Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation
Abstract
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 formore »
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1394224
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 8; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; coalescence; condensation; critical jumping size; jumping droplets; optimizing nanostructure design; superhydrophobic
Citation Formats
Mulroe, Megan D., Srijanto, Bernadeta R., Ahmadi, S. Farzad, Collier, C. Patrick, and Boreyko, Jonathan B. Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation. United States: N. p., 2017.
Web. doi:10.1021/acsnano.7b04481.
Mulroe, Megan D., Srijanto, Bernadeta R., Ahmadi, S. Farzad, Collier, C. Patrick, & Boreyko, Jonathan B. Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation. United States. https://doi.org/10.1021/acsnano.7b04481
Mulroe, Megan D., Srijanto, Bernadeta R., Ahmadi, S. Farzad, Collier, C. Patrick, and Boreyko, Jonathan B. 2017.
"Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation". United States. https://doi.org/10.1021/acsnano.7b04481. https://www.osti.gov/servlets/purl/1394224.
@article{osti_1394224,
title = {Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation},
author = {Mulroe, Megan D. and Srijanto, Bernadeta R. and Ahmadi, S. Farzad and Collier, C. Patrick and Boreyko, Jonathan B.},
abstractNote = {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.},
doi = {10.1021/acsnano.7b04481},
url = {https://www.osti.gov/biblio/1394224},
journal = {ACS Nano},
issn = {1936-0851},
number = 8,
volume = 11,
place = {United States},
year = {Tue Jul 18 00:00:00 EDT 2017},
month = {Tue Jul 18 00:00:00 EDT 2017}
}
Web of Science
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