CAJ | 학술논문

采用硫酸溶液浸渍TiO_2干凝胶的方法制备了硫酸改性的TiO_2粒子, 并组成了具有显著电流变性能的电流变材料. 用FT-IR、XRD、比表面积分析仪等表征了样品结构, 并测试了其电流变性能. 结果表明:由于硫酸根对晶粒生长的阻碍作用, 与纯TiO_2粒子相比, 硫酸改性的TiO_2粒子的晶粒尺寸降低, 比表面积提高, 并含有大量的强极性键S=O. 当电场强度为3kV/mm时, 纯TiO_2粒子电流变液的场致剪切应力与零场剪切应力之比(τ_E/τ_0)仅为80, 而硫酸改性TiO_2电流变液的τ_E/τ_0高达500. 产生这些现象可归因于硫酸改性TiO_2粒子带来的结构改变赋予其明显的界面极化能力.
채용류산용액침지TiO_2간응효적방법제비료류산개성적TiO_2입자, 병조성료구유현저전류변성능적전류변재료. 용FT-IR、XRD、비표면적분석의등표정료양품결구, 병측시료기전류변성능. 결과표명:유우류산근대정립생장적조애작용, 여순TiO_2입자상비, 류산개성적TiO_2입자적정립척촌강저, 비표면적제고, 병함유대량적강겁성건S=O. 당전장강도위3kV/mm시, 순TiO_2입자전류변액적장치전절응력여령장전절응력지비(τ_E/τ_0)부위80, 이류산개성TiO_2전류변액적τ_E/τ_0고체500. 산생저사현상가귀인우류산개성TiO_2입자대래적결구개변부여기명현적계면겁화능력.
H2SO4-modified TiO_2 particles were prepared using a sol-gel method followed by impregnating the dry gels with sulphuric acid and were used to fabricate an electrorheological (ER) fluid with high ER activity. The as-synthesized H_2SO_4-modified TiO_2 particles were characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), BET N_2 adsorption-desorption isotherm analysis, and the ER effect and dielectric spectra of the ER fluids were measured. The results show that H_2SO_4-modified TiO_2 particles have smaller size of crystal grains and higher specific surface area due to the restraint of SO_4~(2-) from the grain growth. Under the same measured condition and electric field strength of 3kV/mm, the ratio of field-induced shear stress to zero field shear stress (τ_E/τ_0) of TiO_2 particles is 80, while that of H_2SO_4-modified TiO_2 particles is more than 500. The observed ER performances are reasonably explained by the stronger interfacial polarization, which is brought by the specific structures of the H_2SO_4-modified TiO_2 particles.