Issue 44, 2011
From the journal:

Physical Chemistry Chemical Physics

Single freezing and triple melting of micrometre-scaled (NH4)2SO4/H2O droplets

Anatoli Bogdan,*abc   Mario J. Molina,d   Heikki Tenhub  and  Thomas Loertinga  

* Corresponding authors

a Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, Innsbruck, Austria
E-mail: anatoli.bogdan@uibk.ac.at
Fax: +43 5125072925
Tel: +43 5125075072

b Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, Finland

c Department of Physics, University of Helsinki, P.O. Box 48, Finland

d Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, USA

Abstract

Atmospheric aerosol droplets containing NH4+ and SO42− ions are precursors of cirrus ice clouds. However, the low-temperature phase transformation of such droplets is not understood yet. Here we show for the first time that micrometre-scaled (NH4)2SO4/H2O droplets produce one freezing event but three melting events which are the melting of (i) pure ice, (ii) eutectic ice/(NH4)2SO4, and (iii) eutectic ice/(NH4)3H(SO4)2. We also find that the melting of ice/(NH4)3H(SO4)2 consists of two eutectic melting events, presumably ice/letovicite-II and ice/letovicite-III.

Graphical abstract: Single freezing and triple melting of micrometre-scaled (NH4)2SO4/H2O droplets

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Article information

DOI
https://doi.org/10.1039/C1CP21770D
Article type
Communication
Submitted
01 Jun 2011
Accepted
25 Jul 2011
First published
12 Aug 2011

Phys. Chem. Chem. Phys., 2011,13, 19704-19706

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Single freezing and triple melting of micrometre-scaled (NH4)2SO4/H2O droplets

A. Bogdan, M. J. Molina, H. Tenhu and T. Loerting, Phys. Chem. Chem. Phys., 2011, 13, 19704 DOI: 10.1039/C1CP21770D

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