ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 22, Number 6
JKCSEZ 22(6)
December 20, 1978 

Adsorption isotherms of o-xylene on Spheron 6, a graphitized carbon black, are obtained at various temperatures using a quartz beam microbalance. BET plots are made to estimate the molecular area of o-xylene from these isotherms. On Spheron 6, the molecular area of o-xylene (m.p -25℃) remains constant until the temperature is increased up to -15℃, but increases abruptly between -15℃ and -14℃, and then again remains constant thereafter. These results are interpreted as implying that the adsorbed o-xylene molecules are flatly localized on Spheron 6 with compact packing below -15℃ while they gain a rotational degree of freedom around the benzene ring at the higher temperature.