Physical adsorption studies of simple nonpolar hydrocarbon vapors on ice are described. The isotherms obtained cover a temperature range of from −96°C to −30°C, or up to roughly the temperature where drastic sintering occurs. Results are compared to existing data for hydrocarbon adsorption on liquid water.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDermatometry for coedsArthur W. Adamson , K. Kunichika , F. Shirley , and M. Orem Cite this: J. Chem. Educ. 1968, 45, 11, 702Publication Date (Print):November 1, 1968Publication History Received3 August 2009Published online1 November 1968Published inissue 1 November 1968https://doi.org/10.1021/ed045p702Request reuse permissionsArticle Views184Altmetric-Citations14LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (2 MB) Get e-Alertsclose Get e-Alerts
Ice powder prepared at 77°K. gives nitrogen adsorption isotherms indicating a fairly uniform and not highly polar surface. Annealing at −70°C. leads to adsorption behavior characteristic of a nonpolar surface such as Teflon, and surface inertness towards nitrogen reaches an extreme in the case of snow samples.
The two principal criteria used to evaluate the physical nature of the physically adsorbed state, namely, fit-to-model isotherm equations and comparison of entropy quantities, are examined for the situation of a heterogeneous surface. It is concluded that even for quite homogeneous surfaces, the possibility of some heterogeneity offers enough scope to erase the differences between adsorption isotherms derived from different models.
