Nanowires are potentially important constituents for nanoscale devices. Manipulation of nanowires
in suspension in order to assemble them for device applications has been a formidable problem.
Previously most methods have involved the use of external magnetic fields acting on magnetic
nanowires. Using ac electric fields applied to strategically designed microelectrodes, we show how
nanowires, both magnetic and nonmagnetic, in suspension can be driven to align, to chain, to
accelerate in directions parallel and perpendicular to its orientation, to concentrate onto designated
places, and to disperse in a controlled manner with high efficiency despite an extremely low
Reynolds number (of the order of 10<sup>-5</sup>). This method of manipulating nanowires can also be applied
to other small elongated entities such as carbon nanotubes.