One-to-one mapping of droplet impact. Top-down view of our impact droplet generator. The actuating pin forms a circular indentation on the microchip made using polydimethylsiloxane (PDMS) on channel closure. Mineral oil is used as a carrier fluid in a flow-focusing geometry. The droplets are of food coloring in deionized water. Capillary pin geometry was implemented on the fluid line carrying the water-based solution, at the point of intersection with the mineral oil lines. With each punched hole, the actuator pin has a net downward force before springing back to its original position. The impact during this process results in the ejection of a fluid stream that forms a droplet and is carried downstream in the oil line. The capture and playback rate for the movie is 50 frames per second.
Korir G, Prakash M
CC BY 4.0
<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4349784/bin/pone.0115993.s010.mp4">S3 Movie</a> from <cite style="font-style:normal">Korir G, Prakash M (2015). "<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4349784">Punch Card Programmable Microfluidics</a>". <i>PLOS ONE</i>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1371/journal.pone.0115993">10.1371/journal.pone.0115993</a>. <a href="https://en.wikipedia.org/wiki/PMID" class="extiw" title="w:PMID">PMID</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pubmed/25738834">25738834</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" class="extiw" title="w:PubMed Central">PMC</a>: <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4349784">4349784</a>.</cite>