采用醇盐水解法, 合成了铬离子改性氧化钛/丙烯酰胺纳米颗粒. XRD、TEM、粒度分析显示颗粒为无定型态, 平均粒径为140nm, Cr离子与十二烷基苯磺酸钠的同时加入对粒径的减小有协同作用. 粒径减小可引起颗粒浸润性的改善. 当Cr/Ti摩尔比为10%时, 所得颗粒配制的电流变液显示出极好的电流变效应: 在4kV/mm直流电场下, 该电流变液的静态剪切应力高达152kPa. 离子掺杂与浸润性的改善是电流变液力学性能提高的原因.
The modified hydrolysis method was employed to prepare modified TiOx/acrylamide particles doped with chromium ions. XRD, TEM and particle size characterization results indicate that the particles are amorphous, and the average particle size is 140nm. The ERF possesses an optimum property when the Cr/Ti molar rate is 10%, under 4kV/mm DC electric field, the static shear stress can reach 152kPa. The mechanic property of ERF is enhanced remarkably due to the good wettability between particle and silicon oil, which results from the decrease of particle size caused by the synergetic effect of employment of Cr ions and SDBS synchronously. The ERF also shows a very good dispersion stability.
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