Schematic of furnace and reactant introduction assembly used for CVD.
SEM stage attachment: either the blade attachment (a) or a load cell attachment (b) can be used. Sample is held at (c) with rotation and two-axis motion control independent of blade/load cell attachment.
Cutting sequence, arrows show sample movement. (a) Sample is positioned at desired location and moved into blade. (b) Sample is pulled away from blade, sectioning off a portion of the CNT mat. (c) Example of final cut sample.
tall, well-aligned mat of carbon nanotubes grown with vapor-phase CVD, scale bars is .
Average carbon nanotube compressive stress-strain response in both parallel and perpendicular orientations.
Average nanotube tensile stress-strain response, TMA tests.
(a) SEM micrograph of CNT mat showing low tube density and tube spacing. (b) TEM micrograph showing tube inner and outer diameter variations.
Comparison of strain calculated from micrometer position and strain measured directly from nanotube mat sample, tension tests.
In situ carbon nanotube tension and compression stress-strain results (stresses corrected for actual area).
Time-dependent response of nanotube mats; in the tension test, each strain step is strain, in compression, each strain step is .
Strain recovery in carbon nanotube mats between compression tests, values next to data points indicate% strain recovered from previous test.
Large-scale buckling of carbon nanotube mats observed in compression tests.
(a) SEM micrograph of glue failure. (b) Micrograph of nanotube mat after failure under tensile loading ( scale bars).
Failure surface of CNT mat, showing loose nanotube ends caused by nanotube slip and pullout ( scale bars).
[(a)–(c)] Maxwell stress relaxation fit plots for tension, compression, and unloading. (d) relaxation modulus plotted against strain for two compression tests.
Summary of modulus results for nanotube mats. Corrected in situ results have been adjusted to remove stress relaxation effect. Stress relaxation is presented for in situ results with incremental strain steps only; relaxation data have been corrected for the small relaxation due to equipment used.
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