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International Journal of Bioprinting Optimizing inkjet bioprinting

Figure 4. Droplet impact regimes on dry solid surfaces. (a) In the deposition regime, the droplet deforms and remains on the surface. This is the desirable
regime for bioprinting applications. (b) The prompt splash regime is characterized by formation of small droplets at the contact line as the droplet spreads.
(c) The corona splash regime is characterized by formation of a bowl-shaped thin liquid film, later forming a corona with small droplets detaching from
its rim. Similar morphology is observed for impacts on liquid films. (d) In the receding breakup regime, droplets break up and are left behind the receding
lamella during the retraction phase of the droplet impact. (e) In the partial rebound regime, part of the droplet remains on the surface. (f) In complete
rebound regime, the entire droplet rebounds during the retraction phase of the droplet impact with the entire droplet leaving the substrate. Adapted with
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for droplet impact onto solid surfaces. This flared film appearance of a crown. This large increase in surface-
contains primarily the liquid from the impacting drop to-volume ratio (relative to the original drop) promotes
as well as some of the target liquid. A capillary wave rapid evaporation. Meanwhile, a cavity begins to develop
train often propagates through the film and is always below the original free liquid surface. The cavity enlarges
perpendicular to the target surface. The top of the film until it quickly takes the shape of a hemisphere, and
also breaks up into jets and small droplets, forming an the crown wall simultaneously begins to subside and

Volume 10 Issue 2 (2024) 190 doi: 10.36922/ijb.2135