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Solid Electroytes for CNT based Actuators

Riemenschneider, Johannes und Geier, Sebastian und Mahrholz, Thorsten und Mosch, Jürgen und Monner, Hans Peter und Sinapius, Michael (2009) Solid Electroytes for CNT based Actuators. SPIE Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring 2009, 2009-03-08 - 2009-03-12, San Diego, USA.

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Kurzfassung

Actuators based on carbon nanotubes (CNT) have the potential to generate high forces at very low voltages. The density of the raw material is just 1330 kg/m3, which makes them well applicable for lightweight applications. Moreover, active strains of up to 1% can be achieved - due to the CNTs dimensional changes on charge injection. Therefore the nanotubes have to be arranged and elec-trically wired like electrodes of a capacitor. In previous works the systems response of the Nanotubes comprising a liquid electrolyte was stud-ied in detail. The major challenge is to redo such experiments with solid electrolyte, which is a pre-requisite for structural integration. Most experiments dealing with solid electrolyte based CNT ac-tuators have been performed with bimorph benders, only. Unfortunately, there is no evidence, that resulting displacements which were measured, are caused by a displacement of the nanotubes themselves. There are several other mechanisms that could cause such a structure to bend. Among those are change in mass/volume distribution by mass transport and thermal expansion. In this paper a method is proposed to make sure the expansion is not based on thermal expansion. This is done by analysing the electrical system response. As thermal expansion is dominated by ohmic resistance the CNT based actuators show a strong capacitive behaviour. This behaviour is due to the constitution of the electrochemical double layer around the nanotubes, which causes the tubes to expand. Also a novel test setup is described, which guarantees that the displacement which is measured is not caused by bending of a bimorph but due to expansion of a single layer of nanotubes. This paper also presents experimental results demonstrating both the method of electrical charac-terisation of CNT based actuators based on solid electrolytes and the novel test setup which is used to measure the needed data. The actuators which were characterized are hybrids of CNT and the solid electrolyte Nafion which is supplying the ions needed to constitute the electrochemical double layer. The manufacturing and processing of these actuators is also A general trend of the actuatoric behaviour is shown. Unfortunately, the results are not as clear as those for liquid electrolytes, which is due to the hybrid character of the analysed devices. In the liquid electrolyte based case the CNTs are the only source of stiffness, whereas in the solid electro-lyte case electrodes and electrolyte contribute to the overall stiffness and damping as well. Since the introduction of solid electrolytes is a major stumbling block in the development of such actuators, this work is of particular importance.

elib-URL des Eintrags:https://elib.dlr.de/59947/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Solid Electroytes for CNT based Actuators
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Riemenschneider, JohannesNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Geier, SebastianNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mahrholz, ThorstenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mosch, JürgenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Monner, Hans PeterNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sinapius, MichaelNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:März 2009
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Stichwörter:Carbon Nanotubes, Actuator
Veranstaltungstitel:SPIE Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring 2009
Veranstaltungsort:San Diego, USA
Veranstaltungsart:Konferenz
Veranstaltungsbeginn:8 März 2009
Veranstaltungsende:12 März 2009
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Leiser Luftverkehr (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Adaptronik
Hinterlegt von: Ries, Doris
Hinterlegt am:16 Sep 2009 12:20
Letzte Änderung:24 Apr 2024 19:24

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