有机分子修饰铁粒子表面改善水基磁流变液的抗氧化性和稳定性

采用有机分子N-葡萄糖基乙二胺三乙酸(GED3A)修饰羰基铁(CI)粒子表面的方法, 制备了复合磁性粒子(CMPs)和水基磁流变(MR)液; 用扫描电镜(SEM)、振动样品磁强计(VSM)和带磁场供应和控制器的流变仪表征了CMPs及水基MR液的性能; 同时, 通过稳定性试验、空气氧化试验、酸腐蚀试验分别分析了水基MR液的分散稳定性和抗氧化性. 结果表明, 用此方法制备的CMPs具有良好的软磁性能, 饱和磁化强度(Ms)为182.2 emu·g-1, 矫顽力(Hc)为4.17 Oe, 剩磁(Mr)为0.1944 emu·g-1. 与原CI粒子水基MR液比较, 制备的水基MR液的沉降率下降了约24.4%; 在酸的浓度为0.02-0.10 mol·L-1范围内, 抗HCl氧化的能力提高了92.6%-95.7%, 抗HNO3氧化的能力提高了86.1%-93.8%.

Stability and Anti-Oxidization of Aqueous MR Fluids Improved by Modifying Iron Particle Surface with Organic Molecule

N-glucose ethylenediamine triacetic acid (GED3A) was used to modify the surface of carbonyl iron (CI) particles for preparing composite magnetic particles (CMPs) and aqueous magnetorheologic (MR) fluids. The properties of the obtained CMPs, including morphology, magnetic property, and anti-oxidation ability, were characterized by scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The magnetorheologic properties of aqueous MR fluids were measured using a commercial rheometer equipped with a magnetic field supplier and controller. Meanwhile, the dispersion stability and the anti-oxidation ability of the prepared aqueous MR fluids were also analyzed via stability test, air oxidation test, and acid corrosion test, respectively. The results are shown in below. (i) The CMPs possess better soft magnetic properties (magnetic saturation (Ms ): 182.2 emu·g-1, coercivity (Hc ): 4.17 Oe, remanence (Mr): 0.1944 emu·g-1. (ii) Compared with the aqueous MR fluid based on CI particles, the dispersion stability, anti-oxidation ability, and magnetorheological effect of the aqueous MR fluid based on the CMPs were substantially improved. The sedimentation ratio dropped by about 24.4%; and in the range of 0.02-0.10 mol·L-1 of acids, the anti-oxidation ability increased by 92.6%-95.7%for HCl, and 86.1%-93.8%for HNO3.