elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

COMPOSITION- AND ION-DEPENDING ACTUATION MECHANISM OF CARBON NANOTUBE ARCHITECTURES

Geier, Sebastian and Mahrholz, Thorsten and Wierach, Peter and Sinapius, Michael (2017) COMPOSITION- AND ION-DEPENDING ACTUATION MECHANISM OF CARBON NANOTUBE ARCHITECTURES. In: Proceedings of the 8th ECCOMAS SMART 2017. 8th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2017, 5.6-7.6.2017, Madrid, Spanien.

Full text not available from this repository.

Abstract

Future adaptive applications such as morphing surfaces require materials featuring low density, high mechanical stiffness, high active strain but low energy consumption. These properties are well combined by carbon nanotubes (cnts)-based actuators which are typically made of paper-like mats. Two carbon nanotube-papers are arranged towards to each other within an electrolyte. The charging of these papers results in an electrical field which forms a double-layer of the electrolyte ions at the surface of the electrodes. During charging a deflection of the papers can be detected. Although various cnt-architecures have been extensively analysed there is still no generally accepted theory for the actuation mechanism. This paper focuses on investigations of the actuation mechanisms of cnt-papers in comparison to cnt-arrays. The cntpapers represent architectures of randomly oriented and entangled cnts. The sample geometry is formed by micro-sized cnts. In contrast cnt-arrays are based on multi-walled cnts whose length is as long as the sample length. Both sample types are tested within an actuated tensile test set-up under different conditions. The cnt-papers are tested in water-based electrolytes while the hydrophobic cnt-arrays need to be tested in ionic liquids. Furthermore different ions are used to investigate the influence of the ion-radius on the properties. Regarding the cnt-papers, these tests are completed by in-plane actuation tests measuring the free strain. During the actuated tensile tests three parameters were indentified to influence the mechanical performance of cnt-papers decisively: the humidity of the conditions under which the papers are tested, a preloading of the sample and the electrical charging. All these influencing factors point at the weak inter-tube linking which seem to influence not only the actuation but also the mechanical properties of cnt-papers. Finding a general trend of influencing conditions on the mechanical behaviour of cnt-arrays turns out to be dfficult because of varying results. The mounting of the samples seems to be an important influence. However, the quadratic voltage-strain correlation suggests an electrostatic effect maybe on a quantum-chemical level of the carbon structure.

Item URL in elib:https://elib.dlr.de/113019/
Document Type:Conference or Workshop Item (Speech)
Title:COMPOSITION- AND ION-DEPENDING ACTUATION MECHANISM OF CARBON NANOTUBE ARCHITECTURES
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Geier, Sebastiansebastian.geier (at) dlr.dehttps://orcid.org/0000-0001-7941-3630
Mahrholz, ThorstenThorsten.Mahrholz (at) dlr.deUNSPECIFIED
Wierach, Peterpeter.wierach (at) dlr.deUNSPECIFIED
Sinapius, Michaelmichael.sinapius (at) dlr.deUNSPECIFIED
Date:June 2017
Journal or Publication Title:Proceedings of the 8th ECCOMAS SMART 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmailEditor's ORCID iD
G�uemes, AUNSPECIFIEDUNSPECIFIED
Benjeddou, AUNSPECIFIEDUNSPECIFIED
Rodellar, JUNSPECIFIEDUNSPECIFIED
Leng, JUNSPECIFIEDUNSPECIFIED
Status:Published
Keywords:Carbon nanotube, actuator, actuation mechanism, electrolyte.
Event Title:8th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2017
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:5.6-7.6.2017
Organizer:European Community on Computational Methods in Applied Science
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:14 Aug 2017 08:28
Last Modified:05 Mar 2018 06:36

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.