Electrorheological properties of chitosan suspension

Choi, Ung-su

doi:10.1016/s0927-7757(99)00051-5

Cited by 32 publications

(15 citation statements)

References 13 publications

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“…It follows from the fact that the interaction force for dipole in an electric field is proportional to the electric field intensity. The net effect will be that the interaction force and consequently the strength of the fluid are dependent on the square of the electric field [25].…”

Section: Change Of Shear Stress With Particle Size and Electric Fieldmentioning

confidence: 99%

Is vorticity-banding due to an elastic instability?

2008

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The electrorheological (ER) effect is commonly known as a reversible increase in the viscosity of a suspension of solid particles dispersed in an insulating liquid after application of an external electric field. In this study, ER properties of poly(Lithium-2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine), poly(Li-HEMA)-co-poly(4-VP), ionomeric salt (ionomer) was investigated. The ionomer particle sizes were characterized by dynamic light scattering, (DLS) method. Suspensions of ionomers were prepared in insulating silicone oil, at a series of concentrations (c = 5-30 %, m/m). Effects of particle size, temperature and concentration on the sedimentation stabilities of these suspensions were determined. Flow times of the suspensions were measured under no electric field (E = 0 kV/mm), and under an applied electric field (E 0 kV/mm) strength and a strong ER activity was observed for all the suspensions studied. Further, the effects of particle size, concentration, shear rate, electric field strength, frequency, promoter and temperature onto ER activities of ionomer suspensions were investigated.

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Section: Change Of Shear Stress With Particle Size and Electric Fieldmentioning

confidence: 99%

Is vorticity-banding due to an elastic instability?

2008

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“…[2][3][4][5] Typically, the steady-state rheological properties have been investigated for most ER fluids. [6][7][8][9][10][11][12][13][14] The steady-state rheological response in shearing flows is commonly modeled as a Bingham fluid, [15,16] with an electric field dependent yield stress, t y (E 0 ),…”

Section: Introductionmentioning

confidence: 99%

“…Typically, the steady‐state rheological properties have been investigated for most ER fluids 6–14. The steady‐state rheological response in shearing flows is commonly modeled as a Bingham fluid,15,16 with an electric field dependent yield stress, τ y ( E 0 ), where τ is the shear stress, τ y is the yield stress, E 0 is the applied field strength, η is the shear viscosity, and $\dot \gamma$ is the shear rate.…”

Section: Introductionmentioning

confidence: 99%

Scaling of Yield Stress of Polythiophene Suspensions under Electric Field

Chotpattananont

Sirivat

Jamieson

2004

Macro Materials & Eng

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Summary: Electrorheological properties in steady shear of perchloric acid doped poly(3‐thiopheneacetic acid), PTAA, particles in silicone oil were investigated to determine the effects of field strength, particle concentration, doping degree (conductivity values), operating temperature and nonionic surfactant. The PTAA/silicone oil suspensions show the typical ER response of Bingham flow behavior upon the application of electric field. The yield stress increases with electric field strength, E, and particle volume fraction, ϕ, according to a scaling law of the form, τy ∝ Eα · ϕγ. The scaling exponent α approaches the value of 2, predicted by the polarization model, as the particle volume fraction decreases and when the doping level of the particles decreases. The scaling exponent γ tends to unity, as predicted by the polarization model, when the electric field strength is low. The yield stress under electric field initially increases with temperature up to 25 °C, and then levels off. At electric fields above of 1.5 kV/mm, the yield stress increases significantly by up to 50% on addition of small amounts of a nonionic surfactant.

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“…Chitosan has polar amine and hydroxyl groups, thus, these polar groups may affect the electrorheological behavior by acting as electron donors under the imposed electric field 19 . Therefore, chitosan shows good electrorheological property without any treatment 20 . Besides, there is a good possibility for those polar groups in chitosan to be attached to various functional groups.…”

Section: Asian Journal Of Chemistry; Vol 26 No 21 (2014) 7239-7244mentioning

confidence: 99%

Synthesis and Characterization of Chitosan/Urea-Formaldehyde Hollow Resin for Metal Ion Removal

Abdelaal¹,

Bahaffi²,

El-Sayed³

2014

Asian J. Chem.

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In the current study, a series of hollow resins has been synthesized by using chitosan succinate and urea-formaldehyde resin as a cage resin to prepare new polychelates for different metal ions. Resins were characterized by FT-IR spectroscopy, thermal analysis and scanning electron microscopy. Resins have also been investigated for the removal of metal ions from their aqueous solutions through the formation of polychelates of the metal ions and their sorption capacity of such metal ions was determined. The hollow resin exhibited higher surface area than its separate components which facilitates higher ion uptake of metal ions from aqueous solutions.

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Electrorheological properties of chitosan suspension

Cited by 32 publications

References 13 publications

Is vorticity-banding due to an elastic instability?

Is vorticity-banding due to an elastic instability?

Scaling of Yield Stress of Polythiophene Suspensions under Electric Field

Synthesis and Characterization of Chitosan/Urea-Formaldehyde Hollow Resin for Metal Ion Removal

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