Nanoconfinement effects on water in narrow graphene-based slit pores as revealed by THz spectroscopy
The properties of water at interfaces have long been known to differ from those of bulk water in many distinctive ways. More recently, specific confinement effects different from mere interfacial effects have been discovered upon enclosing water in very narrow cylindrical pores and planar surfaces a...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/407174 |
| Acceso en línea: | https://hdl.handle.net/2117/407174 https://dx.doi.org/10.1039/D2CP02564G |
| Access Level: | acceso abierto |
| Palabra clave: | Spectrum analysis Molecular dynamics Water Anàlisi espectral Dinàmica molecular Aigua Confinament Àrees temàtiques de la UPC::Física::Física molecular |
| Sumario: | The properties of water at interfaces have long been known to differ from those of bulk water in many distinctive ways. More recently, specific confinement effects different from mere interfacial effects have been discovered upon enclosing water in very narrow cylindrical pores and planar surfaces as offered by nanotubes and slit pores, respectively. Using experimental and theoretical THz spectroscopy, we elucidate nanoconfinement effects on the H-bond network of stratified water lamellae that are hosted within graphene-based two-dimensional pores. Characteristic confinement-induced changes of the THz response are traced back to the level of structural dynamics, notably distinct resonances due to intralayer and interlayer H-bonds at correspondingly low and high intermolecular stretching frequencies and impact of dangling (free) OH bonds at the water–graphene interface that enormously broaden the librational band in sufficiently narrow pores. The interplay of these molecular effects causes characteristic changes of the THz lineshape upon nanoconfining water. |
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