Tuesday, November 6, 2007
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Self-Assembly And Flow Alignment Of Inorganic Nanorods

Shanthi Murali, Bennett D. Marshall, Dhriti Nepal, and Virginia A. Davis. Chemical Engineering, Auburn University, 212,Ross Hall, Auburn, AL 36849

Developing applications for nanorods requires the ability to manipulate and organize them. The combination of self-assembly into liquid crystalline phases with flow alignment is a promising route for the production of highly aligned macroscopic arrays of the nanorods. Here we report the alignment of silver and other nanorods in aqueous and organic solvents. Our focus is on establishing the relationships between liquid crystalline dispersion morphology, applied shear and the morphology of dried nanorod arrays. The dispersions and resulting dried assemblies were characterized using a combination of optical microscopy, scanning electron microscopy, atomic force microscopy, Raman spectroscopy, UV-vis absorption spectroscopy. The effects of nanorod concentration, aspect ratio, solvent and substrate on the alignment are described.