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Novel Testing Method of Carbon Nanotube-Array Actuators

Geier, Sebastian and Mahrholz, Thorsten and Riemenschneider, Johannes and Wierach, Peter and Sinapius, Miachel (2011) Novel Testing Method of Carbon Nanotube-Array Actuators. NT11 12th International Conference on the Science and Application of Nanotubes, 10. - 17. Juli 2011, Cambridge, England.

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Abstract

Mats of randomly oriented carbon nanotubes, known as Bucky papers, show in contact with an ionic electrolyte an active strain based on the capacitor-like mode of operation. The mats are manufactured by a filtration of an aqueous dispersion. The dispersion is made of commercially available CNT-powder. Various investigations show low reliability and reproducibility of powder-based structures because of the low powder-quality. Furthermore the random orientation of the papers does not allow using the excellent properties of a single CNT. That is the reason why great efforts are made to align the free movable CNTs in the dispersion. Other aligned CNT-based struc-tures like yarns or CNT-array-based papers suffer from low conductibility, low stiffness or bad a-lignment according to the manufacturing process. The mechanism of strain generation still remains undefined but there is a controversial discussion. Either it is a quantum-mechanical lengthening of C-bonds or an electrostatic repulsion between charged CNTs. Maybe it is a superposition of both mechanisms. The presented paper focuses on a method for measuring the free strain of as pro-duced vertically aligned CNT-arrays. This presented test set-up, the way of analysis and the used specimen avoid on the one hand measuring secondary effects and allow on the other hand re-cording the reaction of one MWCNT standing in parallel as an array. Therefore the analysed effect must be dominated by a quantum-mechanical character.

Document Type:Conference or Workshop Item (Speech, Paper, Poster)
Title:Novel Testing Method of Carbon Nanotube-Array Actuators
Authors:
AuthorsInstitution or Email of Authors
Geier, SebastianUNSPECIFIED
Mahrholz, ThorstenUNSPECIFIED
Riemenschneider, JohannesUNSPECIFIED
Wierach, PeterUNSPECIFIED
Sinapius, MiachelUNSPECIFIED
Date:July 2011
Keywords:CNT-arrays, CNT-actuators
Event Title:NT11 12th International Conference on the Science and Application of Nanotubes
Event Location:Cambridge, England
Event Type:international Conference
Event Dates:10. - 17. Juli 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Isolde Böhringer-Thelen
Deposited On:24 Jan 2012 15:30
Last Modified:24 Jan 2012 15:30

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