Publikationstyp: Beitrag in wissenschaftlicher Zeitschrift
Art der Begutachtung: Peer review (Publikation)
Titel: Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment
Autor/-in: Honciuc, Andrei
Howard, Alexander L.
Schwartz, Daniel K.
DOI: 10.1021/jp8051856
Erschienen in: The Journal of Physical Chemistry C
Band(Heft): 113
Heft: 6
Seiten: 2078
Seiten bis: 2081
Erscheinungsdatum: 2008
Verlag / Hrsg. Institution: American Chemical Society
ISSN: 1932-7447
Sprache: Englisch
Fachgebiet (DDC): 540: Chemie
Zusammenfassung: Total internal reflection fluorescence microscopy was used to obtain real-time images of individual fluorescently labeled hexadecanoic acid molecules as they absorbed at the aqueous-fused silica interface. In contrast with laterally averaged ensemble measurements of surface coverage versus time, single-molecule observations provide direct, model-independent measurements of adsorption kinetics. Additionally, since the observations were made under steady-state conditions at extremely low coverage, effects due to transport kinetics did not influence the results, permitting accurate measurement of the fundamental attachment rate as a function of temperature, that is, the rate at which molecules are transferred to the surface from the subsurface layer. We found that the attachment rate systematically increased with increasing temperature; an Arrhenius analysis gave an activation energy of Ea = 19 ± 2 kJ/mol. We hypothesize that this energy, which is similar in magnitude to the strength of an OH···O hydrogen bond, is associated with the displacement of a water molecule from the silica surface.
Volltext Version: Publizierte Version
Lizenz (gemäss Verlagsvertrag): Lizenz gemäss Verlagsvertrag
Departement: Life Sciences und Facility Management
Organisationseinheit: Institut für Chemie und Biotechnologie (ICBT)
Enthalten in den Sammlungen:Publikationen Life Sciences und Facility Management

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