Universal Functional Activity Coefficient Research Articles

Group unary Wilson model for liquid mixtures without arbitrary parameters

Unary parameters for the components in a mixture were estimated earlier by fitting experimental phase equilibria data, using a previously derived model for the prediction of vapour-liquid equilibria in binary and multicomponent systems. It has been possible to express the unary parameters in terms of well-known physical constants of a compound. This “parameterless model” has been found to predict vapour-liquid equilibria quite well. Comparison shows this model to be nearly as good as UNIFAC (universal functional group activity coefficient model).

Universal functional group activity coefficient model in electrosorption. 3. Thermodynamical excess mixing functions of the 1-propanol-water system adsorbed at the mercury electrode

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUniversal functional group activity coefficient model in electrosorption. 3. Thermodynamical excess mixing functions of the 1-propanol-water system adsorbed at the mercury electrodeMarian KarolczakCite this: Langmuir 1990, 6, 6, 1045–1050Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://doi.org/10.1021/la00096a003RIGHTS & PERMISSIONSArticle Views47Altmetric-Citations-LEARN 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 (745 KB) Get e-Alerts Get e-Alerts

Universal functional group activity coefficient model in electrosorption. 2. Electrosorption of 1-propanol at the mercury-solution interface

L'electroadsorption du propan-1-ol sur une electrode de mercure a partir d'une solution aqueuse de sulfate de sodium est mesuree grâce a un electrometre capillaire assiste par un ordinateur

Universal functional group activity coefficient model in electrosorption: Part I. Theory

The equations for the activity coefficients and the corresponding excess electrochemical Gibbs energy of mixing of surface solutions in a Universal Functional Group Activity Coefficient (UNIFAC) model for a general case of multicomponent surface mixture, have been derived. Next, the general equations were simplified and used to describe the electrosorption of 1-propanol at a mercury electrode. Sample theoretical investigations of other binary systems were also carried out. In the future the presented theory should make it possible to identify, compile, and universally use the characteristic contributions resulting from different functional groups. It is also shown that the surface pressure equation that has been used for many years in literature and treated as approximate, can be alternatively interpreted. A flexible and general expression for the excess electrochemical. Gibbs energy of mixing function, δ G ̄ E , which could be used in our generalized theory of electrosorption has been derived. Additionally the corresponding equation for the electrosorption isotherm expressed in terms of surface coverage has been presented.

An application of the universal functional group activity coefficient model to electrosorption

The UNIFAC theory originally proposed by Fredenslund et al. has been adopted to describe non-congruent electrosorption of a variety of organic compounds. In this theory each functional group of a compound contributes to the activity coefficients as well as to the excess electrochemical Gibbs energy of mixing in the adsorbed layer. The equations for the activity coefficients as well as for the excess electrochemical Gibbs energy of mixing of a surface solution of the general case of multicomponent mixtures, have been derived. Next, the general equations were simplified and used to describe the electrosorption of 1-propanol at the mercury electrode. Sampled theoretical investigations of other binary systems were also carried out. In the future this theory should make it possible to identify, compile and use universally the characteristic contributions resulting from different functional groups.