Drop impact printing

Modak, CD and Kumar, A and Tripathy, A and Sen, P (2020) Drop impact printing. In: Nature Communications, 11 (1).

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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 μm diameter are dispensed in droplets of ~80 μm 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.

Item Type:	Journal Article
Publication:	Nature Communications
Publisher:	Nature Research
Additional Information:	The copyright of this article belongs to Nature Research
Keywords:	nanomaterial; nanoparticle, droplet; hydrophobicity; nanoparticle; particle size; satellite data; surface tension; viscosity, Article; cell suspension; drop on demand printing technique; gene expression; hydrophobicity; microarray analysis; nanofabrication; particle size; printing; scanning electron microscopy; surface tension
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	22 Sep 2020 09:34
Last Modified:	22 Sep 2020 09:34
URI:	http://eprints.iisc.ac.in/id/eprint/66516

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