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Nucleation of Zinc Crystals in Multilayer Adsorption
Author(s) -
Gretz R. D.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670230203
Subject(s) - nucleation , monolayer , supersaturation , crystallite , adsorption , zinc , tungsten , substrate (aquarium) , materials science , chemical physics , chemical engineering , crystallography , chemistry , nanotechnology , metallurgy , organic chemistry , oceanography , geology , engineering
The adpopulation of zinc which is critical for an appreciable nucleation rate of crystallites on clean tungsten field emitter tips has been measured. This critical adconcentration is 2.7 monolayers for zinc, independent of temperature from 75 °K to above room temperature. This phenomena can be described by none of the existing theories of heterogeneous nucleation because all of these theories presuppose that adsorption prior to nucleation is less than a monolayer. For concentrations greater than a monolayer, the exact supersaturation at the substrate becomes indeterminate.