Electrorheological effect in suspensions of polyaniline

Anna Gozdalik , Henryk Wyciślik , Janusz Płocharski

Abstract

The electrorheological (ER) effect relies on the increase of viscosity of a fluid under electric field. The studied ER fluids (ERFs) were prepared out of silicone oil and polyaniline lightly protonated with four different acids of pKa values from −8 to +1.8. Rheological properties of the ERFs were measured under electric field up to 2.3 kV/mm. The influence of the protonation level of polyaniline and the acid used on the magnitude of the ER effect was studied. We propose an explanation of the observed relations based on measurements of dielectric properties of the polymers. The strongest ER effect was observed for polyaniline samples whose relaxation frequency was about 8 kHz, supporting the idea that the relatively slow polarisation processes were responsible for the ER effect. In addition, it was demonstrated that conductivity and dielectric constant of the polymers depended on the strength of the acids applied.
Author Anna Gozdalik
Anna Gozdalik,,
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, Henryk Wyciślik
Henryk Wyciślik,,
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, Janusz Płocharski (FC / CICSST)
Janusz Płocharski,,
- Chair Of Inorganic Chemistry And Solid State Technology
Journal seriesSynthetic Metals, ISSN 0379-6779
Issue year2000
Vol109
No1–3
Pages147-150
Keywords in EnglishAcid strength, Conductivity, Dielectric constant, Electrorheological effect, Polyaniline
ASJC Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics; 2504 Electronic, Optical and Magnetic Materials
DOIDOI:10.1016/S0379-6779(99)00216-7
URL http://www.sciencedirect.com/science/article/pii/S0379677999002167
Score (nominal)30
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2014 = 0.943; WoS Impact Factor: 2006 = 1.685 (2) - 2007=1.681 (5)
Citation count*18 (2015-08-25)
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