Polyaniline coated ZnFe2O4 microsphere and its electrorheological and magnetorheological response

Kim, Hyun Min; Kang, Su Hyung; Choi, Hyoung Jin

doi:10.1016/j.colsurfa.2021.127079

Cited by 10 publications

(8 citation statements)

References 46 publications

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“…The slope (m) of the ZnFe 2 O 4 /PIn particle-based ER fluid was 1.5, corresponding to the conductivity model. On the other, when this yield stress is compared with that of ZnFe 2 O 4 /polyanilinebased EMR fluid, it showed a slope of 1.5 corresponding to the conductivity model in the same way as the ZnFe 2 O 4 /PIn-based EMR fluid.On the other hand, the yield stress corresponding to each electric field is higher in ZnFe 2 O 4 /PIn, indicating that the ER effect is excellent in this study[35]. In addition, compared to the emulsion-polymerized PIn nanoparticle-based ER fluid of the maximum electric field strength of 2.5 kV/mm, the ZnFe 2 O 4 /PIn particle-based ER fluid in this study could tolerate 4.0 kV/mm because the thin layer of PIn in the core-shell structure possesses a better semi-conducting conductivity value for the ER fluid[36].Figure10shows G and G measured under various electric fields as applied with the ω varying from 1 to 200 rad/s.…”

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confidence: 55%

“…On the other, when this yield stress is compared with that of ZnFe 2 O 4 /polyaniline-based EMR fluid, it showed a slope of 1.5 corresponding to the conductivity model in the same way as the ZnFe 2 O 4 /PIn-based EMR fluid. On the other hand, the yield stress corresponding to each electric field is higher in ZnFe 2 O 4 /PIn, indicating that the ER effect is excellent in this study [ 35 ]. In addition, compared to the emulsion-polymerized PIn nanoparticle-based ER fluid of the maximum electric field strength of 2.5 kV/mm, the ZnFe 2 O 4 /PIn particle-based ER fluid in this study could tolerate 4.0 kV/mm because the thin layer of PIn in the core-shell structure possesses a better semi-conducting conductivity value for the ER fluid [ 36 ].…”

Section: Resultsmentioning

confidence: 83%

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Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Kang

Choi

2021

Materials

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ZnFe2O4 particles initially synthesized through a simple solvothermal method were coated using polyindole (PIn) to prepare an actively controllable core-shell typed hybrid material under both electric and magnetic fields. An advantage of this process is not needing to add the stabilizers or surfactants commonly used for uniform coating when synthesizing core or shell-structured particles. The synthesized ZnFe2O4/PIn particles have a lower density than conventional magnetic particles and have suitable properties as electrorheological (ER) particles. The expected spherical shape of the particles was proven using both scanning electron microscopy and transmission electron microscopy. The chemical characterization was performed using Fourier-transform infrared spectroscopy and X-ray diffraction analysis. To analyze the rheological properties, a ZnFe2O4/PIn based suspension was prepared, and dynamic rheological measurements were performed for different electric field strengths using a rotary rheometer. Both dynamic and elastic yield stresses of the ER fluid had a slope of 1.5, corresponding to the conductivity model. Excellent ER effect was confirmed through rheological analysis, and the prepared ER fluid had a reversible and immediate response to repeated electric fields.

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confidence: 55%

Section: Resultsmentioning

confidence: 83%

Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Kang

Choi

2021

Materials

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“…Choi's team uses PDMA to coat PS and the shear stress of poly(2,5‐dimethoxyaniline) coating polystyrene microspheres is closed to 100 Pa. [ 30 ] Gao's team reports the preparation of PANI and BaTiO 3 composite nanotube, in which ER fluid possesses the shear stress about 100 Pa. [ 31 ] In recent years, there are also many core–shell structure materials about ER material. Choi's team also prepares core–shell structured ZnFe 2 O 4 /PANI microspheres, in which the shear stress can reach to 100 Pa. [ 32 ] Lu's team creates an ER sensor by SM@FN composite material, which has high sensitivity and selectivity. [ 33 ] Giant electrorheological fluid is a new breakthrough for ER materials.…”

