Urea coated barium titanyl oxalate

Figure 8 Static yield stress of urea coated barium titanyl oxalate /silicone oil suspension is plotted as a function of applied electric field for two solid concentrations. Inset logarithm of the current density J plotted as a function of iE. Reproduced with pennission from W. Wen, X. Huang, S. Yang, K. Lu, and P. Sheng, Nature Materials, 2(2003)727...

Figure 7-3 (author s unpublished experimental data) demoiKtrates the results of the impedance analysis for a medium composed of insulating-base silicon oil with characteristic resistance 10 ohm and capacitance 5 10" F with added 25% urea-coated barium titanyl oxalate conductive particles with characteristic resistance 10 ohm and capacitance 10" F at 25 °C. The pure base oil shows a single relaxation, and particle-containing samples show relaxations at high frequency due to the conductive particles and at low frequency due to the base fluid in the complex modulus plot. 

---