Scaling Relation between Current through Suspensions of Carbon-doped Nanoporous TiO_2 Submicron Particles in Silicone Oil and Reciprocal of Shear Rate under Combined Electric and Shear Fields

摘要

We experimentally demonstrate that there is a simple scaling relation between DC current through a suspension of carbon-doped nanoporous TiO_2 submicron particles in silicone oil and reciprocal of shear rate under combined DC electric and shear fields in a rotating coaxial stainless steel cylinder rheometer. Carbon-doped TiO_2 powder is synthesized by hydrolysis of Ti(Obu)4 in alcoholic solution and dodecylamine (DDA) acts as a template. Synthesized carbon-doped TiO_2 powder is carbonized at 673°K under protection of flowing N_2 gas. Carbon-doped nanoporous TiO_2 submicron particles are quantitatively characterized by TEM, XRD, XPS and other analysis tools. The particle size distribution is 100 to 200nm. There are 4～6nm pores on the particle surface layer. The carbon is distributed in a thin 6nm thin surface layer of the particle. An application of the particles is suggested.