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Strain measurements on scattered, highly oriented CNTs

Geier, Sebastian and Mahrholz, Thorsten and Johannes, Riemenschneider and Wierach, Peter and Sinapius, Michael (2013) Strain measurements on scattered, highly oriented CNTs. In: Proceedings of SPIE Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring 2013, 8691 (35). SPIE. 2013 Smart Structures / NDE, 10-14. März 2013, San Diego, Kalifornien, USA.

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Since carbon nanotubes (CNTs) have been discovered in 1991, worldwide scientific research reveals excellent properties. Most of the found properties refer to almost defect-free, single-walled carbon nanotubes (SWCNTs) with nano-scale dimensions. However, scientists try to incorporate CNTs into applications to transfer their features in order to push the specific performance. Typically the results are comparably lower than expected because of the varying quality of used CNTs. This paper presents results of research using CNTs as actuators. In contrast to published paper which analyzed architectures of entangled CNTs as active components, like papers or yarns, to measure their bulk-strain this paper focuses on scattered, highly aligned CNTs. This approach promises to clarify the effect of actuation, whether it is a quantum-mechanically, or rather an combined electrostatic volume-transfer effect. Two experimental set-ups are presented. The first experiment is carried out using highly aligned multi-walled CNTs (MWCNT-arrays). Their orientation is investigated intensively in comparison to other analyzed CNT-arrays. Furthermore their substrate consists of electrical conductive carbon. The CNT-array is optically analyzed along the longitudinal geometry of the vertically aligned MWCNTs. The interfaces of the set-up, which may influence the measurement, have been analyzed in order to avoid second-order effects like thermal swelling or chemical degradation. The results reveal comparable high deflections starting at an activation-voltage of ±1.75V. The ionic liquid is tested within a voltage-range of ±2V due to time-staple performance. The second presented results are found by using Raman-spectroscopy to analyze single SWCNTs. This paper presents the first results of the challenging test campaign to analyze single-walled nanotubes within an electrolyte during charging. A shifting of Raman-peaks according to the wavenumber can be directly attributed to a geometry-change. Thus, the two presented experiments uses aligned CNTs a driving actuation mechanism of single CNTs may be identified. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Item URL in elib:https://elib.dlr.de/89165/
Document Type:Conference or Workshop Item (Speech)
Title:Strain measurements on scattered, highly oriented CNTs
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Johannes, RiemenschneiderFA-ADAUNSPECIFIED
Sinapius, MichaelTU Braunschweig / DLR BraunschweigUNSPECIFIED
Date:13 March 2013
Journal or Publication Title:Proceedings of SPIE Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Proceedings of SPIE
Keywords:Carbon nanotubes ; Chemicals ; Interfaces ; Raman spectroscopy ; Scientific research ; Single walled carbon nanotubes ; Actuators ; Carbon
Event Title:2013 Smart Structures / NDE
Event Location:San Diego, Kalifornien, USA
Event Type:international Conference
Event Dates:10-14. März 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Geier, Sebastian
Deposited On:19 May 2014 09:57
Last Modified:19 May 2014 09:57

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