花状微米颗粒的制备及其电流变性能研究

Preparation and electrorheological behavior of flower-like microparticles

采用溶剂热法制备出花状微米颗粒。采用SEM,TEM,XRD,FT-IR 等方法分析颗粒形貌及成分。结果表明,花状颗粒为丙三醇基化合物,其表观直径在2～3μm 之间,表面由次级的刺状结构组成。分别以花状微米颗粒和光滑球状 TiO 2颗粒为分散相制备电流变液,并测试其电流变性能和沉降稳定性。实验结果表明,在相同电场强度下,花状颗粒电流变液的剪切屈服强度明显高于光滑球状颗粒电流变液,但漏电流密度远小于光滑球状颗粒电流变液；静置12d,花状颗粒电流变液的抗沉降率较之光滑球状颗粒电流变液有显著提高。花状颗粒特有的形貌是其具有优异电流变性能和沉降稳定性的主要原因。

Flower-like microparticles were synthesized by a simple solvothermal method.The morphology and structure of the particles were characterized by scanning electron microscopy（SEM）,transmission electron mi-croscopy（TEM）,X-ray diffraction（XRD）and infrared spectroscopy（FT-IR）.The results showed that the flow-er-like particles are titanium glycerolate phase,and present secondary thorn structure on their surface.The di-ameter of flower-like particles ranges from 2μm to 3μm.Two electrorheological（ER）fluids were fabricated by dispersing the flower-like particles and smooth spherical particles,the composition of which was TiO 2 ,in sili-cone oil.The electrorheological behavior and sedimentation stability was tested.The results indicated that at the same electric field levels,the flower-like particles-based ER fluid presents higher yield stress and lower current density than the smooth spherical particles-based one.Furthermore,after 12 days’setting without disturb,the sedimentation stability of the flower-like particles-based ER fluid was much better than that of the smooth spherical particles-based material.The specific morphology of the flower-like particles may be the main reason for the significant ER effect and good sedimentation stability.