I prepared Cu Au core shell nanowires. After fabrication, they aggregated. Vortex has no effect while sonication causes them to break into short wires and rods.
How can I redisperse them in IPA or any other solvent?
Once you make nanowires, you should keep in a solvent, never leave the solid state. It is impossible to redisperse the solid aggregated nanowires as your original nanowires formed.