Higher recovery and better energy dissipation at faster strain rates in carbon nanotube bundles: an in-situ study

ACS Nano
Siddhartha PathakJulia R Greer

Abstract

We report mechanical behavior and strain rate dependence of recoverability and energy dissipation in vertically aligned carbon nanotube (VACNT) bundles subjected to quasi-static uniaxial compression. We observe three distinct regimes in their stress-strain curves for all explored strain rates from 4 × 10(-2) down to 4 × 10(-4)/sec: (1) a short initial elastic section followed by (2) a sloped plateau with characteristic wavy features corresponding to buckle formation and (3) densification characterized by rapid stress increase. Load-unload cycles reveal a stiffer response and virtually 100% recoverability at faster strain rates of 0.04/sec, while the response is more compliant at slower rates, characterized by permanent localized buckling and significantly reduced recoverability. We propose that it is the kinetics of attractive adhesive interactions between the individual carbon nanotubes within the VACNT matrix that governs morphology evolution and ensuing recoverability. In addition, we report a 6-fold increase in elastic modulus and gradual decrease in recoverability (down to 50%) when VACNT bundles are unloaded from postdensification stage as compared with predensification. Finally, we demonstrate energy dissipation capabili...Continue Reading

References

Nov 29, 2005·Science·Anyuan CaoPulickel M Ajayan
Jul 26, 2008·Nature Nanotechnology·J SuhrP M Ajayan
Apr 2, 2010·Journal of Nanoscience and Nanotechnology·Mukul Kumar, Yoshinori Ando
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May 1, 2012·Nanoscale·Parisa Pour Shahid Saeed AbadiSamuel Graham

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Citations

May 1, 2012·Nanoscale·Parisa Pour Shahid Saeed AbadiSamuel Graham
Sep 9, 2015·Scientific Reports·Na NiEduardo Saiz
Dec 5, 2012·Advanced Materials·Zhiping ZengZikang Tang
Feb 19, 2013·Advanced Materials·Han HuJieshan Qiu
Oct 1, 2016·ACS Applied Materials & Interfaces·Benjamin F DavisMatthew R Maschmann
Dec 14, 2016·Science Advances·Sanha KimA John Hart
Nov 7, 2013·Nanotechnology·Parisa Pour Shahid Saeed AbadiBaratunde A Cola
Sep 4, 2019·ACS Applied Materials & Interfaces·Josef BrownMatthew R Maschmann

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