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Estimation of ion dimension doped in conducting polymers electrochemically

Published online by Cambridge University Press:  02 January 2018

Keiichi Kaneto ,
Fumito Hata  and
Sadahito Uto
Keiichi Kaneto*
Affiliation:
Department of Biomedical Engineering, Osaka Institute of Technology, 5-16-1, Ohmiya, Asahi-ku, Osaka, 535-8585, Japan
Fumito Hata
Affiliation:
Department of Biomedical Engineering, Osaka Institute of Technology, 5-16-1, Ohmiya, Asahi-ku, Osaka, 535-8585, Japan
Sadahito Uto
Affiliation:
Department of Biomedical Engineering, Osaka Institute of Technology, 5-16-1, Ohmiya, Asahi-ku, Osaka, 535-8585, Japan
*
*(Email: [email protected])
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Abstract

Electroactive conducting polymers are suitable for soft actuators (artificial muscles). The actuation is induced by electrochemical oxidation of conducting polymer (film) in an electrolyte solution, due to insertion of bulky counter ions (dopant ions). The magnitude of deformation (strain) depends on the size of dopant ions and the degree of oxidation. It is worthwhile to know the relationship between the magnitudes of deformation and ion size. An electrodeposited Polypyrrole film was electrochemically cycled in aqueous electrolytes of NaCl, NaBr, NaNO3, NaBF4 and NaClO4. The strain of film during electrochemical oxidation and reduction was precisely measured using a laser displacement meter and a handmade apparatus. From the strain and electrical charges inserted in the film during oxidation, the volumes and radii of dopant ions were estimated, assuming the isotropic expansion of the film. The estimated anion radii of Cl-, Br-, NO3-, BF4- and ClO4- were 235, 246, 250, 270 and 290, respectively. The results were discussed taking the crystallographic and hydrated ion radii in literatures into consideration.

Keywords

biomimetic (assembly)polymeractuator
Type
Articles
Information
MRS Advances , Volume 3 , Issue 27: Biomaterials and Soft Materials , 2018 , pp. 1543 - 1549
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Copyright
Copyright © Materials Research Society 2017 

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References

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