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Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling

Goy, Claudia and Potenza, Marco A. C. and Dedera, Sebastian and Tomut, Marilena and Guillerm, Emmanuel and Kalinin, Anton and Voss, Kay-Obbe and Schottelius, Alexander and Petridis, Nikolaos and Prosvetov, Alexey and Tejeda, Guzmán and Fernández, José M. and Trautmann, Christina and Caupin, Frédéric and Glasmacher, Ulrich and Grisenti, Robert E. (2018):
Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling.
In: Physical Review Letters, American Physical Society, pp. 015501, 120, (1), ISSN 0031-9007, DOI: 10.1103/PhysRevLett.120.015501, [Online-Edition: https://doi.org/10.1103/PhysRevLett.120.015501],
[Article]

Abstract

The fast evaporative cooling of micrometer-sized water droplets in a vacuum offers the appealing possibility to investigate supercooled water—below the melting point but still a liquid—at temperatures far beyond the state of the art. However, it is challenging to obtain a reliable value of the droplet temperature under such extreme experimental conditions. Here, the observation of morphology-dependent resonances in the Raman scattering from a train of perfectly uniform water droplets allows us to measure the variation in droplet size resulting from evaporative mass losses with an absolute precision of better than 0.2%. This finding proves crucial to an unambiguous determination of the droplet temperature. In particular, we find that a fraction of water droplets with an initial diameter of 6379±12  nm remain liquid down to 230.6±0.6  K. Our results question temperature estimates reported recently for larger supercooled water droplets and provide valuable information on the hydrogen-bond network in liquid water in the hard-to-access deeply supercooled regime.

Item Type: Article
Erschienen: 2018
Creators: Goy, Claudia and Potenza, Marco A. C. and Dedera, Sebastian and Tomut, Marilena and Guillerm, Emmanuel and Kalinin, Anton and Voss, Kay-Obbe and Schottelius, Alexander and Petridis, Nikolaos and Prosvetov, Alexey and Tejeda, Guzmán and Fernández, José M. and Trautmann, Christina and Caupin, Frédéric and Glasmacher, Ulrich and Grisenti, Robert E.
Title: Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling
Language: English
Abstract:

The fast evaporative cooling of micrometer-sized water droplets in a vacuum offers the appealing possibility to investigate supercooled water—below the melting point but still a liquid—at temperatures far beyond the state of the art. However, it is challenging to obtain a reliable value of the droplet temperature under such extreme experimental conditions. Here, the observation of morphology-dependent resonances in the Raman scattering from a train of perfectly uniform water droplets allows us to measure the variation in droplet size resulting from evaporative mass losses with an absolute precision of better than 0.2%. This finding proves crucial to an unambiguous determination of the droplet temperature. In particular, we find that a fraction of water droplets with an initial diameter of 6379±12  nm remain liquid down to 230.6±0.6  K. Our results question temperature estimates reported recently for larger supercooled water droplets and provide valuable information on the hydrogen-bond network in liquid water in the hard-to-access deeply supercooled regime.

Journal or Publication Title: Physical Review Letters
Volume: 120
Number: 1
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
Date Deposited: 10 Dec 2018 11:06
DOI: 10.1103/PhysRevLett.120.015501
Official URL: https://doi.org/10.1103/PhysRevLett.120.015501
Funders: This work was partially supported by the Bundesministerium für Bildung und Forschung through Grant No. 05K13RF5 and by the Spanish Ministerio de Economía y Competitividad (MINECO) through Grant No. FIS2013-48275-C2.
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