Figure 1

Coaxial microfluidic device fabricated with glass capillaries. (a) A microfluidic platform under operation; (b) A microfluidic chip constructed of glass capillaries and NanoPort assemblies (Upchurch Scientific); (c) The device under optical microscope; (d) The nozzle of the inside round capillary under optical microscope. The nanoparticles are formed away from the nozzle in the large capillary tube.