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A METHOD FOR THE DETERMINATION OF THE RELATIVE SURFACE AREAS OF POWDERED MATERIALS 1
Author(s) -
Koealer W. A.
Publication year - 1926
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.1151-2916.1926.tb18350.x
Subject(s) - adsorption , fineness , chemistry , analytical chemistry (journal) , degree (music) , alcohol , materials science , mineralogy , chromatography , organic chemistry , physics , acoustics
The ratios of the surfaces of powders of different degrees of fineness are obtained by determining the relative amounts of a radioactive substance, ThB, adsorbed on the surfaces of the powders. The ThB is dissolved in an ammonical solution of water or alcohol, and equal‐weight samples of the various powders are placed in equal volumes of this radioactive solution. After adsorption equilibrium is complete, 10 cc. of the clear supernatant liquid of each sample are evaporated to dryness on watch glasses, and the relative radioactivities of the deposits are measured in an electroscope. Since, for a given concentration of radio‐active solution, the degree of adsorption is not a straight‐line function of the surface exposed, an adsorption curve must be determined for each material studied.