{"term":{"id":"02627","doi":"10.1351\/goldbook.G02627","code":"G02627","status":"current","longtitle":"IUPAC Gold Book - Gibbs adsorption","title":"Gibbs adsorption","termversion":"2.3.3","lastupdated":"2014-02-24","definitions":[{"id":"1","text":"The surface excess amount or Gibbs adsorption of component i, n i σ, which may be positive or negative, is defined as the excess of the amount of this component actually present in the system over that present in a reference system of the same volume as the real system and in which the bulk concentrations in the two phases remain uniform up to the Gibbs dividing surface. That is n i σ = n i- V α c i α- V β c is the total amount of the component i in the system, ciα and ciβ are the concentrations in the two bulk phases α and β, and V α and V β are the volumes of the two phases defined by the Gibbs surface.","links":[{"title":"surface excess","type":"goldify","url":"https:\/\/goldbook.iupac.org\/terms\/view\/S06171"},{"title":"Gibbs dividing surface","type":"internal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/G02635"}],"math":[{"alttext":"i","latex":"i"},{"alttext":"n i σ","latex":"n_{i}^{\\sigma }"},{"alttext":"n i σ = n i- V α c i α- V β c ","latex":"n_{i}^{\\sigma }=n_{i}- V^{\\alpha }\\ c_{i}^{\\alpha }- V^{\\beta }\\ c_{i}^{\\beta }"},{"alttext":"n i","latex":"n_{i}"},{"alttext":"i","latex":"i"},{"alttext":"ciα","latex":"c_{i}^{\\alpha }"},{"alttext":"ciβ","latex":"c_{i}^{\\beta }"},{"type":"symbol","alttext":"α","latex":"\\alpha "},{"alttext":"β","latex":"\\beta "},{"alttext":"V α","latex":"V^{\\alpha }"},{"alttext":"V β","latex":"V^{\\beta }"}],"sources":["PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 588 (https:\/\/doi.org\/10.1351\/pac197231040577)"]}],"links":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/G02627\/html","json":"https:\/\/goldbook.iupac.org\/terms\/view\/G02627\/json","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/G02627\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/G02627\/plain","pdf":"https:\/\/goldbook.iupac.org\/terms\/view\/G02627\/pdf"},"citation":"Citation: 'Gibbs adsorption' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351\/goldbook.G02627","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2024-07-17T09:44:25+00:00"}}