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Microcalorimeter Adaptation for Measurement of Heats of Adsorption at Solid‐Solution Interfaces
Author(s) -
Harter Robert D.,
Kilcullen Brian M.
Publication year - 1976
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1976.03615995004000040042x
Subject(s) - calorimeter (particle physics) , adsorption , mixing (physics) , sensitivity (control systems) , thermodynamics , process engineering , measuring instrument , energy (signal processing) , flocculation , chemistry , materials science , analytical chemistry (journal) , physics , optics , chromatography , engineering , organic chemistry , quantum mechanics , electronic engineering , detector
The sensitivity of the Calvet Microcalorimeter makes feasible the measurement of very small heats of reaction. This capability is particularly useful when studying adsorption reactions at solid‐solution interfaces. The instrument must, however, be specially adapted for measurements of this type, since it contains no provision for equilibration and mixing of separate solutions. Previously developed adaptations of the instrument are not satisfactory, because they either do not stir the combined solutions adequately to overcome flocculation problems or their mechanical energy input is high. An instrument has been developed whereby two solutions can be equilibrated in the calorimeter cell, then mixed and stirred with a net mechanical energy input of −2 ± 0.4 mcalories. This instrument, therefore, makes possible the precise measurement of very small heats of reaction.