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Investigation of aligned carbon nanotube architectures to understand the actuation mechanism

Geier, Sebastian and Riemenschneider, Johannes and Mahrholz, Thorsten and Wierach, Peter and Sinapius, Michael (2012) Investigation of aligned carbon nanotube architectures to understand the actuation mechanism. SPIE Smart Structures/NDE, 12. - 15. März 2012, San Diego, USA.

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Abstract

The various excellent properties of carbon nanotubes (CNTs) are in the focus of researchers since years. Moreover architectures, built of CNTs, show active behavior in terms of deflections. There-fore they have to be set up like a capacitor within an electric field and covered by a matrix of free movable ions. The mechanism behind this phenomenon is still discussed obsessively rather to be an quantum-mechanical elongation of the C-bonds or to be caused by electrostatic repulsion of charged agglomerated CNTs. Formally investigated paper-like architectures, known as Bucky-papers, consist of randomly oriented CNTs. This paper presents several experimental approaches and results documenting doubts about the ability to clarify the active mechanism by investigating the electromechanical properties of those paper-like architectures. In contrast a novel test set-up for analyzing specimen, providing highly vertically aligned CNTs, is presented. This high resolution test set-up is designed to analyze CNT-specimen in thickness-direction optically. The vertically aligned CNT-architectures, also called CNTarrays, consist of multi-walled CNTs (MWCNTs). The MWCNT-arrays are highly hydrophobic and can only be moistened by polar liquids like ionic liquids (ILs). The latest results of the electro-mechanical system as well as further challenges dealing with ILs and different kinds of CNT-arrays are presented. The presented measurement method allows an even more precise investigation of the electro-mechanical behavior of a single MWCNT and the strain-mechanism simultaneously. Furthermore this configuration points out an efficient mode of future CNT-based actuators.

Document Type:Conference or Workshop Item (Paper)
Title:Investigation of aligned carbon nanotube architectures to understand the actuation mechanism
Authors:
AuthorsInstitution or Email of Authors
Geier, SebastianFA-MFW
Riemenschneider, JohannesFA-ADA
Mahrholz, ThorstenFA-MFW
Wierach, PeterFA-MFW
Sinapius, MichaelFA-LTG
Date:March 2012
Keywords:carbon nanotube, actuator, Bucky-paper, CNT-array, liquid electrolyte, solid electrolyte, actuation mechanism
Event Title:SPIE Smart Structures/NDE
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:12. - 15. März 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Isolde Böhringer-Thelen
Deposited On:29 Mar 2012 15:11
Last Modified:17 Jan 2013 14:12

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