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Title: Phase transitions of ordered ice in graphene nanocapillaries and carbon nanotubes

Journal Article · · Scientific Reports

New phase diagrams for water confined in graphene nanocapillaries and single-walled carbon nanotubes (CNTs) are proposed, identifying ice structures, their melting points and revealing the presence of a solid-liquid critical point. For quasi-2D water in nanocapillaries, we show through molecular-dynamics simulations that AA stacking in multilayer quasi-2D ice arises from interlayer hydrogen-bonding and is stable up to three layers, thereby explaining recent experimental observations. Detailed structural and energetic analyses show that quasi-2D water can freeze discontinuously through a first-order phase transition or continuously with a critical point. The first-order transition line extends to a continuous transition line, defined by a sharp transition in diffusivity between solid-like and liquid-like regimes. For quasi-1D water, confined in CNTs, we observe the existence of a similar critical point at intermediate densities. In addition, an end point is identified on the continuous-transition line, above which the solid and liquid phases deform continuously. The solid-liquid phase transition temperatures in CNTs are shown to be substantially higher than 273 K, confirming recent Raman spectroscopy measurements. In conclusion, we observe ultrafast proton and hydroxyl transport in quasi-1D and -2D ice at 300 K, exceeding those of bulk water up to a factor of five, thereby providing possible applications to fuel-cells and electrolyzers.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1480603
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (9)

A general topological network criterion for exploring the structure of icy nanoribbons and monolayers journal January 2020
Molecular dynamics simulations of Lennard-Jones systems confined between suspended nanoscale graphene sheets journal February 2019
Study of ice nucleation on silver iodide surface with defects text January 2019
Study of ice nucleation on silver iodide surface with defects text January 2019
Study of ice nucleation on silver iodide surface with defects text January 2019
Study of ice nucleation on silver iodide surface with defects text January 2019
Fluidity and phase transitions of water in hydrophobic and hydrophilic nanotubes journal April 2019
A General Topological Network Criterion for Exploring the Structure of Icy Nanoribbons and Monolayers text January 2019
Hybrid continuum-molecular modeling of fluid slip flow text January 2020

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