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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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|
|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|
|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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