Section: Resultsmentioning

confidence: 99%

Electrorheological Response Behavior of PANI@MoS₂ Core–Shell Nanocomposites

Chen

Wang

et al. 2023

Adv Eng Mater

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Electrorheological (ER) fluid, as an intelligent material, is a kind of suspension composed of polarized micro‐ and/or nanoparticles dispersed into insulating oil. In recent years, molybdenum disulfide (MoS2), as the hottest 2D material, has provided a new strategy to develop the high‐performance ER materials. 2D‐based ER composites can provide large surface to enhance the polarization. But the MoS2 ER material has many disadvantages such as low polarization strength and high electrical conductivity. To make up these defects, polyaniline (PANI) is used to combine with lamellar MoS2. Herein, PANI and MoS2 hybrid composite nanoparticles with special morphology are prepared by two‐step method. The coating material has special morphology, high interfacial polarization, specific surface area, and low density. The optimum reaction ratio is obtained by adjusting the proportion of MoS2 and PANI. When the proportion of PANI and MoS2 is 4:1, the material performance is best, in which the shear stresses can reach 150 Pa. In a word, it is proved that the material is an excellent electrorheological material.

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“…The addition of mesoporous silica reduced its conductivity from 5.6 to 2.8 × 10 –9 S cm –1 , resulting in ER fluids with outstanding ER performance and excellent sedimentation stability . Similarly, the conductivity of two-dimensional (2D) molybdenum sulfide coated with silica or zinc ferrite (ZnFe 2 O 4 ) coated with PANI can be reduced, making novel composite particles with moderate conductivity very appealing for ER fluids. Silica can also be used for the preparation of mesoporous or microporous carbonaceous structures with significantly different specific surface areas and ER effects .…”

Section: Introductionmentioning

confidence: 99%

Engineering Conductivity and Performance in Electrorheological Fluids Using a Nanosilica Grafting Approach

Pavlikova,

Plachy,

Urbanek

et al. 2023

ACS Appl. Nano Mater.

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Carbonization is considered an effective process for the preparation of carbon-rich solids for various applications. Raw carbonaceous particles however often possess high electrical conductivity, limiting their applicability in electrorheology. To address this drawback, the carbonaceous particles prepared from glucose through hydrothermal synthesis, followed by thermal carbonization in an inert atmosphere, were subsequently coated by compact and mesoporous nanosilica, giving rise to semiconducting particles. The successful coating was confirmed using transmission electron microscopy and spectroscopic analysis, and the composite particles were further used as a dispersed phase in electrorheological (ER) fluids of concentration 5 wt %. While an ER fluid based on pure carbonized particles caused a short circuit of the measuring device at the electric field of intensity 1 kV mm–1, the ER behavior of its analogue based on mesoporous silica-coated particles was successfully measured up to 3 kV mm–1, giving a high yield stress exceeding even the values estimated for ER fluids based on similar carbonaceous particles coated with a compact silica layer. Even though the conductivity decreased only about one order of magnitude after the coating process, the dielectric properties of the prepared ER fluid differed significantly, the relaxation process was shifted to lower frequencies, and most importantly, the dielectric relaxation strength increased, indicating an increased amount of interactions. The presence of mesoporous nanosilica further enhanced the sedimentation stability of the ER fluids when compared to its analogue with the compact silica coating, expanding the scope of practical applicability.

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Polyaniline coated ZnFe2O4 microsphere and its electrorheological and magnetorheological response

Cited by 10 publications

References 46 publications

Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Electrorheological Response Behavior of PANI@MoS₂ Core–Shell Nanocomposites

Engineering Conductivity and Performance in Electrorheological Fluids Using a Nanosilica Grafting Approach

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Polyaniline coated ZnFe2O4 microsphere and its electrorheological and magnetorheological response

Cited by 10 publications

References 46 publications

Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Dynamic Response of Polyindole Coated Zinc Ferrite Particle Suspension under an Electric Field

Electrorheological Response Behavior of PANI@MoS2 Core–Shell Nanocomposites

Engineering Conductivity and Performance in Electrorheological Fluids Using a Nanosilica Grafting Approach

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Electrorheological Response Behavior of PANI@MoS₂ Core–Shell Nanocomposites