Synthesis and electrorheological properties of oxalate group-modified amorphous titanium oxide nanoparticles
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A kind of titanium oxide nanoparticles modified with varying amounts of oxalate group was prepared using a modified hydrolysis method. The microstructure, dielectric properties, and electrorheological (ER) performance were investigated. The results indicate that the oxalate group can effectively improve the dielectric properties and surface polarizability of the particles, and the ER performance of modified titanium oxide-based ER fluid is much higher than that of pure titanium oxide-based ER fluid. The shear stress of suitable oxalate group-modified amorphous titanium oxide-based ER fluid with a volume fraction of 30% reaches 47.5 kPa at E = 5 kV/mm, and the current density is less than 18 μAcm−2. The yield stress can be up to 114 kPa at E = 5 kV/mm with a volume fraction of 40%.
KeywordsElectrorheological fluid Dielectric property Titanium oxide Oxalate group Shear stress
This research is supported by the National Basic Research Program of China (Grant No. 2009CB930801), the National Natural Science Foundation of China (Grant No. 10904155 and 21003145), the Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KJCX2.YW.M07), the CAS/SAFEA International Partnership Program for Creative Research Teams, and by Zhejiang Provincial Natural Science Foundation of China (Grant No. D4080489 and Y4090044), Ningbo Natural Science Foundation (2009A610031, 2010A610170). We also express our gratitude to the aided program for Science and Technology Innovative Research Team of zhejiang Province and Ningbo Municipality (2009B21005).
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