Uniform Nanoliter-Sized Droplet Deposition using Fluid Motion in Ratcheted Micro-Channels

This paper reports on a new and simple way of uniform nanoliter droplet deposition by moving a microliter droplet through a vibrating ratcheted channel. Nanoliter droplets were deposited on Si and SU8 substrates/channels. A uniform array of 514 plusmn 62pL droplets was deposited on a SU8 channel by vibrating the substrate at a frequency and amplitude of 50 Hz and 3.5 mm (droplet speed ~ 60mm/s).