Length scale selects directionality of droplets on vibrating pillar ratchet

Agapov, Rebecca L.; Boreyko, Jonathan B.; Briggs, Dayrl P.; Srijanto, Bernadeta R.; Retterer, Scott T.; Collier, C. Patrick; Lavrik, Nickolay V.

doi:10.1002/admi.201400337

Title: Length scale selects directionality of droplets on vibrating pillar ratchet

Journal Article · Mon Sep 22 00:00:00 EDT 2014 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.201400337· OSTI ID:1214464

Agapov, Rebecca L. ^[1]; Boreyko, Jonathan B. ^[2]; Briggs, Dayrl P. ^[1]; Srijanto, Bernadeta R. ^[2]; Retterer, Scott T. ^[1]; Collier, C. Patrick ^[1]; Lavrik, Nickolay V. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Directional control of droplet motion at room temperature is of interest for applications such as microfluidic devices, self-cleaning coatings, and directional adhesives. Here, arrays of tilted pillars ranging in height from the nanoscale to the microscale are used as structural ratchets to directionally transport water at room temperature. Water droplets deposited on vibrating chips with a nanostructured ratchet move preferentially in the direction of the feature tilt while the opposite directionality is observed in the case of microstructured ratchets. This remarkable switch in directionality is consistent with changes in the contact angle hysteresis. To glean further insights into the length scale dependent asymmetric contact angle hysteresis, the contact lines formed by a nonvolatile room temperature ionic liquid placed onto the tilted pillar arrays were visualized and analyzed in situ in a scanning electron microscope. As a result, the ability to tune droplet directionality by merely changing the length scale of surface features all etched at the same tilt angle would be a versatile tool for manipulating multiphase flows and for selecting droplet directionality in other lap-on-chip applications.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1214464

Journal Information:: Advanced Materials Interfaces, Vol. 1, Issue 9; ISSN 2196-7350

Publisher:: Wiley-VCH

Country of Publication:: United States

Language:: English

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droplet Ratchet
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