Nano Archive

Thermal fluctuations, stress relaxation, and actuation in carbon nanotube networks

Ahir, S. V. and Terentjev, E. M. and Lu, S. X. and Panchapakesan, B. (2007) Thermal fluctuations, stress relaxation, and actuation in carbon nanotube networks. PHYSICAL REVIEW B, 76 (16).

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Do carbon nanotubes behave like polymers? The answer appears to be-some do and some do not, depending on the number of walls. Analyzing the behavior of carbon nanotube networks, as found in sheets of `' bucky paper,'' provides an intriguing insight into the characteristics of nanotubes, noninvasively deducing the fundamental response of individual tubes from the average characteristics of the collective. We report stress relaxation experiments on single- and multiwalled carbon nanotube networks and also present their reversible photomechanical actuation response. Experimental similarities between multiwalled nanotube networks and a `' sticky `' granular system are observed, while single-walled tubes display entropic behavior akin to a polymer network. In both cases, photostimulated actuation is orders of magnitude larger than thermal expansion predictions. The analogy between single-walled tubes and entropically driven polymer chains, and between multiwalled tubes and granular networks, suggests a paradigm for theoretical and experimental analysis.

Item Type:Article
Uncontrolled Keywords:carbon nanotubes, polymers, stress relaxation, thermal expansion
Subjects:Physical Science > Nanophysics
ID Code:270
Deposited By:Lesley Tobin
Deposited On:24 Nov 2008 16:26
Last Modified:05 Feb 2009 12:29

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