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Actuation-mechanisms of CNT-bucky papers and CNT-arrays

Geier, Sebastian and Mahrholz, Thorsten and Wierach, Peter and Sinapius, Michael (2015) Actuation-mechanisms of CNT-bucky papers and CNT-arrays. In: Proceeding of SPIE Smart Structures NDE, Conference 9432: Behavior and Mechanics of Multifunctional Materials and Composites IX, 9432. SPIE. SPIE Smart Structures NDE, 09-12 März 2015, San Diego, Kalifornien, USA. (In Press)

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In the fields of smart materials there is still a demand for a material featuring high modulus, low density and large strain. Carbon materials catch enormous scientific attention not only since carbon fibers were used for highperformance composite structures. But more and more the scientific attention moves from the macroscale to the nanoscale. This paper focuses with a adaptive point of view on one of the carbon allotropes: carbon nanotubes (CNTs). Beside excellent electromechanical properties another interesting feature was first mentioned 1999 – the active behavior of paper-like mats (bucky-papers) made of CNTs. CNT-papers are electrically activated using a double-layer interaction of ions provided by an electrolyte and the charged, high specific surface area of the paper formed by carbon nanotubes. Until now the detailed mechanism behind the strain/force gen-eration of CNT-based architectures is unknown. A clarification of this principle reveals the potential of carbon tubes to be or not to be a resilient smart material in order to use their strong covalent carbon bonds instead of weak van der Waals force as tube-linking. This paper presents further investigations about the composition of CNT-papers and their performance in contrast to vertical aligned CNT-arrays using an actuated tensile test set-up. For better comparison the experiments of both specimen-types are carried out in dry, wet and wet/charged conditions. Especially in the case of CNT-arrays it is essential to preload the specimens because the curly CNT-structure superim-poses the vertical orientation. While the CNT-paper is tested in an aqueous solution of one molar sodium chloride, the hydrophobic character of CNT-arrays requires an ionic liquid (IL) as electro-lyte. It is found that the mechanical properties of CNT-papers drop significantly by wetting and can be controlled by charging what indicates an electrostatic dominated effect. In contrast the CNT-arrays show identical results regardless of the test conditions and furthermore an active, reversible behavior of tube elongation by charging. These results indicate strongly a quantum mechanical effect as reason of a CNT-array actuation.

Item URL in elib:https://elib.dlr.de/95654/
Document Type:Conference or Workshop Item (Speech)
Title:Actuation-mechanisms of CNT-bucky papers and CNT-arrays
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Geier, SebastianSebastian.Geier (at) dlr.deUNSPECIFIED
Mahrholz, ThorstenThorsten.Mahrholz (at) dlr.deUNSPECIFIED
Wierach, PeterPeter.Wierach (at) dlr.deUNSPECIFIED
Sinapius, MichaelMichael.Sinapius (at) dlr.deUNSPECIFIED
Date:10 March 2015
Journal or Publication Title:Proceeding of SPIE Smart Structures NDE, Conference 9432: Behavior and Mechanics of Multifunctional Materials and Composites IX
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Proceedings of SPIE Smart Structures NDE
Status:In Press
Keywords:carbon nanotube, actuator, bucky-paper, CNT-array, liquid electrolyte, solid electrolyte, actuation mechanism
Event Title:SPIE Smart Structures NDE
Event Location:San Diego, Kalifornien, USA
Event Type:international Conference
Event Dates:09-12 März 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Geier, Sebastian
Deposited On:23 Mar 2015 09:51
Last Modified:23 Mar 2015 09:51

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