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SURFACE PROPERTIES OF FUSED SALTS AND GLASSES: II, CONTACT ANGLE AND WORK OF ADHESION ON GOLD AND PLÁTINUM IN VARIOUS ATMOSPHERES
Author(s) -
Ellefson Bennett S.,
Taylor Nelson W.
Publication year - 1938
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1938.tb15765.x
Subject(s) - contact angle , platinum , adhesion , oxygen , silicate , materials science , metal , graphite , layer (electronics) , lithium (medication) , chemistry , frit , inorganic chemistry , wetting , chemical engineering , nitrogen , analytical chemistry (journal) , composite material , metallurgy , organic chemistry , medicine , engineering , endocrinology , catalysis
A bstract At 1000°C, drops of sodium silicate (42% Na 2 O) resting on a gold surface showed the same contact angle in vacuo , nitrogen, or oxygen, but on a platinum surface they spread to a thin layer in the presence of oxygen. Lithium metaborate and an enamel cover‐coat frit behaved like the sodium silicate in forming drops on platinum in vacuo and thin films when oxygen was present. The absolute work of adhesion was determined in several cases. This quantity is greater for the metal surfaces than for a surface of electrode graphite. The rate of spreading was shown to depend inversely on the viscosity of the liquid. Photographs are presented to illustrate these observations. Some applications are noted.