Electrorheological characterization of polyaniline dispersions

Choi, Hyoung Jin; Kim, T.W.; Cho, M.S.; Kim, S.G.; Jhon, Myung S.

doi:10.1016/s0014-3057(96)00225-x

Cited by 124 publications

(32 citation statements)

References 11 publications

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“…As the content of PANI of the composites increased from 4 to 25 wt%, the conductivities of films are increased. Furthermore, small increase in electrical conductivity with increasing the molecular weight of polymeric stabilizer was observed [15].…”

Section: Resultsmentioning

confidence: 97%

Synthesis and electrical characteristics of polyaniline nanoparticles and their polymeric composite

Park

Cho

Choi

2004

Current Applied Physics

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Section: Resultsmentioning

confidence: 97%

Synthesis and electrical characteristics of polyaniline nanoparticles and their polymeric composite

Park

Cho

Choi

2004

Current Applied Physics

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“…Its chemical structure given by alternating of a-and nbonds and the presence charge carriers allows controlling conductivity of PANI by treatment with various organic and inorganic acids to various extents [13][14][15]. Electric properties of PANI can also be influenced efficiently by changing of the reaction conditions during the polymerization of aniline [16,17]. Thus, the material with variable conductivity and dielectric properties [18][19][20][21] can be obtained, while the morphology and particle size of PANI remain virtually the same [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrophilicity of polyaniline particles on their electrorheology: Steady flow and dynamic behaviour

Stěnička

Pavlı́nek

Sáha

et al. 2010

Journal of Colloid and Interface Science

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A B S T R A C TElectrorheological properties of suspensions are considerably affected by hydrophilicity of suspension particles. As a model material, polyaniline base powder protonated with sulfamic, tartaric, or perfluo-rooctanesulfonic acids provided particles of various hydrophilicity. The experiments revealed that, in the absence of electric field, due to a good compatibility of hydrophobic polyaniline particles with sili-cone-oil medium, their interactions were limited and the viscosity of suspension was low. When the electric field was applied, the rigidity of the polarized chain structure of the particles increased and, consequently, viscosity increased as well. In the contrast, the field-off suspension viscosity of highly interacting hydrophilic particles, which are incompatible with the oil, and where particle aggregation may set in, was high especially at low shear rates, and the material had a pseudoplastic character. Then, a relative increase in viscosity due to the polarization of the particles or their clusters in the electric field was much lower than in the former case. Due to a different primary structure of suspension, depending on the particle compatibility with the oil the field-off storage modulus of suspensions of hydrophobic particles was lower than the loss modulus, while in suspensions of hydrophilic particles the former modulus dominated. In both cases, an increase in elasticity with increasing electric field strength was higher than that in viscosity.

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“…Under the action of the field, the particles form three dimensional fibrillar structures, which are aligned along the direction of the electric field and generate additional resistance against fluid motion [2]. With their adjustable viscosity, fast response, and reversible rheological behavior, ER fluids are regarded as smart materials, with potential for applications in active devices, which transform electric energy to mechanical energy [3]. Possible examples include clutches, breaks, shock absorbers, engine mounts, valves, flow pumps, and other variable control and servo devices [4].…”

Section: Introductionmentioning

confidence: 99%

“…Dimensionless parameters, the Mason number (Mn) and Peclet number (Pe), associated with the onset of the transition, are correlated according to a scaling relation. 3 and kinematic viscosities of 10 -4 m 2 /s (100 cSt), 5·10 -4 m 2 /s, and 10 -3 m 2 /s were vacuum-dried and stored in a desiccator prior to use.…”

Section: Introductionmentioning

confidence: 99%

Field strength dependence of the high-frequency viscoelastic relaxation process in polyaniline/silicone oil electrorheological suspensions

Hiamtup¹,

Sirivat²,

Jamieson³

2008

Express Polym. Lett.

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Abstract. Polyaniline (PANI) was synthesized via oxidative coupling polymerization in acid conditions and de-doped in ammonia solution. The electrorheological (ER) properties of the PANI/silicone oil suspensions were investigated in the oscillatory mode shear, with particular focus on the high frequency region, where a crossover in G′(ω) and G″(ω) signals the onset of a dissipative relaxation process, presumed to be associated with motion of PANI particles within the fibrillar structures generated by the electric field. The relationship between the crossover frequency, ωc, and the electric field strength (E) was investigated as a function of matrix viscosity and shear strain. We find that ωc increases with increasing electric field strength, and decreases with increases of matrix viscosity and strain amplitude. These observations are in qualitative agreement with a theoretical model, which relates the relaxation mechanism to the competition between hydrodynamic and electrostatic forces between PANI particles within thick fibrillar structures. At the crossover point, a critical scaling relation is found relating two dimensionless parameters, the Mason number (Mn), and the Peclet number (Pe), viz. Mn~(Pe) 0.09 .

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Electrorheological characterization of polyaniline dispersions

Cited by 124 publications

References 11 publications

Synthesis and electrical characteristics of polyaniline nanoparticles and their polymeric composite

Synthesis and electrical characteristics of polyaniline nanoparticles and their polymeric composite

Effect of hydrophilicity of polyaniline particles on their electrorheology: Steady flow and dynamic behaviour

Field strength dependence of the high-frequency viscoelastic relaxation process in polyaniline/silicone oil electrorheological suspensions

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