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Bioinspired catechol-terminated self-assembled monolayers with enhanced adhesion properties

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10.1002/smll.201302406
 
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hdl:2117/21504

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Guardingo, Mireia
Bellido, Elena
Miralles Lluma, Rosa
Faraudo, Jordi
Sedó, Josep
Tatay, Sergio
Verdaguer Prats, Albert
Busqué, Felix
Ruiz-Molina, Daniel
Document typeArticle
Defense date2013-12-19
Rights accessRestricted access - publisher's policy
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
The role of the catechol moiety in the adhesive properties of mussel proteins and related synthetic materials has been extensively studied in the last years but still remains elusive. Here, a simplified model approach is presented based on a self-assembled monolayer (SAM) of upward-facing catechols thiol-bound to epitaxial gold substrates. The orientation of the catechol moieties is confirmed by spectroscopy, which also showed lack of significant amounts of interfering o-quinones. Local force-distance curves on the SAM measured by atomic force microscopy (AFM) shows an average adhesion force of 45 nN, stronger than that of a reference polydopamine coating, along with higher reproducibility and less statistical dispersion. This is attributed to the superior chemical and topographical homogeneity of the SAM coating. Catechol-terminated SAMs are also obtained on high-roughness gold substrates that show the ability to assemble magnetic nanoparticles, despite their lack of enhanced adhesion at the molecular level. Finally, the influence of the catechol group on the formation and quality of the SAM is explored both theoretically (molecular dynamics simulations) and experimentally using direct-write AFM lithography.
CitationGuardingo, M. [et al.]. Bioinspired catechol-terminated self-assembled monolayers with enhanced adhesion properties. "Small", 19 Desembre 2013, p. 1-9. 
URIhttp://hdl.handle.net/2117/21504
DOI10.1002/smll.201302406
ISSN1613-6810
Publisher versionhttp://onlinelibrary.wiley.com/doi/10.1002/smll.201302406/abstract
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