Adsorption of water vapour on evaporated germanium films. An Infrared Study

1979 ◽  
Vol 75 (0) ◽  
pp. 962 ◽  
Author(s):  
Alan Metcalfe ◽  
S. Ude Shankar
Keyword(s):  
Water Vapour ◽  
Infrared Study ◽  
Adsorption Of Water ◽  
Germanium Films

scholarly journals Adsorption of Water Vapour by Zinc Oxide, II

1949 ◽  
Vol 70 (1-2) ◽  
pp. 3-4
Author(s):  
Yutaka Miyahara ◽  
Isamu Sano
Keyword(s):  
Zinc Oxide ◽  
Water Vapour ◽  
Adsorption Of Water

Adsorption of Water Vapour on a Cleavage Surface of Lithium Fluoride

1962 ◽  
Vol 1 (4) ◽  
pp. 234-234 ◽  
Author(s):  
Koreo Kinosita ◽  
Hiroomi Kojima ◽  
Hideshi Yokota
Keyword(s):  
Water Vapour ◽  
Lithium Fluoride ◽  
Cleavage Surface ◽  
Adsorption Of Water

Study of the reaction CaSO4.½H2O (β-hemihydrate) = CaSO4 (β-soluble anhydrite)+½H2O in the temperature range 20–100° C

1965 ◽  
Vol 34 (268) ◽  
pp. 327-345 ◽  
Author(s):  
J. D. C. McConnell
Keyword(s):  
Water Vapour ◽  
Vapour Pressure ◽  
Physical Adsorption ◽  
Linear Increase ◽  
Water Vapour Pressure ◽  
Hydration Reaction ◽  
Temperature Range ◽  
Dehydration Reactions ◽  
Adsorption Of Water ◽  
Hydration And Dehydration

SummaryA thermogravimetric vacuum microbalance has been used to study the reaction between β-soluble anhydrite and water vapour in the temperature range 20–100° C. Equilibrium water-vapour pressures for the hydration reaction in this temperature range were determined directly and have been compared with available data obtained by Kelly, Southard, and Anderson (1941) in the temperature range 80–120° C. The kinetics of the hydration and dehydration reactions have also been studied in a series of isothermal experiments with varying water-vapour pressure. These experiments indicate that in a vapour-pressure range close to the equilibrium value very low rates for both hydration and dehydration are observed. Outside this range of vapour pressures both hydration and dehydration rates increase suddenly and show an approximately linear increase with imposed water-vapour pressure.At low temperatures (25° C) the dehydration reaction has an associated activation energy of approximately 10 kcal mole−1. In the same temperature range additional, physical adsorption of water vapour by the specimen was noted.

scholarly journals Changes in the Adsorption Properties of Activated Carbon due to Partial Oxidation of the Surface

1995 ◽  
Vol 12 (3) ◽  
pp. 211-219 ◽  
Author(s):  
A.M. Youssef ◽  
A.A. El-Khouly ◽  
A.I. Ahmed ◽  
E.I. El-Shafey
Keyword(s):  
Water Vapour ◽  
Surface Coverage ◽  
Activated Carbons ◽  
Textural Properties ◽  
Isosteric Heat ◽  
Adsorption Properties ◽  
Adsorption Of Water ◽  
Oxygen Groups ◽  
Initial Adsorption ◽  
Entropy Of Adsorption

The textural properties (surface area and porosity) of activated carbons change upon treatment with oxidizing solutions. The extent of this change is related to the strength of the oxidizing agent. Oxidation also changes the chemistry of the surface by forming carbon–oxygen groups which are the sites upon which the initial adsorption of water vapour takes place. The adsorption of water vapour at 300–320 K is mainly physical and the isosteric heat of adsorption decreases continuously as the surface coverage increases. The entropy of adsorption of water vapour on untreated and oxidized carbons, at different adsorption temperatures, has been calculated.

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