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| Titel |
Investigation of Volume-Dependent Homogeneous Ice Nucleation of Water Droplets Using a Microfluidic Device |
| VerfasserIn |
B. Riechers, F. Wittbracht, A. Hütten, T. Koop |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066165
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| Zusammenfassung |
| Investigations of the kinetics of phase transitions are of fundamental importance for the
understanding of many atmospheric processes occurring in aerosols and clouds. However,
existing measurements often show a wide range of reported nucleation rates, in particular for
ice nucleation processes.
Here, we focus on studying volume-dependent homogeneous ice nucleation in water
droplets. As homogeneous nucleation is a stochastic process, studying many droplets of the
same size is a prerequisite for deducing meaningful nucleation rates. We have prepared
monodisperse water droplets with mean diameters between 50 μm and 100 μm and small
standard deviations by employing microfluidic channels on a lab-on-a-chip device. Rather
than studying the produced droplets on-chip in a very complicated and delicate device, we
collected the droplets for off-chip ice nucleation analysis with a standard differential scanning
calorimeter. The obtained freezing signals were analysed to obtain volume-dependent
homogeneous ice nucleation rates, which are then compared to previously reported values. |
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