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Title: Accelerated Chemical Reactions and Organic Synthesis in Leidenfrost Droplets

Authors:
 [1];  [1];  [2];  [1]
  1. Department of Chemistry, Purdue University, 560 Oval Drive West Lafayette IN USA
  2. Department of Chemistry, Purdue University, 560 Oval Drive West Lafayette IN USA, Laboratory of Neuroscience, University of Lille 1, France
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1401698
Grant/Contract Number:
FG02-06ER15807
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 55; Journal Issue: 35; Related Information: CHORUS Timestamp: 2017-10-20 17:34:02; Journal ID: ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Bain, Ryan M., Pulliam, Christopher J., Thery, Fabien, and Cooks, R. Graham. Accelerated Chemical Reactions and Organic Synthesis in Leidenfrost Droplets. Germany: N. p., 2016. Web. doi:10.1002/anie.201605899.
Bain, Ryan M., Pulliam, Christopher J., Thery, Fabien, & Cooks, R. Graham. Accelerated Chemical Reactions and Organic Synthesis in Leidenfrost Droplets. Germany. doi:10.1002/anie.201605899.
Bain, Ryan M., Pulliam, Christopher J., Thery, Fabien, and Cooks, R. Graham. 2016. "Accelerated Chemical Reactions and Organic Synthesis in Leidenfrost Droplets". Germany. doi:10.1002/anie.201605899.
@article{osti_1401698,
title = {Accelerated Chemical Reactions and Organic Synthesis in Leidenfrost Droplets},
author = {Bain, Ryan M. and Pulliam, Christopher J. and Thery, Fabien and Cooks, R. Graham},
abstractNote = {},
doi = {10.1002/anie.201605899},
journal = {Angewandte Chemie (International Edition)},
number = 35,
volume = 55,
place = {Germany},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/anie.201605899

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • In this paper a theoretical investigation is reported on the effect of surface roughness on the phenomenon of Leidenfrost-levitation of droplets above a hot surface. The problem is solved first approximately using a macroscopic approach in which the roughness is replaced by a semi-empirical slip conditions of the Beavers-Joseph type. Next, a microscopic model which determines the vapor flow in the close vicinity of the rough surface is solved numerically. Three basic periodic roughnesses are examined: triangular, rectangular, and semi-cylindrical. The effect of the relative size of the droplet and the roughness elements on the vapor flow is investigated inmore » the course of the study.« less
  • Leidenfrost phenomena on nano- and microstructured surfaces are of great importance for increasing control over heat transfer in high power density systems utilizing boiling phenomena. They also provide an elegant means to direct droplet motion in a variety of recently emerging fluidic systems. Here, we report the fabrication and characterization of tilted nanopillar arrays (TNPAs) that exhibit directional Leidenfrost water droplets under dynamic conditions, namely on impact with Weber numbers 40 at T 325 C. The batch fabrication of the TNPAs was achieved by glancing-angle anisotropic reactive ion etching of a thermally dewet platinum mask, with mean pillar diameters ofmore » 100 nm and heights of 200-500 nm. In contrast to previously implemented macro- and microscopic Leidenfrost ratchets, our TNPAs induce no preferential directional movement of Leidenfrost droplets under conditions approaching steady-state film boiling, suggesting that the observed droplet directionality is not a result of asymmetric vapor flow. Using high-speed imaging, phase diagrams were constructed for the boiling behavior upon impact for droplets falling onto TNPAs, straight nanopillar arrays, and smooth silicon surfaces. The asymmetric impact and directional trajectory of droplets was exclusive to the TNPAs for impacts corresponding to the transition boiling regime, revealing that asymmetric wettability upon impact is the mechanism for the droplet directionality.« less
  • Here in this paper, the self-propelled motion of Leidenfrost droplets on ratchet surfaces is numerically investigated with a thermal multiphase lattice Boltzmann model with liquid-vapor phase change. The capability of the model for simulating evaporation is validated via the D 2 law. Using the model, we first study the performances of Leidenfrost droplets on horizontal ratchet surfaces. It is numerically shown that the motion of self-propelled Leidenfrost droplets on ratchet surfaces is owing to the asymmetry of the ratchets and the vapor flows beneath the droplets. It is found that the Leidenfrost droplets move in the direction toward the slowlymore » inclined side from the ratchet peaks, which agrees with the direction of droplet motion in experiments [Linke et al., Phys. Rev. Lett., 2006, 96, 154502]. Moreover, the influences of the ratchet aspect ratio are investigated. For the considered ratchet surfaces, a critical value of the ratchet aspect ratio is approximately found, which corresponds to the maximum droplet moving velocity. Furthermore, the processes that the Leidenfrost droplets climb uphill on inclined ratchet surfaces are also studied. Lastly, numerical results show that the maximum inclination angle at which a Leidenfrost droplet can still climb uphill successfully is affected by the initial radius of the droplet.« less
  • This paper describes stepwise, on-demand generation and fusion of femtoliter aqueous droplets based on interfacial tension. Sub-millisecond mixing times from droplet fusion were demonstrated, as well as a reversible chemical toggle switch based on alternating fusion of droplets containing acidic or basic solution, monitored with the pH-dependent emission of fluorescein.