Abstract
The effect of pre-adsorbed water on profiles of adsorption isotherms of water vapor on NaCl powder was investigated. Measurements were also made on volume shrinkage of the powder bed and surface area change of the particles during the water adsorption. And an interrelationship among the above three properties was discussed.Each of the adsorption isotherms obtained showed a stepped increase in the amount of water adsorbed at the vapor pressure where the formation of two molecular layers completed. When the samples were heat-treated at above 200°C or ground in a dry atmosphere, the ratio of the step-width to monolayer capacity in the isotherms decreased. But when the samples were exposed to the repeated cycles of adsorbing ca. two layers of water followed by outgassing at room temperature, the above ratio was restored to the value for the untreated salt. When the amount of water adsorbed exceeded three layers, the powder particles began to aggregate and the surface area decreased.
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