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Updated: Dec 8, 2025

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
Published on: March 31, 2018
Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure
Keshav Sharma1, Nathalia L Costa2, Yoong Ahm Kim3
1Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA.
Abstract:
Isolated linear carbon chains (LCCs) encapsulated by multiwalled carbon nanotubes are studied under hydrostatic pressure (P) via resonance Raman scattering. The LCCs' spectroscopic signature C band around 1850 cm^{-1} softens linearly with increasing P. A simple anharmonic force-constant model not only describes such softening but also shows that the LCCs' Young's modulus (E), Grüneisen parameter (γ), and strain (ϵ) follow universal P^{-1} and P^{2} laws, respectively. In particular, γ also presents a unified behavior for all LCCs. To the best of our knowledge, these are the first results reported on such isolated systems and the first work to explore universal P-dependent responses for LCCs' E, ϵ, and γ.
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