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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Confined Water: Structure, Dynamics, and Thermodynamics.

Sudip Chakraborty1, Hemant Kumar2, Chandan Dasgupta2

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Strongly confined water in carbon nanotubes (CNTs) and graphene oxide (GO) exhibits unique solid-like ordering and Fickian diffusion due to hydrogen bonding. This confinement alters orientational dynamics, with some aspects speeding up significantly compared to bulk water.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Water's bulk properties stem from hydrogen bonds.
  • Strong confinement modifies water's structure, thermodynamics, and dynamics.
  • Confined water is crucial for biological processes and nanofluidic devices.

Purpose of the Study:

  • To overview water behavior in carbon nanotubes (CNTs) and graphene oxide (GO) slit pores.
  • To investigate the impact of confinement on water's structural and dynamic properties.
  • To compare simulation results from different water models.

Main Methods:

  • Molecular dynamics simulations.
  • Analytic calculations.
  • Analysis of orientational relaxation dynamics.

Main Results:

  • Water in narrow CNTs forms solid-like, single-file arrangements.
  • Confined water in CNTs exhibits Fickian diffusion due to collective motion.
  • Orientational relaxation shows anisotropy, with some dynamics speeding up.
  • Water entry into CNTs is driven by increased rotational entropy.
  • Water in GO slit pores shows distinct dry and hydrated cavity regimes.

Conclusions:

  • Confinement dramatically alters water's hydrogen bond network and properties.
  • Fickian diffusion in confined water is possible through collective motion.
  • Orientational dynamics exhibit complex, confinement-induced changes.
  • Water models like SPC/E accurately predict confined water behavior.
  • GO membranes offer tunable permeation pathways for water.