Abstract
HighlightsConfined space/water in graphene hydrogel was constructed and controlled.Adsorption capacity of porous adsorbents was enhanced by filling confined water.Incomplete hydrogen bonding in confined water contributes to adsorption.
Highlights
Water, as a major component of cells and a participant in life activities, is simple but crucial for all living things
The qualitative and quantitative analyses of the confined water revealed that the confined water content and hydrogen bonding structure were regulated with the variation in confined space
The fitting results showed that the specific surface area (SSA) of micropores and oxygen contents both contributed to the confined water content
Summary
As a major component of cells and a participant in life activities, is simple but crucial for all living things. Confined water generally refers to liquid water held within nanometer-sized vessels It is found widespread in granular and porous materials, around and within cells, macromolecules, supramolecular structures, and gels [3]. Wu et al trapped water in graphene sheets and found that the nano-confined water formed 2D square ice at room temperature This is a new symmetric water phase in which the hydrogen bonding is qualitatively different from the conventional tetrahedral coordination between water molecules [11]. Radha et al fabricated 2D graphene capillaries and found that water transport through channels increased unexpectedly (up to 1 m s−1), which was attributed to high capillary pressures (approximately 1000 bar) and large slip lengths [12] These extraordinary structures and properties endow it with the potential for applications in separation, nanochannel and nanofluidic devices, and desalination [13,14,15]
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