(600a) Dispersion, Brownian Motion, And Self-Assembly Of Germanium Nanowires

This research focuses on the dispersion, Brownian motion and self-assembly of high aspect ratio germanium nanowires with lengths ranging from two to ten microns. Many bottoms-up assembly methods rely on the controlled assembly of nanomaterials from liquid dispersions. Understanding the fundamental rheological properties of nanorods and nanowires dispersed in solvents is key to understanding and controlling the assembly process. The extent of germanium nanowire dispersion in various organic solvents was determined; three of the best solvents were selected for further research. The rotational diffusivities of germanium nanowires in organic solvents were measured in confined and unconfined geometries using particle tracking techniques. The resulting rotational diffusivity versus length curve was in good agreement with theoretical models for rigid Brownian rods. Furthermore, the potential for this rigid rod behavior to result in liquid crystalline self-assembly is illustrated.