Summary
The effect of the activation temperature of silica gel on the hysteresis effect has been studied. Sorption and desorption of water vapour at 30°C. have been conducted on gels activated at 35° C., 70° C., 140° C., 300° C., 500° C. and 1000° C.
All the gels gave permanent and reproducible hysteresis loops. A marked variation however, was noticed in the total sorptive capacity and the area of the loop.
The results indicate that from 35° C. to 140° C., there is a decrease in the capillary space in the gel but from 140° C. to 500° C., the capillary space remains practically unaltered. Whereas, above 500° C., the gel suffers structural change, the capillaries collapse and there is a marked decrease in the total capillary volume.
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References
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Krishnappa, T., Rao, K.S. & Rao, B.S. Hysteresis in sorption. Proc. Indian Acad. Sci. (Math. Sci.) 25, 174 (1947). https://doi.org/10.1007/BF03171395
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DOI: https://doi.org/10.1007/BF03171395