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Title: Shock formation and rate effects in impacted carbon nanotube foams

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Journal Article: Publisher's Accepted Manuscript
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Journal Volume: 84; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-05-05 09:31:39; Journal ID: ISSN 0008-6223
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United Kingdom

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Thevamaran, Ramathasan, Meshot, Eric R., and Daraio, Chiara. Shock formation and rate effects in impacted carbon nanotube foams. United Kingdom: N. p., 2015. Web. doi:10.1016/j.carbon.2014.12.006.
Thevamaran, Ramathasan, Meshot, Eric R., & Daraio, Chiara. Shock formation and rate effects in impacted carbon nanotube foams. United Kingdom. doi:10.1016/j.carbon.2014.12.006.
Thevamaran, Ramathasan, Meshot, Eric R., and Daraio, Chiara. 2015. "Shock formation and rate effects in impacted carbon nanotube foams". United Kingdom. doi:10.1016/j.carbon.2014.12.006.
title = {Shock formation and rate effects in impacted carbon nanotube foams},
author = {Thevamaran, Ramathasan and Meshot, Eric R. and Daraio, Chiara},
abstractNote = {},
doi = {10.1016/j.carbon.2014.12.006},
journal = {Carbon},
number = C,
volume = 84,
place = {United Kingdom},
year = 2015,
month = 4

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Publisher's Version of Record at 10.1016/j.carbon.2014.12.006

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Cited by: 10works
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  • Herein we highlight the significance of nanoscale attachment modality as an important determinant of observed electrochemical performance. Specifically, controlled loading ratios of multi-walled carbon nanotubes (MWNTs) have been successfully anchored onto the surfaces of a unique “flower-like” Li 4Ti 5O 12 (LTO) micro-scale sphere motif, for the first time, using a number of different and distinctive preparative approaches, including (i) a sonication method, (ii) an in situ direct-deposition approach, (iii) a covalent attachment protocol, as well as (iv) a π-π interaction strategy. In terms of structural characterization, the composites generated by physical sonication as well as non-covalent π-π interactions retainedmore » the intrinsic hierarchical “flower-like” morphology and exhibited a similar crystallinity profile as compared with that of pure LTO. By comparison, the composite prepared by an in situ direct deposition approach yielded not only a fragmented LTO structure, likely due to the possible interfering presence of the MWNTs themselves during the relevant hydrothermal reaction, but also a larger crystallite size, owing to the higher annealing temperature associated with its preparation. Finally, the composite created via covalent attachment was covered with an amorphous insulating linker, which probably led to a decreased contact area between the LTO and the MWNTs and hence, a lower crystallinity in the resulting composite. In addition electrode tests suggested that the composite generated by π-π interactions out-performed the other three analogous heterostructures, due to a smaller charge transfer resistance as well as a faster Li-ion diffusion. In particular, the LTO-MWNT composite, produced by π-π interactions, exhibited a reproducibly high rate capability as well as a reliably solid cycling stability, delivering 132 mA h g -1 at 50 C, after 100 discharge/charge cycles, including 40 cycles at a high (>20 C) rate. To conclude, such data denote the highest electrochemical performance measured to date as compared with any LTO-carbon nanotube-based composite materials previously reported, under high discharge rate conditions, and tangibly underscore the correlation between preparative methodology and the resulting performance metrics.« less
  • By controlling catalyst pretreatment conditions, we demonstrate that the degree of spinnability of carbon nanotubes (CNTs) is closely related to the morphology of CNT arrays. Shortest catalyst pretreatment time led to CNT arrays with the best spinnability, while prolonged pretreatment resulted in coarsening of catalyst particles and non-spinnable CNTs. We further demonstrate the growth of undulating CNT arrays with uniform and tunable waviness by controlling the coalescence of catalyst particles. The CNT arrays can be tuned from well-aligned, spinnable forests to uniformly wavy, foam-like films by controlling catalyst pretreatment conditions.
  • Particle irradiation is an effective method for manipulating properties of individual carbon nanotubes (CNTs). This potential, however, remains unexplored for macroscopic assemblies of cross-linked CNTs. Here, we study structural and electrical properties of ultralow-density cross-linked CNT-based nanofoams exposed to ion irradiation at room temperature over a wide range of ion masses and fluences. For all irradiation conditions studied, the electrical resistance of nanofoams initially increases with a rate that scales with the number of ballistically generated displacements. This process is attributed to the buildup of defects in graphitic nanoligaments. Irradiation with Ne and heavier ions leads to a decrease inmore » the electrical resistance at large fluences, which is attributed to radiation-induced foam densification. In addition, heavy-ion bombardment causes amorphization of CNTs and smoothing of ligament surfaces. These results demonstrate that ion bombardment can be used for tailoring density, ligament morphology, and electrical properties of CNT-based foams.« less