Electrorheological properties of polyaniline suspensions: Field-induced liquid to solid transition and residual gel structure

Hiamtup, Piyanoot; Sirivat, Anuvat; Jamieson, A. M.

doi:10.1016/j.jcis.2005.07.067

Cited by 59 publications

(31 citation statements)

References 35 publications

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“…PANI particle electrical conductivity is 2.93·10 -9 S/cm. A PANI of low conductivity was chosen in order to be able to investigate ER behavior at high electric field strength without current leakage in the system [12]. The dynamic moduli, G′ and G″, were measured in the frequency range 1-100 rad/s.…”

Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

“…On application of a field, the particles form strings or columns spanning the gap between the electrodes, as a result of interfacial polarization due to migration of charge carriers in the PANI particle [16]. As the electric field strength increases to a critical value, the ER fluid passes through a series of transformations [12]. Two characteristic transition points can be identified rheologically: the first is the sol-gel transition, characterized by the appearance of identical power law frequency scaling of the storage and loss moduli [17], and, subsequently, the liquid-to-solid transition associated with the crossover where G′ becomes larger than G″, the latter coinciding with the visible appearance of fibrillar structures [12,17].…”

Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

“…As the electric field strength increases to a critical value, the ER fluid passes through a series of transformations [12]. Two characteristic transition points can be identified rheologically: the first is the sol-gel transition, characterized by the appearance of identical power law frequency scaling of the storage and loss moduli [17], and, subsequently, the liquid-to-solid transition associated with the crossover where G′ becomes larger than G″, the latter coinciding with the visible appearance of fibrillar structures [12,17]. Figure 1 shows the change in G′(ω) and G″(ω) of the PANI/500 suspension as the applied field strength is increased.…”

Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

“…In this paper, we focus on a prediction of molecular dynamics simulations that the oscillatory shear moduli of an ER fluid exhibit a high-frequency relaxation process traced to motion of the polarizable spheres within thick fibrillar clusters [1]. In previous studies, the use of polyaniline (PANI), and other semiconducting polymers, as the dispersed phase in an ER fluid has been extensively explored [8,[10][11][12], since such polymers typically have a high intrinsic polarizability, even in the absence of any activator. PANI in particular has several advantages over other polymer particles such as low density, ease of synthesis and conductivity control, and thermal and environmental stability [4,13].…”

Section: Introductionmentioning

confidence: 99%

“…PANI in particular has several advantages over other polymer particles such as low density, ease of synthesis and conductivity control, and thermal and environmental stability [4,13]. In the linear viscoelastic regime, a PANI suspension typically shows a liquid to solid transition at a critical electric field strength, whose value depends on particle concentration and host fluid viscosity [12]. Such behavior is consistent with the idea that there are two opposing forces which influence the assembly of the polarizable particles into fibrillar structures spanning the electrodes, viz.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

Section: Electrorheological Properties and G′ ′-G″ ″ Crossover Of Panmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Highly Electroresponsive Polymer Blends of Polyaniline Nanoparticles and Chloroprene Rubbers

Kunanuruksapong

Sirivat

2012

Adv Polym Technol

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ABSTRACT:Polymer blends between polyaniline (PANI) nano/large particles and chloroprene rubbers were fabricated and investigated as the electroresponsive materials. The effects of the chloroprene type, particle size, particle concentration, and electric field strength on the electrical properties, the storage modulus sensitivity, and the dielectrophoresis force were studied. Chloroprene W provides the highest storage modulus sensitivity at 55% and is chosen as the matrix. The electrical conductivity and the dielectric constant of the blends increase with an increasing concentration of PANI nano/large particles. The storage modulus of the blends (with and without the electric field) increases linearly with the PANI content. The maximum storage modulus sensitivities of the blends with PANI nano and large particles at E = 2 kV/mm are 73% at 0.01 vol% and 63% at 0.1 vol%, respectively. The dielectrophoresis force of all specimens increases monotonically with increasing electric field strength. The blends with PANI-nano and large particles at 0.01 vol% generate higher dielectrophoresis forces than those of the pure chloroprene W. For the 0.1 vol% of PANI nano and large particles, the resultant deflection angle and dielectrophoresis forces are lower than those of the 0.01 vol% systems and the pure chloroprene W, presumably due to the diminishing resultant dipole moments generated with increasing PANI concentration. C 2012 Wiley

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Electrorheology and characterization of acrylic rubber and lead titanate composite materials

Tangboriboon

Sirivat

Wongkasemjit

2008

Applied Organom Chemis

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Oxide one-pot synthesis was used to synthesize a polymer precursor to lead titanate, PbTiO 3 . Perovskite lead titanate, PbTiO 3 , was synthesized via the sol-gel process. The dielectric constant, electrical conductivity and loss tangent of our acrylic rubber (AR71)-lead titanate (PT) composite material (AR/PT 8) were 14.15, 2.62 × 10 −7 / m, and 0.093, respectively, measured at 27• C and 1000 Hz. SEM micrographs of composites between the AR71 elastomer and PbTiO 3 showed that the particles were reinforced within the matrix. The electrorheological properties of the AR71/PT composites were investigated as functions of electric field strength from 0 to 2 kV/mm and PbTiO 3 particle volume fraction. The storage modulus increased linearly with particle volume fraction, with or without an electric field. Without an electric field, the particles merely acted as a filler to absorb or store additional stress. With the electric field on, particle-induced dipole moments were generated, leading to interparticle interactions, and thus a substantial increase in storage modulus. With PbTiO 3 particle volume fractions as small as 10 −4 embedded in the elastomer matrix, the modulus increased by nearly a factor of 2 as the electric field strength varied from 0 to 2 kV/mm.

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Electrorheological properties of polyaniline suspensions: Field-induced liquid to solid transition and residual gel structure

Cited by 59 publications

References 35 publications

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

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

Highly Electroresponsive Polymer Blends of Polyaniline Nanoparticles and Chloroprene Rubbers

Electrorheology and characterization of acrylic rubber and lead titanate composite materials

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