scholarly journals Comment on evidence for surface-initiated homogeneous nucleation

2003 ◽  
Vol 3 (5) ◽  
pp. 1439-1443 ◽  
Author(s):  
J. E. Kay ◽  
V. Tsemekhman ◽  
B. Larson ◽  
M. Baker ◽  
B. Swanson
Keyword(s):  
Homogeneous Nucleation ◽  
Laboratory Experiments ◽  
Drop Size ◽  
Supercooled Water ◽  
Ice Nucleation ◽  
Surface Nucleation ◽  
Embryo Formation ◽  
Atmospheric Data ◽  
Water Drops

Abstract. We investigate theoretical, laboratory, and atmospheric evidence for a recently proposed hypothesis: homogeneous ice nucleation initiates at the surface, not in the volume, of supercooled water drops. Using existing thermodynamic arguments, laboratory experiments, and atmospheric data, we conclude that ice embryo formation at the surface cannot be confirmed or disregarded. Ice nucleation rates measured as a function of drop size in an air ambient could help distinguish between volume and surface nucleation rates.

scholarly journals Comment on evidence for surface-initiated homogenous nucleation

2003 ◽  
Vol 3 (4) ◽  
pp. 3361-3372 ◽  
Author(s):  
J. E. Kay ◽  
V. Tsemekhman ◽  
B. Larson ◽  
M. Baker ◽  
B. Swanson
Keyword(s):  
Laboratory Experiments ◽  
Drop Size ◽  
Supercooled Water ◽  
Ice Nucleation ◽  
Surface Nucleation ◽  
Embryo Formation ◽  
Homogenous Nucleation ◽  
Atmospheric Data ◽  
Water Drops

Abstract. We investigate theoretical, laboratory, and atmospheric evidence for a recently proposed hypothesis: homogenous ice nucleation occurs at the surface, not in the volume, of supercooled water drops. Using existing thermodynamic arguments, laboratory experiments, and atmospheric data, we conclude that ice embryo formation at the surface cannot be confirmed or disregarded. Ice nucleation rates measured as a function of drop size in an air ambient could help distinguish between volume and surface nucleation rates.

A microfluidic apparatus for the study of ice nucleation in supercooled water drops

Lab on a Chip ◽  
2009 ◽  
Vol 9 (16) ◽  
pp. 2293 ◽  
Author(s):  
Claudiu A. Stan ◽  
Grégory F. Schneider ◽  
Sergey S. Shevkoplyas ◽  
Michinao Hashimoto ◽  
Mihai Ibanescu ◽  
...  
Keyword(s):  
Supercooled Water ◽  
Ice Nucleation ◽  
Water Drops

scholarly journals Modelling the effect of condensed-phase diffusion on the homogeneous nucleation of ice in supercooled water

2019 ◽  
Author(s):  
Kathryn Fowler ◽  
Paul Connolly ◽  
David Topping
Keyword(s):  
Low Temperature ◽  
Aerosol Particle ◽  
Condensed Phase ◽  
Homogeneous Nucleation ◽  
Supercooled Water ◽  
Organic Aerosol ◽  
Ice Nucleation ◽  
Cirrus Clouds ◽  
Climate Modelling ◽  
Phase Diffusion

Abstract. In-situ studies of low temperature cirrus clouds have found unexpectedly low ice crystal numbers and consistently high supersaturations, which suggest that our understanding of the freezing mechanisms under these conditions are incomplete. Computational models typically use homogeneous nucleation to predict the ice nucleated in supercooled water. However, the existence of ultra-viscous organic aerosol in the upper troposphere has offered alternative ice nucleation pathways, which have been observed in laboratory studies. The possible effects of aerosol viscosity on cloud micro-physical properties have traditionally been interpreted from simple model simulations of an individual aerosol particle based on equilibration timescales. In this study, to gain insight into the formation of ice in low temperature cirrus clouds, we have developed the first cloud parcel model with bin micro-physics to simulate condensed phase diffusion through each individual aerosol particle. Our findings demonstrate, for the first time, the complex relationship between the rate of ice formation and the viscosity of secondary organic aerosol, driven by two competing effects – which cannot be explained using existing modelling approaches. The first is inhibition of homogeneous ice nucleation below 200 K, due to restricted particle growth and low water volume. The second occurs at temperatures between 200 K and 220 K, where water molecules are slightly more mobile and a layer of water condenses on the outside of the particle, causing an increase in the number of frozen aerosol particles. Our new model provides a basis to better understand and simulate cirrus cloud formation on a larger scale, addressing a major source of uncertainty in climate modelling through the representation of cloud processes.

scholarly journals Laboratory evidence for volume-dominated nucleation of ice in supercooled water microdroplets

2004 ◽  
Vol 4 (3) ◽  
pp. 3077-3088 ◽  
Author(s):  
D. Duft ◽  
T. Leisner
Keyword(s):  
Supercooled Water ◽  
Ice Nucleation ◽  
Laboratory Evidence ◽  
Surface Nucleation ◽  
Electrodynamic Balance ◽  
Homogeneous Freezing

Abstract. We report on measurements of the rate of homogeneous ice nucleation in supercooled water microdroplets levitated in an electrodynamic balance. By comparison of the freezing probability for droplets of radius 49 µm and 19 µm, we are able to conclude that homogeneous freezing is a volume-proportional process and that surface nucleation might only be important, if at all, for much smaller droplets.

scholarly journals Nonthermal ice nucleation observed at distorted contact lines of supercooled water drops

2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Fan Yang ◽  
Owen Cruikshank ◽  
Weilue He ◽  
Alex Kostinski ◽  
Raymond A. Shaw
Keyword(s):  
Supercooled Water ◽  
Ice Nucleation ◽  
Contact Lines ◽  
Water Drops

scholarly journals Laboratory evidence for volume-dominated nucleation of ice in supercooled water microdroplets

2004 ◽  
Vol 4 (7) ◽  
pp. 1997-2000 ◽  
Author(s):  
D. Duft ◽  
T. Leisner
Keyword(s):  
Supercooled Water ◽  
Ice Nucleation ◽  
Laboratory Evidence ◽  
Surface Nucleation ◽  
Electrodynamic Balance ◽  
Homogeneous Freezing

Abstract. We report on measurements of the rate of homogeneous ice nucleation in supercooled water microdroplets levitated in an electrodynamic balance. By comparison of the freezing probability for droplets of radius 49µm and 19µm, we are able to conclude that homogeneous freezing is a volume-proportional process and that surface nucleation might only be important, if at all, for much smaller droplets.

Supercooled Water Drops Do Not Freeze During Impact on Hybrid Janus Particle-Based Surfaces

2018 ◽  
Vol 31 (1) ◽  
pp. 112-123 ◽  
Author(s):  
Madeleine Schwarzer ◽  
Thomas Otto ◽  
Markus Schremb ◽  
Claudia Marschelke ◽  
Hisaschi T. Tee ◽  
...  
Keyword(s):  
Supercooled Water ◽  
Janus Particle ◽  
Water Drops
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