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Published on: April 15, 2013
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Water transport through functionalized nanotubes with tunable hydrophobicity
Ian Moskowitz1, Mark A Snyder1, Jeetain Mittal1
1Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
The Journal of Chemical Physics
|November 17, 2014
Summary
A small fraction of hydrophilic atoms in nanotubes can lead to spontaneous water filling. Water flow and occupancy are mainly determined by the fraction of hydrophilic atoms, not their arrangement.
Area of Science:
- Computational chemistry
- Materials science
Background:
- Functionalized carbon nanotubes (CNTs) are crucial in nanotechnology.
- Understanding water transport in nanotubes is key for applications like water purification and drug delivery.
Purpose of the Study:
- To investigate the effect of hydrophilic and hydrophobic atom fractions on water occupancy and flow in simulated nanotubes.
- To explore how the arrangement of these atoms influences water transport dynamics.
Main Methods:
- Molecular dynamics simulations were performed on (6,6) CNT models.
- Simulations varied the fraction (f) and arrangement of hydrophilic atoms within the nanotube lattice.
- TIP3P water model was used to study single-file water motion.
Main Results:
- Water occupancy in nanotubes increases nonlinearly with the fraction of hydrophilic atoms.
- A hydrophilic fraction of approximately 0.4 is sufficient for continuous nanotube filling.
- Water flux shows a linear increase with hydrophilic fraction for f < 0.4, then plateaus.
Conclusions:
- The fraction of hydrophilic atoms, rather than their specific arrangement, is the primary determinant of water occupancy and flux.
- An effective interaction strength model quantitatively explains the observed water behavior in functionalized nanotubes.
