Synthesis and electrorheology of camphorsulfonic acid doped polyaniline suspensions

Jang, Woori; Kim, J. W.; Choi, Hyoung Jin; Jhon, Myung S.

doi:10.1007/s003960100534

Cited by 67 publications

(39 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, due to their oxidation state these magnetic particles are not easily affected by the corrosion under acidic conditions compared to the CI particles [12]. Concurrently, as an electroresponsive material, polyaniline (PANI), has been investigated extensively in ER systems [13][14][15] because of its easy synthesis, good thermal stability, low cost, and reversible doping/dedoping process to control the conductivity. Both ER and MR fluids have been studied extensively but there are only a few reports on electrorheological/magnetorheological (EMR) suspensions.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Sim¹,

Chae²,

Choi³

2015

Express Polym. Lett.

Self Cite

View full text Add to dashboard Cite

Abstract. Polyaniline (PANI)-coated iron oxide (Fe 3 O 4 ) sphere particles were fabricated and applied to a dual stimuliresponsive material under electric and magnetic fields, respectively. Sphere Fe 3 O 4 particles were synthesized by a solvothermal process and protonated after acidification. The aniline monomer tended to surround the surface of the Fe 3 O 4 core due to the electrostatic and hydrogen bond interactions. A core-shell structured product was finally formed by the oxidation polymerization of PANI on the surface of Fe 3 O 4 . The formation of Fe 3 O 4 @PANI particles was examined by scanning electron microscope and transmission electron microscope. The bond between Fe 3 O 4 and PANI was confirmed by Fourier transform-infrared spectroscope and magnetic properties were analyzed by vibration sample magnetometer. A hybrid of a conducting and magnetic particle-based suspension displayed dual stimuli-response under electric and magnetic fields. The suspension exhibited typical electrorheological and magnetorheological behaviors of the shear stress, shear viscosity and dynamic yield stress, as determined using a rotational rheometer. Sedimentation stability was also compared between Fe 3 O 4 and Fe 3 O 4 @PANI suspension.

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Sim¹,

Chae²,

Choi³

2015

Express Polym. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…After the course of polymerization, the precipitate was then dedoped by immersion in 3% NH 4 OH in order to adjust its conductivity, before being vacuum dried and passed through a 38 μm sieve shaker to control the particle size and its distribution. To determine the electrical conductivity, PANI powder was pressed into disk pellets by a hydraulic press (diameter of 25 mm and ~0.2 mm thick).…”

Section: Polymerization Proceduresmentioning

confidence: 99%

“…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]. A dimensionless parameter, the Mason number (Mn), has been widely used to describe the relative importance of hydrodynamic to electrostatic polarization forces, and has been shown to be useful to predict the ER suspension behavior in steady shear [5].…”

Section: Introductionmentioning

confidence: 99%

“…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]. 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].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Hiamtup¹,

Sirivat²,

Jamieson³

2008

Express Polym. Lett.

View full text Add to dashboard Cite

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 .

show abstract

“…Among them, semi-conducting polymers, such as polyaniline (PANI), polypyrrole, polythiophene, poly-p-phenylene and various copolymers have been shown to be most promising [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Especially the structured particles with different core/shell dielectric properties have been objects of recent investigation [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Polyaniline Content Deposited on Silica Gel Particles on the Electrorheology of Silicone-Oil Suspensions

Pavlı́nek

Sáha

Kitano

et al. 2005

Int. J. Mod. Phys. B

View full text Add to dashboard Cite

Investigation of the electrorheological effect of silicone-oil suspensions of silica particles coated with polyaniline base in a DC electric field revealed that breaking stress, as a criterion the intensity of the electrorheological phenomenon, steeply increased at first with coating thickness. At relatively low polyaniline content (volume fraction'" 0.05), it has reached a value several times higher than that with suspension of pure silica. Then they became virtually constant or slightly increased. The frequency spectra of dielectric characteristics of these systems reflect high relaxation times. The results suggest that the interfacial polarization of particles is predominantly controlled by polarizabiJity of their surface layer, and the influence of the thickness is of secondary importance.

show abstract

Synthesis and electrorheology of camphorsulfonic acid doped polyaniline suspensions

Cited by 67 publications

References 0 publications

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

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

The Effect of Polyaniline Content Deposited on Silica Gel Particles on the Electrorheology of Silicone-Oil Suspensions

Contact Info

Product

Resources

About