Sticking Probabilities in Adsorption from Liquid Solutions: Alkylthiols on Gold

Autor:	Charles T. Campbell, Linda S. Jung
Rok vydání:	2000
Předmět:	chemistry.chemical_classification Materials science General Physics and Astronomy Thermodynamics Langevin equation Chemical kinetics Solvent Adsorption chemistry Physical chemistry Molecule Sticking probability Scaling Alkyl
Zdroj:	Physical Review Letters. 84:5164-5167
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.84.5164
Popis:	The sticking probability, defined as the rate of adsorption per molecular collision with the surface, directly expresses the difficulty encountered by a molecule in scaling the barrier to adsorption. Its prior use has been restricted to adsorption of gases. A method extending this concept to adsorption from liquid solutions is applied to transient measurements of alkylthiol adsorption onto gold from ethanol solutions. The initial sticking probability increases from approximately 10(-8) to approximately 10(-6) with alkyl chain length, implying a stabilization of the transition state by approximately 0.65 kJ/mol per CH2. Since their sticking probabilities in the gas phase are approximately 1.0, the solvent increases the activation free energy by approximately 40 kJ/mol.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e895de81fe035519d1f57e2f634cc5f https://doi.org/10.1103/physrevlett.84.5164 Zobrazit plný text záznamu