Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment
Authors: Honciuc, Andrei
Howard, Alexander L.
Schwartz, Daniel K.
DOI: 10.1021/jp8051856
Published in: The Journal of Physical Chemistry C
Volume(Issue): 113
Issue: 6
Pages: 2078
Pages to: 2081
Issue Date: 2008
Publisher / Ed. Institution: American Chemical Society
ISSN: 1932-7447
Language: English
Subject (DDC): 540: Chemistry
Abstract: 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.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Appears in collections:Publikationen Life Sciences und Facility Management

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