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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。
The rare earth doped rutile nano-TiO2 was prepared by hydrothermal method and characterized by XRD, TEM and so on. The results show that the doping of rare earth ions causes the diffraction peaks of the (110) crystal surface of TiO2 to drift and widen to varying degrees without changing the crystalline form of TiO2 and the characteristic diffraction of rare earth oxides peak. The morphology of titania doped with rare earth is rod-like, the aspect ratio is about 110 nm: 20 nm. A novel electrorheological fluid was prepared by surface modification of rare earth doped nano-TiO2 and grafting with vinyl silicone oil using a silane coupling agent KH-570. The steady-state electrorheological property of the electrorheological fluid was tested by rotary rheometer. It was found by infrared absorption spectroscopy that a certain degree of graft copolymerization of vinyl silicone oil with KH-570-TiO2 occurred. Due to the formation of the chemical bond system between the inorganic nanoparticles and the continuous phase of the polysiloxane, the anti-settling stability of the electrorheological fluid has been greatly improved. The doping of rare earth ions increases the polarity of the system. With the increase of the electric field strength, , The linear plateau region of electrorheological fluid also becomes longer, showing a typical solid-like response behavior, in which the doping effect of Sm3 + is the most significant.