2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Guided Selfassembly of Titanium Oxide Nanowires and Nanorods

B. Wang, M. Zhou, Z. Rozynek, J.O. Fossum
Norwegian University of Science and Technology (NTNU), NO

nanowires, nanorods, assembly, electrorheological effect, SAXS

Titanium oxide nanowires and nanorods are synthesized by a simple wet chemical method and characterized by SAXS/WAXS, AFM, and thermal analysis. Firstly, the precursor Tetrabutyl titanate (TBT) was added to ethylene glycol (EG) and heated to form TiOx nanowires.6 Subsequently, TiOx nanorods with high rough surface was obtained by hydrolysis of TBT with the help of Cethyl-Trimethyl-Ammonium Bromide (CTAB) as surfactant in the EG solution. AFM images show that the nanowires are aggregating to form bundles and that TiOx nanorods with rough surfaces are formed from self-assembly of TiOx nanospheres. The electrorheological (ER) effect has been investigated with suspensions of titanium oxide nanowires or nanorods dispersed in silicone oil. Suspensions of titanium oxide nanowires or nanorods exhibit a dramatic assembly when submitted to a strong DC electric field and aggregate to forms chains like structures along the direction of applied electric field. We have used small angle X-ray scattering (SAXS) to get insight into the structure of the titanium oxide nanowires and nanorods in the chains. The two-dimensional SAXS images from chains of anisotropic shape particles exhibit a marked anisotropy SAXS patterns, reflecting the preferential guided selfassembly of the particles in the electric field.

Nanotech 2008 Conference Program Abstract