| 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 1932-7455 |
| 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. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/13742 |
| 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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