3O4@SiO2 nanoparticle additives and its magnetorheological property">

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首頁> 外文會議>2015 IEEE Magnetics Conference >Carbonyl iron suspension with core-shell structured Fe3O4@SiO2 nanoparticle additives and its magnetorheological property
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Carbonyl iron suspension with core-shell structured Fe3O4@SiO2 nanoparticle additives and its magnetorheological property

機譯：核殼結(jié)構(gòu)Fe 3 O 4 @SiO 2 納米粒子添加劑的羰基鐵懸浮液及其磁流變性質(zhì)

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Magnetorheological (MR) fluids are known to be colloidal suspensions of magnetic particles dispersed in nonmagnetic fluid, are capable of being solid-like under applied magnetic field and liquid-like by removing the magnetic field [1-3]. Their rheological properties such as yield stress and shear viscosity can reversibly and instantly be changed as a result of dispersed magnetic particles building up chain-like structure under a magnetic field due to magnetic dipole-dipole interaction between particles, and this phenomenon has great potential in designing diverse high performance engineering products including active damper system, torque transducer and MR polishing equipment [4-6]. Generally, high yield stress and low apparent viscosity without magnetic field as well as good stability and durability have become very crucial factors for the MR fluid application. Among various magnetic materials, carbonyl iron (CI) particles have been adopted as a superior candidate for MR fluids due to their high saturation magnetization as well as their appropriate particle size. However, the large density mismatch between CI particles and medium oil leads to serious sedimentation drawback. Therefore, many strategies have been explored to solve this problem [7, 8].
機譯：磁流變（MR）流體是分散在非磁性流體中的磁性顆粒的膠體懸浮液，在施加的磁場下能夠呈固體狀，而通過去除磁場而呈液體狀[1-3]。由于粒子之間的磁偶極-偶極相互作用，分散的磁性粒子在磁場下形成鏈狀結(jié)構(gòu)，其流變特性（如屈服應(yīng)力和剪切粘度）可以可逆地立即改變。設(shè)計了各種高性能工程產(chǎn)品，包括主動阻尼系統(tǒng)，扭矩傳感器和MR拋光設(shè)備[4-6]。通常，高屈服應(yīng)力和低表觀粘度（無磁場）以及良好的穩(wěn)定性和耐久性已成為MR流體應(yīng)用中非常關(guān)鍵的因素。在各種磁性材料中，由于羰基鐵（CI）顆粒的高飽和磁化強度和合適的粒徑，已被用作MR流體的優(yōu)良候選材料。但是，CI顆粒和中油之間的大密度失配會導(dǎo)致嚴重的沉降缺陷。因此，已經(jīng)探索了許多策略來解決這個問題[7，8]。

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