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Higher Recovery and Better Energy Dissipation at Faster Strain Rates in Carbon Nanotube Bundles: An in-Situ Study

Pathak, Siddhartha and Lim, Ee J. and Abadi, Parisa Pour Shahid Saeed and Graham, Samuel and Cola, Baratunde A. and Greer, Julia R. (2012) Higher Recovery and Better Energy Dissipation at Faster Strain Rates in Carbon Nanotube Bundles: An in-Situ Study. ACS Nano, 6 (3). pp. 2189-2197. ISSN 1936-0851 . http://resolver.caltech.edu/CaltechAUTHORS:20120420-144857331

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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 capability, as revealed by hysteresis in load–unload cycles. These findings, together with high thermal and electrical conductivities, position VACNTs in the “unattained-as-of-to-date-space” in the material property landscape.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nn300376jDOIArticle
http://pubs.acs.org/doi/abs/10.1021/nn300376jPublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2012 American Chemical Society. Received for review October 24, 2011 and accepted February 14, 2012. Publication Date (Web): February 14, 2012. The authors acknowledge S. Hutchens for helpful insights and guidance, N. Mohan for data analysis, financial support from the Georgia Institute of Technology Foundation through the Joseph Anderer Faculty Fellowship, and the Institute for Collaborative Biotechnologies (ICB) for financial support through Grant W911NF-09-0001 from the U.S. Army Research Office. The content of the information does not necessarily reflect the position or the policy of the Government, and no official endorsement should be inferred. S.P. gratefully acknowledges support from the W. M. Keck Institute for Space Studies Postdoctoral Fellowship programfor this work. The authors acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech.
Group:Keck Institute for Space Studies, Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Georgia Institute of Technology Foundation Joseph Anderer Faculty FellowshipUNSPECIFIED
Army Research Office (ARO)W911NF-09-0001
Keck Institute for Space Studies (KISS)UNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Subject Keywords:vertically aligned carbon nanotubes; compression; mechanical properties; energy storage; recovery
Record Number:CaltechAUTHORS:20120420-144857331
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120420-144857331
Official Citation:Higher Recovery and Better Energy Dissipation at Faster Strain Rates in Carbon Nanotube Bundles: An in-Situ Study Siddhartha Pathak, Ee J. Lim, Parisa Pour Shahid Saeed Abadi, Samuel Graham, Baratunde A. Cola, and Julia R. Greer ACS Nano 2012 6 (3), 2189-2197
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30243
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Apr 2012 14:35
Last Modified:16 Oct 2015 02:06

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