scholarly journals Synthesis of water ice particles in a plasma chamber

2010 ◽  
Vol 115 (D18) ◽  
Author(s):  
S. Shimizu ◽  
B. Klumov ◽  
T. Shimizu ◽  
H. Rothermel ◽  
O. Havnes ◽  
...  
Keyword(s):  
Water Ice ◽  
Plasma Chamber ◽  
Ice Particles

scholarly journals THE STICKINESS OF MICROMETER-SIZED WATER-ICE PARTICLES

2014 ◽  
Vol 798 (1) ◽  
pp. 34 ◽  
Author(s):  
B. Gundlach ◽  
J. Blum
Keyword(s):  
Water Ice ◽  
Ice Particles

scholarly journals Micrometer-sized Water Ice Particles for Planetary Science Experiments: Influence of Surface Structure on Collisional Properties

2017 ◽  
Vol 848 (2) ◽  
pp. 96 ◽  
Author(s):  
S. Gärtner ◽  
B. Gundlach ◽  
T. F. Headen ◽  
J. Ratte ◽  
J. Oesert ◽  
...  
Keyword(s):  
Surface Structure ◽  
Planetary Science ◽  
Water Ice ◽  
Ice Particles

scholarly journals Polarimetry of Water Ice Particles Providing Insights on Grain Size and Degree of Sintering on Icy Planetary Surfaces

2018 ◽  
Vol 123 (10) ◽  
pp. 2564-2584 ◽  
Author(s):  
O. Poch ◽  
R. Cerubini ◽  
A. Pommerol ◽  
B. Jost ◽  
N. Thomas
Keyword(s):  
Grain Size ◽  
Planetary Surfaces ◽  
Water Ice ◽  
Ice Particles

Investigation of the Formation and the Applications of Ice Powder

2002 ◽  
Author(s):  
D. V. Shishkin ◽  
E. S. Geskin ◽  
B. Goldenberg
Keyword(s):  
Precision Machining ◽  
Water Ice ◽  
Ice Particles ◽  
Waterjet Machining ◽  
Hypothetical Mechanism ◽  
Auto Parts ◽  
Is Integration ◽  
Ice Powder ◽  
Set Up ◽  
Polished Metal

Water ice powder constitutes a potentially important manufacturing tool. Availability and cleanliness of this powder constitute its major advantage. It was shown that the ice particles can be used as an abrasive in the course of waterjet machining. Although the erosion potential of ice particle is inferior to that of the conventional abrasives the environmental soundness of ice enables us to expend the use of the ice abrasive jets on food industry, medicine, precision machining, etc. The principal issue in the use of the ice abrasives is particles formation. Analysis of various technologies showed that the most effective avenue in particles production is integration of the water freezing and ice decomposition. As the results, the desired flow rate of ice particles at the desired temperature and size distribution can be generated. The objective of the presented paper was the experimental investigation of the production of ice particles. An experimental set up was constructed and used for particles fabrication at controlled conditions. The acquired information was applied for the analysis of the phenomena leading to the particles formation. As the result a hypothetical mechanism of the ice decomposition was suggested and validated. The experiments involving the decontamination of the electronic devices, semiconductors, fabric, leather, food products, polished metal, soft plastics, rusted auto parts, etc were carried out in order to demonstrate the potential application of the ice blasting.

scholarly journals Ice Condensation as a Planet Formation Mechanism

2013 ◽  
Vol 8 (S299) ◽  
pp. 382-383
Author(s):  
Katrin Ros
Keyword(s):  
Formation Mechanism ◽  
Time Scale ◽  
Planet Formation ◽  
Particle Growth ◽  
Dynamical Behaviour ◽  
Water Ice ◽  
Ice Particles ◽  
Size Evolution ◽  
Protoplanetary Discs

AbstractParticles in protoplanetary discs grow rapidly to millimetre-sizes via coagulation, but further growth to centimetre-sized pebbles is not yet completely understood. We investigate particle growth by ice condensation in a model where we take the dynamical behaviour of vapour and ice particles into account, as well as the size evolution due to condensation and sublimation. Our results show that efficient growth from dust to pebbles is possible close to the water ice line at ~3 AU, with particles growing from millimetres to decimetres on a time scale of 10000 yr.

