摘要:
利用水解法与溶液沉积法, 合成了丙烯酰胺、十二烷基苯磺酸钠(SDBS) 改性氧化钛纳米电流变颗粒。经XRD 测定颗粒为无定形态, 用TEM 观察了粒子的形貌, 粒度分析表明颗粒粒径分布为70～300 nm , FTIR 图谱显示氧化钛上修饰有丙烯酰胺、SDBS。SDBS 的加入影响了颗粒的尺寸、表面性质及颗粒与硅油的润湿性, 最终引起电流变液介电性质的改善。丙烯酰胺的加入量也会影响电流变效应。电流变性能测试表明, 当SDBS/ 水质量比为1. 875 % , 丙烯酰胺/ 水质量比为0. 750 %时, 材料呈现最佳的电流变效应, 5 kV/ mm 直流电场下的静态剪切应力可达90 kPa , 电流变液具有极好的抗沉淀稳定性。这种优异的电流变效应源于颗粒界面极化的增强。
Abstract:
Acrylamide modified titanium oxide nano particles were prepared by combining the modified hydrolysisand solution deposition methods , using sodium dodecylbenzene sulphonate (SDBS) as the dispersing agent . XRD result shows that the nano particles are amorphous , and the size dispersion ranges f rom 70 nm to 300 nm characterizedby the laser particle size analyzer. FTIR pat terns show that acrylamide and SDBS are adsorbed on the surface of titanium oxide particles. The addition of SDBS affect s the size and the surface characterization of particles , and the wettability between particles and silicone oil , which sequentially leads to the improvement of dielect ric property. Anexcellent elect rorheological activity has been found when the nano particles are dispersed into the silicone oil. Underan elect ric field of 5 kV/ mm , the shear st ress will reach 90 kPa , when the mass f ractions of acrylamide and SDBS are1. 875 % and 0. 750 % , respectively. The ERF also shows very good dispersion stability.
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