Abstract
Nitrogen-enriched carbonaceous nanotubes (N-CTs) were prepared by the carbonization ofpolyaniline (PANI) nanotubes in vacuum and were demonstrated to possess goodelectrorheological (ER) performance. In this paper, the temperature dependence of the ERproperties of the suspension composed of N-CTs in silicone oil was systematicallyinvestigated by steady shear viscosity and dynamic viscoelastic measurements. Theseshowed that under electric fields the N-CT suspension showed good temperature stabilityof its ER properties though its zero-field viscosity decreased with elevated temperatures.Meanwhile, the flow curve of shear stress versus shear rate also maintained a stable leveland the critical shear rate shifted towards high values as the operating temperatureincreased. The dynamic viscoelastic measurement showed that the storage modulus slightlyincreased with increasing operating temperature, also confirming the good temperaturestability of the ER properties of the N-CT suspension. The dielectric spectra of the N-CTsuspension and the dielectric parameters calculated by the Cole–Cole equation couldexplain the temperature dependence of the ER properties of the N-CT suspension.
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