Encapsulation of Spherical Iron-Particle With PMMA and Its Magnetorheological Particles

Cho, M.S.; Lim, Sang Kyoo; Jang, I.B.; Choi, Hyoung Jin; Jhon, Myung S.

doi:10.1109/tmag.2004.830413

Cited by 145 publications

(56 citation statements)

References 10 publications

(9 reference statements)

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“…Concurrently, in MR fluids, magnetic particles, such as iron, iron oxides (Fe2O3 and Fe3O4), and carbonyl iron (CI), have been developed owing to their high saturation magnetization and suitable magnetic properties [50][51][52][53]. In addition, recent efforts on various composites with magnetic particles with different morphologies have been made to improve the stability of MR suspensions.…”

Section: Methodsmentioning

confidence: 99%

Stimuli-Responsive Polymers and Colloids under Electric and Magnetic Fields

Zhang¹,

Choi

2014

Polymers

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Electrorheological (ER) and magnetorheological (MR) suspensions undergo a reverse phase transition from a liquid-like to solid-like state in response to an external electric or magnetic field, respectively. This paper briefly reviews various types of electro-or magneto-responsive materials from either polymeric or inorganic and hybrid composite materials. The fabrication strategies for ER/MR candidates and their ER/MR characteristics (particularly for ER fluids) are also included.

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Section: Methodsmentioning

confidence: 99%

Stimuli-Responsive Polymers and Colloids under Electric and Magnetic Fields

Zhang¹,

Choi

2014

Polymers

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“…Cho et al (2004) obtained the low-density magnetic particles by coating CI particles with polymethyl methacrylate (PMMA). Qiao et al (2010) Jiang et al (2010) adopted coated poly (methyl methacrylate) (PMMA) to coat on the surface of CI particles in order to obtain composite CI-PMMA particles and discovered the prepared MR fluid based on CI-PMMA particles exhibited better sedimentation stability.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Tests of MR Fluids With CI Particles Coated With MWNTs

Guo

Sun

et al. 2018

Front. Mater.

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The magnetorheological (MR) fluid is a typical smart material, whose shear yield stress can be adjusted through changing the strength of external magnetic field, and the changing process only takes a few milliseconds. The MR fluid is composed of micro/nanometer ferromagnetic particles, carrier fluids, and some additives. Among them, the performance of ferromagnetic particles will mainly affect the sedimentation stability and the magnetic saturation of the MR fluid. Therefore, the ferromagnetic particles are expected to have characteristics of both low density and high magnetism. In this paper, the multi-walled carbon nanotubes (MWNTs) were adopted to coat on the carbonyl iron (CI) particles with grafting technology using ultrasonication and mechanical stirring. The coated CI particles with perfect core-shell structure were developed and the influence of the dosages of grafting agent and MWNTs were tested. And then, MR fluids with CI particles coated with MWNTs were established and the coating effect was studied through surface topography particle density, and magnetic properties of composite magnetic particles and stability tests of the prepared MR fluids. The results showed that although the magnetic saturation of the prepared MR fluids with CI particles coated with MWNTs would reduce slightly, the particles density and the adsorption force between the particles were decreased effectively, which are both advantageous to the improvement of the sedimentation stability of MR fluids.

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“…The shape of the coated carbonyl iron is mainly spherical. [19] In this work, the carbonyl iron micro-sized particles were coated with iron phosphate using phosphating method and with alumina or silica layers by the sol-gel method. The effect of type of coating on the morphology of carbonyl iron particles after drying and calcination at 400…”

Section: Introductionmentioning

confidence: 99%

The effect of iron phosphate, alumina and silica coatings on the morphology of carbonyl iron particles

Bruncková

Kabátová

Dudrová

2009

Surface & Interface Analysis

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Carbonyl iron powders were coated with iron phosphate using phosphating method and boehmite (γ -AlOOH) or silicon hydroxide (Si(OH) 4 ) nanoparticles derived from the hydrolysis of tri-sec-butoxide (Al(OC 4 H 9 ) 3 ) or tetramethylsilane (Si(OCH 3 ) 4 ) using sol-gel method. The coated powders were dried and calcined at 400• C for 3 h in air. Cross-section morphology of coated carbonyl iron powders were investigated by scanning electron microscopy energy dispersive X-ray analysis. Coated Fe micro-particles were spherical in shape with 'shell/core' structures. The shells consisted of an amorphous layer with varying thickness (100-800 nm) and the core represented a carbonyl iron.Gelatinous morphology of dried FePO 4 coating composed from nanoparticles of iron oxyhydroxides and hydrated iron phosphate with a shell thickness of ∼100 nm around iron particles was observed. In coatings based on alumina or silica xerogels with a thickness of ∼100-150 nm or ∼200-500 nm, the coatings were composed of iron oxyhydroxides and γ -AlOOH or Si(OH) 4 . The resulting XRD diffractograms revealed the hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) that were formed in phosphated and sol-gel coated iron powders. The X-ray diffraction patterns did not verify the presence of phosphates, alumina or silica and indicate the amorphous or nanocrystalline structure of FePO 4 , γ -Al 2 O 3 and SiO 2 .

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Encapsulation of Spherical Iron-Particle With PMMA and Its Magnetorheological Particles

Cited by 145 publications

References 10 publications

Stimuli-Responsive Polymers and Colloids under Electric and Magnetic Fields

Stimuli-Responsive Polymers and Colloids under Electric and Magnetic Fields

Preparation and Tests of MR Fluids With CI Particles Coated With MWNTs

The effect of iron phosphate, alumina and silica coatings on the morphology of carbonyl iron particles

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