Lee Seungae, Shin Keun-Young, Jang Jyongsik
School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, Korea.
Nanoscale. 2015 Jun 7;7(21):9646-54. doi: 10.1039/c4nr07168a.
Magnetic carbon nanoparticles (MC NPs) are prepared on a multi-gram scale through carbonization of iron-doped polypyrrole nanoparticles (PPy NPs). Three different-sized MC NPs (ca. 40, 60 and 90 nm) are prepared and adopted as dispersing materials for magnetorheological (MR) fluids to investigate the influence of particle size on MR properties. The MC NP-based MR fluids exhibit outstanding MR performances compared to the conventional magnetic carbon material-based fluids. In addition, the MR activities are enhanced with decreasing particle diameter and increasing applied magnetic field strength. Furthermore, anti-sedimentation properties are examined in order to achieve in-depth insight into the effect of the particle size on MR fluids.
磁性碳纳米颗粒（MC NPs）通过铁掺杂聚吡咯纳米颗粒（PPy NPs）的碳化以多克规模制备。制备了三种不同尺寸的MC NPs（约40、60和90纳米），并将其用作磁流变（MR）流体的分散材料，以研究粒径对MR性能的影响。与传统的磁性碳材料基流体相比，基于MC NPs的MR流体表现出优异的MR性能。此外，随着粒径减小和外加磁场强度增加，MR活性增强。此外，还研究了抗沉降性能，以便深入了解粒径对MR流体的影响。
