2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Scaling Relation between Current through Suspensions of Carbon-doped TiO2 Nanoparticles in Silicone Oil and Reciprocal of Shear Rate under Combined Electric and Shear Fields

Z.Y. Qiu, Y. Shen, L.W. Zhou and Y.H. Zhu
City College of New York, US

TiO2 nanoparticle synthesis, quantitative characterization, current scaling relation

We synthesize carbon-doped TiO2 nanoparticles by hydrolysis of Tetra-n-butyl titanate Ti(OBu)4 in alcoholic solution. Ddodecylamine (DDA) works as template during synthesis. We accurately control carbon contents in nanoparticles by DDA content and carbonization temperature to meet our designed requirements. Nanoparticles are quantitatively characterized with TEM and other analyzers. The particle sizes range from 80 to 130nm and their average size is 102nm. These nanoparticles are almost spherical. 4 to 6nm pores on disorder structures are clearly visible. The surface area is 15.00m2/g and pore size is 6.0nm. We measure the DC current through the suspensions of carbon-doped TiO2 nanoparticles in silicone oil when the suspension is sheared by a rotating rheometer. We find that there is a scaling relation between the DC current density and the reciprocal of shear rate. It remains to be answered where the stochastic sources come which cause the current scaling relation. We are developing a hybrid model of molecular dynamics (MD) and continuous model so as to solve the puzzle. The TiO2 nanoparticles are good solid phase of electrorheological fluids and also act as a component of proposed sensing materials. Moreover, we are trying to use the TiO2 nanoparticles for separation of biological samples.

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