Transport of a soft cargo on a nanoscale ratchet

Koray Sekeroglu, Umut A. Gurkan, Utkan Demirci, Melik C. Demirel

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Surface ratchets can guide droplet transport for microfluidic systems. Here, we demonstrated the actuation of microgels encapsulated in droplets using a unidirectional nanotextured surface, which moves droplets with low vibration amplitudes by a ratcheting mechanism. The nanofilm carries droplets along the ratchets with minimal drop shape deformation to move the encapsulated soft cargo, i.e., microscale hydrogels. The tilted nanorods of the nanofilm produce unidirectional wetting, thereby enabling droplet motion in a single direction. Maximum droplet translation speed on the nanofilm was determined to be 3.5 mm/s, which offers a pathway towards high throughput microgel assembly applications to build complex constructs.

Original languageEnglish (US)
Article number063703
JournalApplied Physics Letters
Issue number6
StatePublished - Aug 8 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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