Environmental damping and vibrational coupling of confined fluids within isolated carbon nanotubes
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s41467-024-49661-8.pdf
Description
Published version
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3.84 MB
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Checksum (MD5)
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Author(s)
Tu, Yu-Ming
Kuehne, Matthias
Misra, Rahul Prasanna
Ritt, Cody L
Oliaei, Hananeh
Faucher, Samuel
Li, Haokun
Xu, Xintong
Penn, Aubrey
Yang, Sungyun
Date Issued
2024
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Tu, YM., Kuehne, M., Misra, R.P. et al. Environmental damping and vibrational coupling of confined fluids within isolated carbon nanotubes. Nat Commun 15, 5605 (2024).
Version
Final published version
Abstract
Because of their large surface areas, nanotubes and nanowires demonstrate exquisite mechanical coupling to their surroundings, promising advanced sensors and nanomechanical devices. However, this environmental sensitivity has resulted in several ambiguous observations of vibrational coupling across various experiments. Herein, we demonstrate a temperature-dependent Radial Breathing Mode (RBM) frequency in free-standing, electron-diffraction-assigned Double-Walled Carbon Nanotubes (DWNTs) that shows an unexpected and thermally reversible frequency downshift of 10 to 15%, for systems isolated in vacuum. An analysis based on a harmonic oscillator model assigns the distinctive frequency cusp, produced over 93 scans of 3 distinct DWNTs, along with the hyperbolic trajectory, to a reversible increase in damping from graphitic ribbons on the exterior surface. Strain-dependent coupling from self-tensioned, suspended DWNTs maintains the ratio of spring-to-damping frequencies, producing a stable saturation of RBM in the low-tension limit. In contrast, when the interior of DWNTs is subjected to a water-filling process, the RBM thermal trajectory is altered to that of a Langmuir isobar and elliptical trajectories, allowing measurement of the enthalpy of confined fluid phase change. These mechanisms and quantitative theory provide new insights into the environmental coupling of nanomechanical systems and the implications for devices and nanofluidic conduits.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
https://doi.org/10.1038/s41467-024-49661-8
