|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|
Howard, Alexander L.
Schwartz, Daniel K.
|Published in:||The Journal of Physical Chemistry C|
|Publisher / Ed. Institution:||American Chemical Society|
|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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