Magnetorheology of colloidal dispersion containing Fe nanoparticles synthesized by the arc-plasma method
Magnetorheology of colloidal dispersion containing Fe nanoparticles synthesized by the arc-plasma method
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DOI：
10.1016/j.jmmm.2009.12.043
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发表时间：
2010-07
影响因子：
2.7
通讯作者：
J. Noma;H. Abe;T. Kikuchi;J. Furusho;M. Naito
中科院分区：
文献类型：
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作者：
J. Noma;H. Abe;T. Kikuchi;J. Furusho;M. Naito
在Ar-50%H_2电弧等离子体中合成了直径约为100 nm的球形Fe纳米粒子。将这些纳米粒子分散在硅油中，然后在生长的薄氧化物层（约2nm）上进行硅烷处理以使其表面疏水。所得Fe纳米粒子在室温下表现出高达190 emu/g的饱和磁化强度。用平行板式流变仪测定了室温下0-0.3T磁通密度下胶体分散液（固含量15vol%）的静态磁流变行为。屈服应力随磁通密度的增加而不断增大，表现出宾汉塑性行为。此外，使样品经受0.3T的磁通量密度使屈服应力增加了1002。此外，胶体分散体表现出良好的抗沉降稳定性。
Spherical crystalline Fe nanoparticles, ∼100nm in diameter, were synthesized under Ar–50% H2arc-plasma. These nanoparticles were dispersed in silicone oil after silane treatment on as-grown thin oxide layer (∼2nm) to make their surfaces hydrophobic. The resulting Fe nanoparticles exhibited a high saturation magnetization of ∼190emu/g at room temperature. The static magnetorheological behavior was measured for the colloidal dispersion (solid concentration: 15vol%) at room temperature under magnetic flux densities of 0–0.3T, using a parallel-plate-type commercial rheometer. The yield stress continuously increased with magnetic flux density, demonstrating the Bingham plastic behavior. Moreover, subjecting the sample to a magnetic flux density of 0.3T increased the yield stress by ∼102. Additionally, the colloidal dispersion exhibited good stability against sedimentation.