Coaxial electrohydrodynamic direct writing of nano-suspensions

摘要

Two monodisperse nano-suspensions, which contain 20-nm and 120-nm silica particles (30 wt.%), were electrohydrodynamically jetted simultaneously in coaxial needles. Irrespective of which suspension was in the inner or outer needle, the cone-jet mode was obtained and the droplets resulting from jet break-up were used to direct write ～80 μm lines. Turbulent flow in the cones ensured that the suspensions were subjected to intense mixing and therefore the microstructure contains a random mixture of the two types of nanoparticles of unchanged morphology.