Electrorheology of Polyaniline-Coated Poly(methyl Methacrylate) Microsphere Suspensions in Silicone Oil

Choi, Hyoung Jin; Cho, Yun H.; Cho, Min S.

doi:10.1142/9789812777546_0087

Cited by 7 publications

(9 citation statements)

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“…Cho et al [120] prepared monodispersed PMMA spheres with a diameter of approximately 2 μm by the dispersion polymerization of methyl methacrylate (MMA) monomers in a methanol medium with 2,2-azobisisobutyronitrile (AIBN) as an initiator and PVP as a stabilizer, and then coated with PANI by the chemical oxidative polymerization of aniline monomers on the surface of PMMA using sodium dodecyl sulfate (SDS) as a surfactant. They examined the ER properties of this PANI-coated PMMA (PMMA/PANI) particle-based ER fluid.…”

Section: Polyaniline-coated Core-shell Structured Microspheresmentioning

confidence: 99%

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Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology

Dong¹,

Han²,

Choi³

2018

Polymers

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Functional core-shell-structured particles have attracted considerable attention recently. This paper reviews the synthetic methods and morphologies of various electro-stimuli responsive polyaniline (PANI)-coated core-shell-type microspheres, including PANI-coated Fe 3 O 4 , SiO 2 , Fe 2 O 3 , TiO 2 , poly(methyl methacrylate), poly(glycidyl methacrylate), and polystyrene along with their electrorheological (ER) characteristics when prepared by dispersing these particles in an insulating medium. In addition to the various rheological characteristics and their analysis, such as shear stress and yield stress of their ER fluids, this paper summarizes some of the mechanisms proposed for ER fluids to further understand the responses of ER fluids to an externally applied electric field.

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Section: Polyaniline-coated Core-shell Structured Microspheresmentioning

confidence: 99%

“…Cho et al [120] compared the parameters of Cole-Cole equation for different ER fluids. Figure 16 shows the Cole-Cole fitting results for ER fluids based on PANI (PA) and PMMA/PANI with a PANI shell thickness of 11 (PA-PMMA4) and 52 nm (PA-PMMA20).…”

Section: Dielectric Analysismentioning

confidence: 99%

Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology

Dong¹,

Han²,

Choi³

2018

Polymers

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“…ER fluids are one of the most interesting smart materials. They are suspension systems of dielectric/semi-conducting particles dispersed in nonpolar liquids, which construct fibrillated particle structures under applied external electric fields due to the difference in dielectric constant between the particles and the insulating oil [ 47 ], as shown in Figure 5 . In contrast, ER gels and ER elastomers have either an elastomer or gel suspension medium, respectively [ 48 ].…”

Section: Electrorheological Fluidsmentioning

confidence: 99%

Cellulose-Based Smart Fluids under Applied Electric Fields

et al. 2017

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Cellulose particles, their derivatives and composites have special environmentally benign features and are abundant in nature with their various applications. This review paper introduces the essential properties of several types of cellulose and their derivatives obtained from various source materials, and their use in electro-responsive electrorheological (ER) suspensions, which are smart fluid systems that are actively responsive under applied electric fields, while, at zero electric field, ER fluids retain a liquid-like state. Given the actively controllable characteristics of cellulose-based smart ER fluids under an applied electric field regarding their rheological and dielectric properties, they can potentially be applied for various industrial devices including dampers and haptic devices.

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“…A solution to this problem is to coat the surface of Fe 3 O 4 particles with polymers [ 23 , 24 ]. Meanwhile, among various polymers, when the conducting polymer is used in the form of a conductive shell-magnetic core, not only MR but also ER characteristics under an electric field can also be obtained [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Polymer-Magnetic Composite Particles of Fe3O4/Poly(o-anisidine) and Their Suspension Characteristics under Applied Magnetic Fields

Lee

et al. 2019

Polymers

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Fe3O4/poly(o-anisidine) (POA) magnetic composite nanoparticles with their core-shell structure were synthesized by chemical oxidation polymerization technique and adopted as a magneto-responsive magnetorheological (MR) material. The chemical structure and morphology of core-shell nanoparticles were identified by FT-IR, SEM, TEM, and elemental analyzer. Pycnometer and vibrating sample magnetometer showed that the magnetic saturation and density of the Fe3O4/POA particles were reduced by the POA shell coatings. The rheological properties of the MR suspension dispersed in a silicone oil at various magnetic field strengths were investigated using a rotating rheometer under a magnetic field. The resulting MR suspension showed a typical Newtonian fluid behavior in the absence of external stimuli. When an external magnetic field was applied, it formed a strong chain structure, acting like a solid with a yield stress. Further solid-like behaviors were observed from storage shear relaxation and viscoelastic tests. Finally, the Fe3O4/POA nanoparticles showed better dispersion stability than pure Fe3O4 nanoparticles with 50% improvement.

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Electrorheology of Polyaniline-Coated Poly(methyl Methacrylate) Microsphere Suspensions in Silicone Oil

Cited by 7 publications

References 0 publications

Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology

Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology

Cellulose-Based Smart Fluids under Applied Electric Fields

Polymer-Magnetic Composite Particles of Fe3O4/Poly(o-anisidine) and Their Suspension Characteristics under Applied Magnetic Fields

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