Exohedral Physisorption of Ambient Moisture Scales Non-monotonically with Fiber Proximity in Aligned Carbon Nanotube Arrays
Name
Itai Stein_Adsorption Model Manuscript.pdf
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2.44 MB
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Author(s)
Stein, Itai Y.
Lachman-Senesh, Noa
Devoe, Mackenzie E.
Wardle, Brian L.
Date Issued
May 2014
Journal
ACS Nano
Publisher
American Chemical Society (ACS)
Citation
Stein, Itai Y., Noa Lachman, Mackenzie E. Devoe, and Brian L. Wardle. “Exohedral Physisorption of Ambient Moisture Scales Non-Monotonically with Fiber Proximity in Aligned Carbon Nanotube Arrays.” ACS Nano 8, no. 5 (May 27, 2014): 4591–4599.
Version
Author's final manuscript
Abstract
Here we present a study on the presence of physisorbed water on the surface of aligned carbon nanotubes (CNTs) in ambient conditions, where the wet CNT array mass can be more than 200% larger than that of dry CNTs, and modeling indicates that a water layer >5 nm thick can be present on the outer CNT surface. The experimentally observed nonlinear and non-monotonic dependence of the mass of adsorbed water on the CNT packing (volume fraction) originates from two competing modes. Physisorbed water cannot be neglected in the design and fabrication of materials and devices using nanowires/nanofibers, especially CNTs, and further experimental and ab initio studies on the influence of defects on the surface energies of CNTs, and nanowires/nanofibers in general, are necessary to understand the underlying physics and chemistry that govern this system.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/nn5002408
