  Hydrodynamic collapse of a central air-cavity during the recoil phase of
droplet impact on a superhydrophobic sieve leads to satellite-free generation
of a single droplet through the sieve. Two modes of cavity formation and
droplet ejection was observed and explained. The volume of the generated
droplet scales with the pore size. Based on this phenomenon, we propose a new
drop-on-demand printing technique. Despite significant advancements in inkjet
technology, enhancement in mass-loading and particle-size have been limited due
to clogging of the printhead nozzle. By replacing the nozzle with a sieve, we
demonstrate printing of nanoparticle suspension with 71% mass-loading.
Comparatively large particles of 20 micrometer diameter were dispensed in
droplets of 80 micrometer diameter. Printing was performed for surface tension
as low as 32 mNm-1 and viscosity as high as 33 mPa-s. In comparison to existing
techniques, this new way of printing is widely accessible as it is
significantly simple and economical.
