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Proceedings Paper

Thermo-active polymer nanocomposites: a spectroscopic study
Author(s): A. Douglas Winter; Eduardo Larios; Cherno Jaye; Daniel A. Fischer; Mária Omastová; Eva M. Campo
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Paper Abstract

Photo- and thermo-mechanical actuation behaviour in specific polymer-carbon nanotube composites has been observed in recent years and studied at the macroscale. These systems may prove to be suitable components for a wide range of applications, from MOEMs and nanotechnology to neuroscience and tissue engineering. Absence of a unified model for actuation behaviour at a molecular level is hindering development of such smart materials. We observed thermomechanical actuation of ethylene-vinyl acetate | carbon nanotube composites through in situ near-edge X-ray absorption fine structure spectroscopy to correlate spectral trends with macroscopic observations. This paper presents spectra of composites and constituents at room temperature to identify resonances in a building block model, followed by spectra acquired during thermo-actuation. Effects of strain-induced filler alignment are also addressed. Spectral resonances associated with C=C and C=O groups underwent synchronised intensity variations during excitation, and were used to propose a conformational model of actuation based on carbon nanotube torsion. Future actuation studies on other active polymer nanocomposites will verify the universality of the proposed model.

Paper Details

Date Published: 15 September 2014
PDF: 7 pages
Proc. SPIE 9170, Nanoengineering: Fabrication, Properties, Optics, and Devices XI, 917003 (15 September 2014); doi: 10.1117/12.2064904
Show Author Affiliations
A. Douglas Winter, Bangor Univ. (United Kingdom)
Eduardo Larios, Univ. of Texas at San Antonio (United States)
Cherno Jaye, National Institute of Standards and Technology (United States)
Daniel A. Fischer, National Institute of Standards and Technology (United States)
Mária Omastová, Polymer Institute (Slovakia)
Eva M. Campo, Bangor Univ. (United Kingdom)
Univ. of Texas at San Antonio (United States)

Published in SPIE Proceedings Vol. 9170:
Nanoengineering: Fabrication, Properties, Optics, and Devices XI
Eva M. Campo; Elizabeth A. Dobisz; Louay A. Eldada, Editor(s)

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