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Transport of Surface-modified Carbon Nanotubes through a Soil Column
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Published on: April 2, 2015

How fast does water flow in carbon nanotubes?

Sridhar Kumar Kannam1, B D Todd, J S Hansen

  • 1Mathematics Discipline, Faculty of Engineering and Industrial Science, and Centre for Molecular Simulation, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. urssrisri@gmail.com

The Journal of Chemical Physics
|March 15, 2013
PubMed
Summary

Water flow in carbon nanotubes shows highly variable slip lengths. This study precisely computes slip length using molecular dynamics simulations, resolving discrepancies in previous research on water-carbon nanotube interactions.

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Area of Science:

  • Fluid dynamics
  • Nanotechnology
  • Computational chemistry

Background:

  • Water flow in carbon nanotubes is crucial for nanotechnology applications.
  • Existing data on slip length, a key flow parameter, varies widely (5 orders of magnitude) for nanotube diameters from 0.81-10 nm.

Purpose of the Study:

  • To review existing literature on water flow rates in carbon nanotubes.
  • To precisely compute slip length using molecular dynamics simulations.
  • To identify and address reasons for discrepancies in reported slip length data.

Main Methods:

  • Literature review of water flow rates in carbon nanotubes.
  • Equilibrium molecular dynamics (EMD) simulations to compute slip length and interfacial friction.
  • Non-equilibrium molecular dynamics (NEMD) simulations with varying external fields to extrapolate slip length.
  • Analysis of simulation artifacts contributing to data scatter.

Main Results:

  • Computed slip lengths with greater precision, resolving significant data scattering from previous studies.
  • Identified limitations in NEMD simulations and proposed EMD as a more reliable method for determining slip length.
  • Provided insights into interfacial friction between water and carbon nanotubes.

Conclusions:

  • Molecular dynamics simulations, particularly EMD, can accurately determine slip length for water in carbon nanotubes.
  • Resolved discrepancies in slip length data, offering a more reliable understanding of water flow.
  • Highlighted areas for future research in nanotube fluid dynamics.