Abstract
The adsorption isotherms for n-aliphatic alcohols (C 1C 4) have been obtained on two alumina surfaces of widely different surface area. The isotherms exhibit strong monolayer binding with little tendency toward multilayer formation. However, attempts to ascribe all multilayer adsorption to pendular ring condensate were not successful, and some multilayer contribution remains at high relative pressures. The residual multilayer character is higher for the low specific surface area alumina and decreases for both surfaces in going from C 1 to C 4. The enhanced multilayer character for the low area alumina is understandable in terms of its supposedly higher electrostatic field strength. The variation with hydrocarbon chain length is due to a gradual isolation of the surface from any multilayer adsorption in the context of previously developed autophobicity concepts presuming strongly oriented first-layer adsorption.
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