Electrorheological response of mesoporous expanded perlite particles

Çabuk, Mehmet

doi:10.1016/j.micromeso.2017.03.044

Cited by 16 publications

(10 citation statements)

References 27 publications

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“…Electrorheological (ER) fluids are a type of intelligent and smart material, generally consisting of electrically polarizable or semi-conducting materials dispersed in an insulating medium, which are in a fluid-like state in the absence of an electric field and exhibit an almost instantaneous transition to a solid-like state under an applied external electric field [ 1 , 2 ]. Under the application of an external electric field, the initially freely and randomly dispersed particles in the ER fluids aggregate and form chain-like structures [ 3 ], which undergo deformation and destruction in a shear flow perpendicular to the electric field and recombine continuously in an applied external electric field.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Dong¹,

Han²,

Choi³

2018

Polymers

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“…This indicated the solidification ability of the EP particles. When the strain exceeded the LVE, its storage modulus decreased because the chain-like microstructure of the ER suspension was deformed and broken, decreasing the G ′ and G ″; this is known as strain softening, also called the Payne effect [ 53 , 54 ]. In the high strain region, its G ″ was larger than its G ′, which meant that the ER suspension exhibited viscoelastic fluid properties.…”

Section: Resultsmentioning

confidence: 99%

Magnetite/Poly(ortho-anisidine) Composite Particles and Their Electrorheological Response

Lee

Choi

2021

Materials

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Magnetic and semiconducting Fe3O4/poly(o-anisidine) (POA) core/shell composite particles were fabricated by an oxidation process using Fe3O4 synthesized separately. The dispersion stability in a liquid medium and the electrical conductivity of synthesized particles were improved because of the conductive POA polymeric shell. The morphological, microstructural, compositional/elemental, and thermal behaviors of the particles were characterized using SEM with energy dispersive X-ray spectroscopy, TEM, XRD, and thermogravimetric analysis, respectively. A smart electro-magneto-rheological suspension containing Fe3O4/POA particles with two functionalities, magnetism and conductivity, was prepared. Its electrorheological properties were investigated at different electric field strengths using a rotational rheometer. Without an electric field, the sample demonstrated typical Newtonian fluid behavior, as expected. However, while under the electric field, it exhibited a solid-like behavior, and the dynamic (or elastic) yield stress of the ER fluid increased linearly as a function of the electric field strength in a power-law function with an index of 2.0, following the polarization mechanism.

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“…Also, the problem associated with sedimentation of colloidal particles, as well as the lack of high-performance materials, has inhibited broad engineering applications [13,14]. Giant ER fluids like other traditional ER fluids exhibit sedimentation drawback due to the density mismatch of the fluid and solid phases as well as the aggregation of the dispersed particles [15,16]. To improve the sedimentation stability of the ER fluids, several methods have been developed.…”

Section: Introductionmentioning

confidence: 99%

“…The antisedimentation property enhanced dramatically in silicone oil due to multiwall carbon nanotubes. Cabuk et al [16] reported ER response and temperature effect on antisedimentation stability of expanded perlite particles in silicone oil. The expanded perlite particles as porous ultra-lightweight materials showed typical ER properties under applied E, exhibiting a shear thinning non-Newtonian viscoelastic behavior (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

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Dual Response of Materials under Electric and Magnetic Fields

Çabuk¹

2019

Smart and Functional Soft Materials

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The electrorheological (ER) effect is known as the change in the rheological behaviors of ER fluids under applied electric field E. When an E is imposed, ER fluids show phase transition from a liquid to a solid-like state due to the interactions of polarized particles. This solid-like behavior of particles is due to the increasing viscosity of suspensions. ER materials belong to a family of controllable fluids. ER fluids are dispersions of solid particles in a hydrophobic insulating dispersion medium. These solid particles play a very important role in the ER activity of dispersions. As the dispersed phase, diverse materials such as polymer blends, gels, biodegradable materials, clays, graphene oxide, hybrid nanocomposites, copolymers, ionic liquids, and conducting polymers have been proposed. In the magnetorheological fluids, this control is provided with magnetic field. Various magnetic particles such as carbonyl iron and iron oxides have been suggested as MR material. The combined effect of magnetic and electric field produces intensified rheological changes in the suspensions. This synergic effect is termed as electromagnetorheological effect (EMR). The EMR effect provides a new strategy to control the rheological properties of dispersions.

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Electrorheological response of mesoporous expanded perlite particles

Cited by 16 publications

References 27 publications

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

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

Magnetite/Poly(ortho-anisidine) Composite Particles and Their Electrorheological Response

Dual Response of Materials under Electric and Magnetic Fields

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