scholarly journals Charging of mesospheric aerosol particles: the role of photodetachment and photoionization from meteoric smoke and ice particles

2009 ◽  
Vol 27 (6) ◽  
pp. 2417-2422 ◽  
Author(s):  
M. Rapp
Keyword(s):  
Electron Capture ◽  
Aerosol Particles ◽  
Pure Water ◽  
Electron Attachment ◽  
Water Ice ◽  
Ice Particles ◽  
Repeated Observation ◽  
Meteoric Smoke ◽  
Positively Charged

Abstract. Time constants for photodetachment, photoemission, and electron capture are considered for two classes of mesospheric aerosol particles, i.e., meteor smoke particles (MSPs) and pure water ice particles. Assuming that MSPs consist of metal oxides like Fe2O3 or SiO, we find that during daytime conditions photodetachment by solar photons is up to 4 orders of magnitude faster than electron attachment such that MSPs cannot be negatively charged in the presence of sunlight. Rather, even photoemission can compete with electron capture unless the electron density becomes very large (>>1000 cm−3) such that MSPs should either be positively charged or neutral in the case of large electron densities. For pure water ice particles, however, both photodetachment and photoemission are negligible due to the wavelength characteristics of its absorption cross section and because the flux of solar photons has already dropped significantly at such short wavelengths. This means that water ice particles should normally be negatively charged. Hence, our results can readily explain the repeated observation of the coexistence of positive and negative aerosol particles in the polar summer mesopause, i.e., small MSPs should be positively charged and ice particles should be negatively charged. These results have further important implications for our understanding of the nucleation of mesospheric ice particles as well as for the interpretation of incoherent scatter radar observations of MSPs.

scholarly journals Photophoresis on water-ice particles induced by thermal radiation in protoplanetary discs

2012 ◽  
Vol 58 ◽  
pp. 209-212
Author(s):  
J. van Eymeren ◽  
T. Kelling ◽  
G. Wurm ◽  
S. Hagenacker
Keyword(s):  
Thermal Radiation ◽  
Water Ice ◽  
Ice Particles ◽  
Protoplanetary Discs

scholarly journals Technical Note: VUV photodesorption rates from water ice in the 120–150 K temperature range – significance for Noctilucent Clouds

2010 ◽  
Vol 10 (10) ◽  
pp. 22653-22668 ◽  
Author(s):  
M. Yu. Kulikov ◽  
A. M. Feigin ◽  
S. K. Ignatov ◽  
P. G. Sennikov ◽  
Th. Bluszcz ◽  
...  
Keyword(s):  
Gas Phase ◽  
Solid Phase ◽  
High Vacuum ◽  
Technical Note ◽  
Solar Irradiation ◽  
Recombination Reaction ◽  
Noctilucent Clouds ◽  
Water Ice ◽  
Temperature Range ◽  
Ice Particles

Abstract. Laboratory studies have been carried out with the aim to improve our understanding of physicochemical processes which take place at the interface water ice/air initiated by solar irradiation with a wavelength of 121.6 nm. It was intended to mimic the processes of ice particles characteristic for Noctilucent Clouds (NLCs). The experimental set-up used includes a high-vacuum chamber, a gas handling system, a cryostat with temperature controller, a FTIR spectrometer, a vacuum ultraviolet hydrogen lamp and a microwave generator. We report the first results of measurements of the absolute photodesorption rate (loss of substance due to the escape of photoproducts into gas phase) from thin (20–100 nm) water ice samples kept in the temperature range of 120–150 K. The obtained results show that a flow of photoproducts into the gas phase is considerably lower as presumed in a recent study by Murray and Plane (2005). The experiments indicate that almost all photoproducts remain in the solid phase, and the principal chemical reaction between them is the recombination reaction H + OH→H2O which is evidently very fast. This means that direct photolysis of mesospheric ice particles seems to have no significant impact on the gas phase chemistry of the upper mesosphere.

Sign in / Sign up

Export Citation Format

Share Document