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

Abstract

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.

Authors:
 [1];  [2];  [1];  [2];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1214464
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Advanced Materials Interfaces
Additional Journal Information:
Journal Volume: 1; Journal Issue: 9; Journal ID: ISSN 2196-7350
Publisher:
Wiley-VCH
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; droplet Ratchet; asymmetric contact angle hysteresis; tilted pillar array; superhydrophobic; ionic liquid

Citation Formats

Agapov, Rebecca L., Boreyko, Jonathan B., Briggs, Dayrl P., Srijanto, Bernadeta R., Retterer, Scott T., Collier, C. Patrick, and Lavrik, Nickolay V. Length scale selects directionality of droplets on vibrating pillar ratchet. United States: N. p., 2014. Web. doi:10.1002/admi.201400337.
Agapov, Rebecca L., Boreyko, Jonathan B., Briggs, Dayrl P., Srijanto, Bernadeta R., Retterer, Scott T., Collier, C. Patrick, & Lavrik, Nickolay V. Length scale selects directionality of droplets on vibrating pillar ratchet. United States. doi:10.1002/admi.201400337.
Agapov, Rebecca L., Boreyko, Jonathan B., Briggs, Dayrl P., Srijanto, Bernadeta R., Retterer, Scott T., Collier, C. Patrick, and Lavrik, Nickolay V. Mon . "Length scale selects directionality of droplets on vibrating pillar ratchet". United States. doi:10.1002/admi.201400337. https://www.osti.gov/servlets/purl/1214464.
@article{osti_1214464,
title = {Length scale selects directionality of droplets on vibrating pillar ratchet},
author = {Agapov, Rebecca L. and Boreyko, Jonathan B. and Briggs, Dayrl P. and Srijanto, Bernadeta R. and Retterer, Scott T. and Collier, C. Patrick and Lavrik, Nickolay V.},
abstractNote = {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.},
doi = {10.1002/admi.201400337},
journal = {Advanced Materials Interfaces},
issn = {2196-7350},
number = 9,
volume = 1,
place = {United States},
year = {2014},
month = {9}
}

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