Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment

Honciuc, Andrei; Howard, Alexander L.; Schwartz, Daniel K.

doi:10.1021/jp8051856

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
Page(s):	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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Honciuc, A., Howard, A. L., & Schwartz, D. K. (2008). Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment. The Journal of Physical Chemistry C, 113(6), 2078–2081. https://doi.org/10.1021/jp8051856

Honciuc, A., Howard, A.L. and Schwartz, D.K. (2008) ‘Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment’, The Journal of Physical Chemistry C, 113(6), pp. 2078–2081. Available at: https://doi.org/10.1021/jp8051856.

A. Honciuc, A. L. Howard, and D. K. Schwartz, “Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment,” The Journal of Physical Chemistry C, vol. 113, no. 6, pp. 2078–2081, 2008, doi: 10.1021/jp8051856.

HONCIUC, Andrei, Alexander L. HOWARD und Daniel K. SCHWARTZ, 2008. Single molecule observations of fatty acid adsorption at the silica/water interface : activation energy of attachment. The Journal of Physical Chemistry C. 2008. Bd. 113, Nr. 6, S. 2078–2081. DOI 10.1021/jp8051856

Honciuc, Andrei, Alexander L. Howard, and Daniel K. Schwartz. 2008. “Single Molecule Observations of Fatty Acid Adsorption at the Silica/Water Interface : Activation Energy of Attachment.” The Journal of Physical Chemistry C 113 (6): 2078–81. https://doi.org/10.1021/jp8051856.

Honciuc, Andrei, et al. “Single Molecule Observations of Fatty Acid Adsorption at the Silica/Water Interface : Activation Energy of Attachment.” The Journal of Physical Chemistry C, vol. 113, no. 6, 2008, pp. 2078–81, https://doi.org/10.1021/jp8051856.