Drop impact printing.

ABSTRACT: 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 have been observed and explained. The volume of the generated droplet scales with the pore size. Based on this phenomenon, we propose a 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??m diameter are dispensed in droplets of ~80??m diameter. Printing is performed for surface tension as low as 32?mNm^-1 and viscosity as high as 33?mPa?s. In comparison to existing techniques, this way of printing is widely accessible as it is significantly simple and economical.

SUBMITTER: Modak CD 

PROVIDER: S-EPMC7455714 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature