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dc.contributor.authorHonciuc, Andrei-
dc.contributor.authorSchwartz, Daniel K.-
dc.date.accessioned2018-12-12T07:38:53Z-
dc.date.available2018-12-12T07:38:53Z-
dc.date.issued2009-
dc.identifier.issn0002-7863de_CH
dc.identifier.issn1520-5126de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/13758-
dc.description.abstractIndividual molecules of fluorophore-labeled alkanoic acids with various chain lengths, BODIPY-(CH(2))(n)-COOH (abbreviated as fl-Cn), were observed to adsorb and move at the methylated fused silica-water interface as a function of temperature using total internal reflection fluorescence microscopy. The statistical analysis of squared-displacement distributions indicated that the molecular trajectories were consistent with a diffusive model involving two intertwined modes. The slower mode, typically responsible for <50% of the molecular diffusion time, had a diffusion coefficient of <0.005 mum(2)/s and could not be distinguished from the apparent motions of immobilized molecules because of the limitations of experimental resolution. The faster mode exhibited diffusion coefficients that increased with temperature for all chain lengths, permitting an Arrhenius analysis. Both the effective activation energies and kinetic prefactors associated with the fast-mode diffusion coefficients increased systematically with chain length for fl-C2 through fl-C10; however, fl-C15 did not follow this trend but instead exhibited anomalously small values of both parameters. These observations were considered in the context of hydrophobic interactions between the adsorbate molecules and the methylated surface in the presence of water. Specifically, it was hypothesized that fl-C2, fl-C4, and fl-C10 adopted primarily extended molecular conformations on the hydrophobic surface. The increases in activation energy and entropy with chain length for these molecules are consistent with a picture of the transition state in which the molecule partially detaches from the surface and exhibits greater conformational freedom. In contrast, the small activation energy and entropy for fl-C15 are consistent with a scenario in which the surface-bound molecule adopts a compact/globular conformation with limited surface contact and conformational flexibility.de_CH
dc.language.isoende_CH
dc.publisherAmerican Chemical Societyde_CH
dc.relation.ispartofJournal of the American Chemical Societyde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectAdsorptionde_CH
dc.subjectDiffusionde_CH
dc.subjectHydrophobic and hydrophilic interactionsde_CH
dc.subjectKineticsde_CH
dc.subjectSilicon dioxidede_CH
dc.subjectSurface propertiesde_CH
dc.subjectSurface-active agentsde_CH
dc.subjectTemperaturede_CH
dc.subjectThermodynamicsde_CH
dc.subjectTrimethylsilyl compoundsde_CH
dc.subjectWaterde_CH
dc.subject.ddc540: Chemiede_CH
dc.titleProbing hydrophobic interactions using trajectories of amphiphilic molecules at a hydrophobic/water interfacede_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementLife Sciences und Facility Managementde_CH
zhaw.organisationalunitInstitut für Chemie und Biotechnologie (ICBT)de_CH
dc.identifier.doi10.1021/ja900607gde_CH
dc.identifier.pmid19338306de_CH
zhaw.funding.euNode_CH
zhaw.issue16de_CH
zhaw.originated.zhawNode_CH
zhaw.pages.end5979de_CH
zhaw.pages.start5973de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume131de_CH
zhaw.publication.reviewNot specifiedde_CH
Appears in collections:Publikationen Life Sciences und Facility Management

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Honciuc, A., & Schwartz, D. K. (2009). Probing hydrophobic interactions using trajectories of amphiphilic molecules at a hydrophobic/water interface. Journal of the American Chemical Society, 131(16), 5973–5979. https://doi.org/10.1021/ja900607g
Honciuc, A. and Schwartz, D.K. (2009) ‘Probing hydrophobic interactions using trajectories of amphiphilic molecules at a hydrophobic/water interface’, Journal of the American Chemical Society, 131(16), pp. 5973–5979. Available at: https://doi.org/10.1021/ja900607g.
A. Honciuc and D. K. Schwartz, “Probing hydrophobic interactions using trajectories of amphiphilic molecules at a hydrophobic/water interface,” Journal of the American Chemical Society, vol. 131, no. 16, pp. 5973–5979, 2009, doi: 10.1021/ja900607g.
HONCIUC, Andrei und Daniel K. SCHWARTZ, 2009. Probing hydrophobic interactions using trajectories of amphiphilic molecules at a hydrophobic/water interface. Journal of the American Chemical Society. 2009. Bd. 131, Nr. 16, S. 5973–5979. DOI 10.1021/ja900607g
Honciuc, Andrei, and Daniel K. Schwartz. 2009. “Probing Hydrophobic Interactions Using Trajectories of Amphiphilic Molecules at a Hydrophobic/Water Interface.” Journal of the American Chemical Society 131 (16): 5973–79. https://doi.org/10.1021/ja900607g.
Honciuc, Andrei, and Daniel K. Schwartz. “Probing Hydrophobic Interactions Using Trajectories of Amphiphilic Molecules at a Hydrophobic/Water Interface.” Journal of the American Chemical Society, vol. 131, no. 16, 2009, pp. 5973–79, https://doi.org/10.1021/ja900607g.


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