Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation

Mulroe, Megan D.; Srijanto, Bernadeta R.; Ahmadi, S. Farzad; Collier, C. Patrick; Boreyko, Jonathan B.

doi:10.1021/acsnano.7b04481

Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation

Journal Article · Tue Jul 18 00:00:00 EDT 2017 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.7b04481· OSTI ID:1394224

Mulroe, Megan D. ^[1]; ^[2]; Ahmadi, S. Farzad ^[1]; ^[2]; ^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Biomedical Engineering and Mechanics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Cener for Nanophase Materials Science

It was recently discovered that condensation growing on a nanostructured superhydrophobic surface can spontaneously jump off the surface, triggered by naturally occurring coalescence events. Many reports have observed that droplets must grow to a size of order 10 μm before jumping is enabled upon coalescence; however, it remains unknown how the critical jumping size relates to the topography of the underlying nanostructure. Here, we characterize the dynamic behavior of condensation growing on six different superhydrophobic nanostructures, where the topography of the nanopillars was systematically varied. The critical jumping diameter was observed to be highly dependent upon the height, diameter, and pitch of the nanopillars: tall and slender nanopillars promoted 2 μm jumping droplets while short and stout nanopillars increased the critical size to over 20 μm. The topology of each surface is successfully correlated to the critical jumping diameter by constructing an energetic model that predicts how large a nucleating embryo needs to grow before it can inflate into the air with an apparent contact angle large enough for jumping. Furthermore, by extending our model to consider any possible surface, it is revealed that properly designed nanostructures should enable nanometric jumping droplets, which would further enhance jumping droplet condensers for heat transfer, anti-fogging, and anti-frosting applications.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1394224

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 8 Vol. 11; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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