Low Dimensional Water Confined in Graphene Nanowrinkles Verhagen, Tim Klimes, Jiri Pacakova, Barbara Kalbac, Martin Vejpravova, Jana Mesoscale and Nanoscale Physics Various properties of water are affected by confinement as the space-filling of the water molecules is very different from bulk water. In our study, we challenged the creation of a stable system in which water molecules are permanently locked in nanodimensional graphene traps. For that purpose, we developed a technique, nitrocellulose-assisted transfer of graphene grown by chemical vapor deposition, which enables capturing of the water molecules below an atomically thin graphene membrane structured into a net of regular wrinkles with a lateral dimension of about 4 nm. After successfully confining water molecules below a graphene monolayer, we employed cryogenic Raman spectroscopy to monitor the phase changes of the confined water as a function of the temperature. In our experiment system, the graphene monolayer structured into a net of fine wrinkles plays a dual role: (i) it enables water confinement and (ii) serves as an extremely sensitive probe for phase transitions involving water via graphene-based spectroscopic monitoring of the underlying water structure. Experimental findings were supported with classical and path integral molecular dynamics simulations carried out on our experimental system. |
| title | Anomalous Freezing of Low Dimensional Water Confined in Graphene Nanowrinkles |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2102.03171 |