Abstract
The electrorheology of silica particles coated with protonatedpolyaniline or polyaniline base in silicone oil has been studied. Thebehaviour of suspensions has been compared with those of bare silica particlesand polyaniline base powder. For a 1 wt.% suspension of polyaniline base, thelow-shear viscosity (at 7.69 s-1) increased more than 25 times in thepresence of the electric field, while the upper-shear viscosity (623 s-1)approached this value in its absence. In suspensions of coated silicaparticles, the viscosity increase was much lower, only a little higher than ina suspension of dry silica particles. The electrorheological performance ofthese systems is discussed in connection with the polarization characteristicsresulting from the frequency spectra of permittivity and dielectric loss ofsuspensions and from the particle dipole coefficient.
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