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January 24, 2010 | History

Laboratory studies of ice formation via deposition mode nucleation onto mineral dust and N-hexane soot samples 1 edition

Laboratory studies of ice formation via deposition mode nucleation ont ...
Zaminhussein Abdulali Kanji

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Laboratory studies of ice formation via deposition mode nucleation onto mineral dust and N-hexane soot samples.

Published 2006 .
Written in English.

About the Book

Laboratory studies are described whereby the heterogeneous ice nucleating ability of various dust samples was studied for particles mounted on a hydrophobic cold stage. Ice formation is observed using digital photography. The relative humidity with respect to ice (RHIce) and temperature conditions of the flow system are validated by observing (NH4)2SO 4 deliquescence. Four types of solid mineral samples, including authentic Saharan dust, and commercial samples of alumina, silica and montmorillonite, were investigated in the deposition freezing mode. The size of the dust particles ranged from 0.5 to 5 microns, and the temperature range was from 263 to 218 K. With roughly 104 particles present on the cold stage, the onset for ice formation was observed at low relative humidities, between 102 and 108% RHIce, for all samples and temperatures. This indicates that deposition mode nucleation is an efficient mode of ice formation, particularly under the cold temperatures prevalent in the cirrus regime. By contrast, ice deposition onto n-hexane soot particles was not nearly so efficient. Nucleation rates prevalent in the experiment are calculated as a function of relative humidity from a suite of experiments conducted with Saharan dust where the dependence of the onset RHIce as a function of the total dust surface area was measured.

Edition Notes

Source: Masters Abstracts International, Volume: 44-06, page: 2798.

Thesis (M.Sc.)--University of Toronto, 2006.

Electronic version licensed for access by U. of T. users.

ROBARTS MICROTEXT copy on microfiche.

The Physical Object

84 leaves.
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January 24, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page