稀土掺杂纳米二氧化钛接枝聚硅氧烷电流变液的制备与性能研究

Preparation of Rare Earth Doped TiO_2 Grafting Poly-Silicone Electrorheological Fluid and Its Electrorheological Response

采用水热合成法制备稀土掺杂金红石型纳米二氧化钛,并通过XRD,TEM等对其进行了表征。结果表明,稀土离子的掺杂使得二氧化钛(110)晶面衍射峰位置发生了漂移,并且出现了不同程度的宽化,但并没有改变纳米TiO2的晶型,也没有出现稀土氧化物的特征衍射峰。稀土掺杂后的二氧化钛形貌为棒状,长径比约为110 nm∶20 nm。利用硅烷偶联剂KH-570对稀土掺杂纳米TiO2表面修饰,与乙烯硅油发生接枝反应制备新型电流变液,并通过旋转流变仪测试了该电流变液的稳态电流变性能。通过红外吸收光谱发现,乙烯基硅油与KH-570-TiO2发生了一定程度的接枝共聚反应。由于无机纳米粒子与聚硅氧烷连续相形成化学键体系,电流变液的抗沉降稳定性得到了很大的提高;稀土离子的掺杂增大了体系的极性,随着电场强度的增大,电流变液的线性平台区也随之变长,表现出典型的类固态响应行为,其中以Sm3+的掺杂效果最为显著。

Rare earth doped rutile titanium dioxide nanoparticles were prepared by hydrothermal synthesis method. And the RE-TiO2 particles were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM） . The results showed that the incorporation of RE3 ＋ did preserve the rutile crystal form of TiO2, and there was no other crystal type. But titanium dioxide crystal diffraction peak locations （110） drifted, and appeared different degrees of the wide. The feature of the RE-TiOz nanoparticles was clubbed and the size was about 110 nm： 20 nm. KH-570 silane coupling agent was used for modifying rare earth doped nanometer TiO2 and reacted with vinyl silicone oil to prepare new electrorheological fluid. And the steady electrorheologieal fluid performance was tested by rotary rheometer. Through the infrared absorption spectrum, it was found that vinyl silicone oil was reacted with KH-570-TiO2. Because the inorganic nanometer particles and continuous phase of polyorganosiloxane formed chemical bonds system, the ERF had excellent anti-sedimentation stability. Rare earth ions doping in the nanometer particles increased the polarity of the system, and the linear viscoelastic zone was longer with the increase of electric field strength showing the typical kind of solid response behavior. With doping Sm^3＋ , the ERF showed good performance of the electrorheological responses.