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dc.contributor.authorHonciuc, Andrei-
dc.contributor.authorBaptiste, Denver Jn.-
dc.contributor.authorCampbell, Ian P.-
dc.contributor.authorSchwartz, Daniel K.-
dc.date.accessioned2018-12-12T07:41:15Z-
dc.date.available2018-12-12T07:41:15Z-
dc.date.issued2009-
dc.identifier.issn0743-7463de_CH
dc.identifier.issn1520-5827de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/13759-
dc.description.abstractSingle-molecule total internal reflection fluorescence microscopy was used to obtain real-time images of fluorescently labeled hexadecanoic (palmitic) acid molecules as they adsorbed at the interface between fused silica and three different solvents: hexadecane (HD), tetrahydrofuran (THF), and water. These solvents were chosen to explore the effect of solvent polarity on the activation energy associated with the attachment rate, i.e., the rate at which molecules were transferred to the surface from the near-surface layer. Direct counting of single-molecule events, made under steady-state conditions at extremely low coverage, provided direct, model-independent measurements of this attachment rate, in contrast with conventional ensemble-averaged methods, which are influenced by bulk transport and competing detachment processes. We found that the attachment rate increased with increasing temperature for all solvents. Arrhenius analyses gave activation energies of 5+/-2 kJ/mol for adsorption from HD, 10+/-2 kJ/mol for adsorption from THF, and 19+/-2 kJ/mol for adsorption from water. These energies increased systematically with the solvent polarity and, therefore, with the expected strength of the solvent-substrate interaction. We hypothesize that the adsorption of amphiphilic solute molecules from solution can be regarded as a competitive exchange between solute molecules and surface-bound solvent. In this scenario, adsorption is an activated process, and the activation energy for attachment is associated with the solvent-substrate interaction energy.de_CH
dc.language.isoende_CH
dc.publisherAmerican Chemical Societyde_CH
dc.relation.ispartofLangmuirde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subject.ddc540: Chemiede_CH
dc.titleSolvent dependence of the activation energy of attachment determined by single molecule observations of surfactant adsorptionde_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/la900307fde_CH
dc.identifier.pmid19563226de_CH
zhaw.funding.euNode_CH
zhaw.issue13de_CH
zhaw.originated.zhawNode_CH
zhaw.pages.end7392de_CH
zhaw.pages.start7389de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume25de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
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Honciuc, A., Baptiste, D. Jn., Campbell, I. P., & Schwartz, D. K. (2009). Solvent dependence of the activation energy of attachment determined by single molecule observations of surfactant adsorption. Langmuir, 25(13), 7389–7392. https://doi.org/10.1021/la900307f
Honciuc, A. et al. (2009) ‘Solvent dependence of the activation energy of attachment determined by single molecule observations of surfactant adsorption’, Langmuir, 25(13), pp. 7389–7392. Available at: https://doi.org/10.1021/la900307f.
A. Honciuc, D. Jn. Baptiste, I. P. Campbell, and D. K. Schwartz, “Solvent dependence of the activation energy of attachment determined by single molecule observations of surfactant adsorption,” Langmuir, vol. 25, no. 13, pp. 7389–7392, 2009, doi: 10.1021/la900307f.
HONCIUC, Andrei, Denver Jn. BAPTISTE, Ian P. CAMPBELL und Daniel K. SCHWARTZ, 2009. Solvent dependence of the activation energy of attachment determined by single molecule observations of surfactant adsorption. Langmuir. 2009. Bd. 25, Nr. 13, S. 7389–7392. DOI 10.1021/la900307f
Honciuc, Andrei, Denver Jn. Baptiste, Ian P. Campbell, and Daniel K. Schwartz. 2009. “Solvent Dependence of the Activation Energy of Attachment Determined by Single Molecule Observations of Surfactant Adsorption.” Langmuir 25 (13): 7389–92. https://doi.org/10.1021/la900307f.
Honciuc, Andrei, et al. “Solvent Dependence of the Activation Energy of Attachment Determined by Single Molecule Observations of Surfactant Adsorption.” Langmuir, vol. 25, no. 13, 2009, pp. 7389–92, https://doi.org/10.1021/la900307f.


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