Modeling and analysis of an electrorheological flow behavior containing semiconducting graphene oxide/polyaniline composite particles

Choi, Hyoung Jin; Lee, Jae Rock; Seo, Yongsok

doi:10.1016/j.colsurfa.2014.06.011

Cited by 28 publications

(37 citation statements)

References 20 publications

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“…18 [1 ] 1 p c c 2 4.6 (1 ) 3 (5) where V represents the particle migration velocity (m s −1 ), ρ p denotes the particle density (kg m −3 ), ρ c indicates the continuous phase density (kg m −3 ), ν designates the kinematic viscosity of continuous phase, g is gravity constant (9.81 m s −2 ), d stands for the particle diameter, and ϕ represents the volume fraction. 30 Apparently, the dispersed particles in all four suspensions settled rapidly within 2 h and tend to reach steady (stable) state.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…(1 exp( )) (1 ( ) ) pl sy (1) where τ sy denotes the static yield stress at which the suspension initiates flow, η pl is the plastic viscosity, a is the time constant (i.e., the reciprocal of the critical shear rate for an aligned mesostructure deformation), and α is the power-law index used to decide the degree of shear thinning. The effects of the Seo−Seo model parameters on the stress have been fully described previously.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…1 When the magnetic field is on, randomly dispersed particles can rapidly form fibril shapes (mesostructure) along the field direction due to magneto-polarization between the suspended particles. Reverse structural transition happens once the applied field is off.…”

Section: ■ Introductionmentioning

confidence: 99%

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Magnetorheology of Core–Shell Structured Carbonyl Iron/Polystyrene Foam Microparticles Suspension with Enhanced Stability

et al. 2015

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The sedimentation stability of a carbonyl iron (CI)-based magnetorheological (MR) fluid was improved by wrapping CI particles with a polystyrene (PS) foam layer. The PS layer on the CI particles was synthesized via conventional dispersion polymerization and was subsequently foamed using a supercritical carbon dioxide fluid to produce core−shell structured particles. The density of particles decreased after the PS-layer wrapping and subsequent PS-layer foaming. The surface morphology was observed by scanning electron microscope (SEM) and the specific surface areas were determined by Brunauer−Emmett−Teller (BET) adsorption measurements. Both modifications (PS-layer wrapping and foaming) increased the surface roughness of the particles, yet preserved particle's spherical shape. The effect of the volume expansion after modification on the magnetorheological properties was investigated by using a vibrating sample magnetometer (VSM) and a rotational rheometer. All suspensions tested presented similar MR behaviors with the only difference in their yield stress strengths. Finally, the sedimentation properties of the synthesized particles was examined using a Turbiscan apparatus. MR fluids containing the newly developed CI particles wrapped with the foamed PS layer exhibited remarkably improved stability against sedimentation due to the reduced mismatch in density between the particles and the carrier medium.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Magnetorheology of Core–Shell Structured Carbonyl Iron/Polystyrene Foam Microparticles Suspension with Enhanced Stability

et al. 2015

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“…The valve mode includes stationary poles and fluids perpendicular to the direction of the magnetic field. The poles of the shear mode move parallel to the flow, and the force is in line with the direction of the magnetic field and the direction of the aggregate particle chain in the squeeze mode [ 70 , 71 ]. The shear mode is the most common rheological test mode used to measure the rheological properties of MR suspensions.…”

Section: Mr Characteristicsmentioning

confidence: 99%

Magnetic Polymer Composite Particles: Design and Magnetorheology

Choi

Nam

et al. 2021

Polymers

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As a family of smart functional hybrid materials, magnetic polymer composite particles have attracted considerable attention owing to their outstanding magnetism, dispersion stability, and fine biocompatibility. This review covers their magnetorheological properties, namely, flow curve, yield stress, and viscoelastic behavior, along with their synthesis. Preparation methods and characteristics of different types of magnetic composite particles are presented. Apart from the research progress in magnetic polymer composite synthesis, we also discuss prospects of this promising research field.

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“…By using a multi-layer composite method, Chen et al [ 115 ] coated a polypyrrole (PPy) layer and a PILs layer on the surface of GO in sequence and obtained a multi-layered composite material with low conductivity and high ER effect. Firstly, the PPy layer is coated by an in situ polymerization process [ 116 ]. Then 1, 4-dibromobutan and 1-vinylimidazole are grafted on the surface of GO/PPy in turn and finally a PILs layer is formed by radical polymerization.…”

Section: Poly(ionic Liquid)s and Their Compositesmentioning

confidence: 99%

The Electric Field Responses of Inorganic Ionogels and Poly(ionic liquid)s

et al. 2020

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Ionic liquids (ILs) are a class of pure ions with melting points lower than 100 °C. They are getting more and more attention because of their high thermal stability, high ionic conductivity and dielectric properties. The unique dielectric properties aroused by the ion motion of ILs makes ILs-contained inorganics or organics responsive to electric field and have great application potential in smart electrorheological (ER) fluids which can be used as the electro-mechanical interface in engineering devices. In this review, we summarized the recent work of various kinds of ILs-contained inorganic ionogels and poly(ionic liquid)s (PILs) as ER materials including their synthesis methods, ER responses and dielectric analysis. The aim of this work is to highlight the advantage of ILs in the synthesis of dielectric materials and their effects in improving ER responses of the materials in a wide temperature range. It is expected to provide valuable suggestions for the development of ILs-contained inorganics and PILs as electric field responsive materials.

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Modeling and analysis of an electrorheological flow behavior containing semiconducting graphene oxide/polyaniline composite particles

Cited by 28 publications

References 20 publications

Magnetorheology of Core–Shell Structured Carbonyl Iron/Polystyrene Foam Microparticles Suspension with Enhanced Stability

Magnetorheology of Core–Shell Structured Carbonyl Iron/Polystyrene Foam Microparticles Suspension with Enhanced Stability

Magnetic Polymer Composite Particles: Design and Magnetorheology

The Electric Field Responses of Inorganic Ionogels and Poly(ionic liquid)s

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