Ultrathin polydimethylsiloxane-coated carbonyl iron particles and their magnetorheological characteristics

Kim, Yoon-Hyun; Lee, Jung-Eun; Cho, Seok-Ki; Park, Seong-Yong; Jeong, Inbum; Jeong, Myung-Geun; Kim, Young Dok; Choi, Hyoung Jin; Cho, Sung Min

doi:10.1007/s00396-012-2667-1

Cited by 15 publications

(8 citation statements)

References 20 publications

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“…The second disadvantage is insufficient thermal stability of the iron particles, whose oxidation aer they are exposed to the elevated temperature considerably decreases the magnetorheological properties. 38 Thus, the modication of the particles especially, using various polymers [39][40][41] is usually applied.…”

Section: Introductionmentioning

confidence: 99%

Novel synthesis of core–shell urchin-like ZnO coated carbonyl iron microparticles and their magnetorheological activity

et al. 2014

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An international journal to further the chemical sciencesRSC Advances is an international, peer-reviewed, online journal covering all of the chemical sciences, including interdisciplinary fields.The criteria for publication are that the experimental and/ or theoretical work must be high quality, well conducted adding to the development of the field.Thank you for your assistance in evaluating this manuscript. Guidelines to the refereesReferees have the responsibility to treat the manuscript as confidential. Please be aware of our Ethical Guidelines, which contain full information on the responsibilities of referees and authors, and our Refereeing Procedure and Policy.It is essential that all research work reported in RSC Advances is well-carried out and wellcharacterised. There should be enough supporting evidence for the claims made in the manuscript. When preparing your report, please:• comment on the originality and scientific reliability of the work • state clearly whether you would like to see the article accepted or rejected and give detailed comments (with references, as appropriate) that will both help the Editor to make a decision on the article and the authors to improve it Please inform the Editor if:• there is a conflict of interest • there is a significant part of the work which you are not able to referee with confidence • the work, or a significant part of the work, has previously been published • you believe the work, or a significant part of the work, is currently submitted elsewhere • the work represents part of an unduly fragmented investigationFor further information about RSC Advances, please visit: www.rsc.org/advances or contact us by email: advances@rsc.org. Enclosed please find the manuscript entitled "Novel synthesis of core-shell urchin-like ZnO coated carbonyl iron microparticles with enhanced magnetorheological activity". The paper is intended for publication in RSC advances if you consider it suitable. We believe that this article describing novel synthesis of inorganic-inorganic core-shell particles with unique urchin-like morphology having extraordinary rheological properties under applied magnetic field and further, exhibiting considerably enhanced sedimentation and thermo-oxidation stability with great potential in wide areas of industrial applications. We also hope that article is matching with the scope of your journal categories "Inorganic" and "Rheology and colloids" and is attractive enough in the same time. Sincerely yours Miroslav Mrlík et al. (Corresponding author)E-mail: mrlik@ft.utb.cz tel: +420 57 603 8128, fax: +420 576 031 444 ABSTRACTThe overall stability (thermo-oxidation, sedimentation) of the MR suspensions is a crucial problem decreasing their potential applicability in the real life. In this study the unique functional coating of carbonyl iron (CI) particles with ZnO structures was presented in order to develop new MR suspension based on the core-shell ZnO/CI urchin-like dispersed particles. The two-step synthesis provides the suitable core-shell particles wit...

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Section: Introductionmentioning

confidence: 99%

Novel synthesis of core–shell urchin-like ZnO coated carbonyl iron microparticles and their magnetorheological activity

et al. 2014

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“…A rapid oxidation of these particles occurs above 400 C, implying a decomposition of the 3APTS layer. 9,23 Another important factor for the efficient utilization of these smart systems in real applications is the anti-acid-corrosion resistance of magnetic particles used in MR suspensions, since the corrosion of particles over time leads to the formation of less-magnetic products, resulting in the decreased MR performance of the whole device. As can be observed in Fig.…”

Section: Benets Of a Polymeric Surface Layermentioning

confidence: 99%

A tensiometric study of magnetorheological suspensions' stability

Sedlačík

Pavlı́nek

2014

RSC Adv.

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A thin (3-aminopropyl)triethoxysilane (3APTS) layer with a grafting density around 50 groups per nm 2 was coated onto soft magnetic carbonyl iron (CI) particles. Their physical characteristics were examined using various methods, and the results revealed that the coating layer did not affect the particles' morphology and magnetic properties while their resistance against thermal oxidation and chemical degradation was considerably improved. This study further evaluates the surface free energy of the particles under investigation using tensiometry, namely capillary rise experimental methods based on the Washburn theory. The dispersive and polar components of surface free energy were subsequently computed through the application of the Owens-Wendt-Rabel-Kaeble theory. It was observed that the coating of CI particles with 3APTS increased the dispersive component of surface free energy, resulting in the improved compatibility of such particles with non-polar silicone oil which is used as a carrier liquid for magnetorheological (MR) suspensions. Furthermore, the 3APTS coating has a negligible influence on MR properties in comparison with an uncoated CI particle-based MR suspension, as was proved by steady shear and small-strain oscillatory shear tests under various external magnetic fields. The improved compatibility of 3APTS-coated CI particles with silicone oil was reflected in the better sedimentation stability of the MR suspension, observed via tensiometry for the first time for MR suspensions, in comparison with the uncoated CI particle-based suspension.

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“…MREs are based on silicone rubber, carbonyl iron particles (CIPs) and silicone oil [ 7 , 8 , 9 , 10 ]. CIPs are commonly used because of their high magnetization value (up to 2.1 Tesla), high magnetic permeability, soft magnetic characteristics, low residual magnetization and universal availability [ 11 , 12 ]. Almost all research done up until now regarding MREs focused on studying the influence that CIPs have on the physical behavior of the rubber matrix.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Magnetorheological Behavior of PDMS Elastomer Reinforced with Iron Micro/Nanoparticles

et al. 2017

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Abstract:The aim of this article focuses on identifying how the addition of iron micro-and nanoparticles influences the physical properties of magnetorheological composite materials developed with a polydimethylsiloxane (PDMS) matrix with different contents of silicone oil used as additive. A number of characterization techniques have been performed in order to fully characterize the samples, such as cyclic and uniaxial extension, rheology, swelling, Vibrating sample magnetometer (VSM), X-ray Diffraction (XRD), Scanning electron microscopy (SEM), Fourier-Transform Infrared (FTIR), X-ray photoelectronic spectroscopy (XPS) and Thermogravimetric analysis (TGA). The comparison between two matrices with different shore hardnesses and their mechanical and chemical properties are elucidated by swelling and tensile tests. In fact, swelling tests showed that higher crosslink density leads to increasing elongation at break and tensile strength values for the composite materials. The best mechanical performance in the magnetorheological material was observed for those samples manufactured using a higher silicone oil content in a hard polymeric matrix. Furthermore, it has been found that the magnetic properties are enhanced when nanoparticles are used as fillers instead of microparticles.

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Ultrathin polydimethylsiloxane-coated carbonyl iron particles and their magnetorheological characteristics

Cited by 15 publications

References 20 publications

Novel synthesis of core–shell urchin-like ZnO coated carbonyl iron microparticles and their magnetorheological activity

Novel synthesis of core–shell urchin-like ZnO coated carbonyl iron microparticles and their magnetorheological activity

A tensiometric study of magnetorheological suspensions' stability

Experimental Investigation of the Magnetorheological Behavior of PDMS Elastomer Reinforced with Iron Micro/Nanoparticles

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