dc.creatorURZUA, M. D.
dc.creatorBRIONES, X. G.
dc.creatorCARRASCO, L. P.
dc.creatorENCINAS, M. V.
dc.creatorPETRI, D. F. S.
dc.date.accessioned2012-10-20T05:22:32Z
dc.date.accessioned2018-07-04T15:48:38Z
dc.date.available2012-10-20T05:22:32Z
dc.date.available2018-07-04T15:48:38Z
dc.date.created2012-10-20T05:22:32Z
dc.date.issued2010
dc.identifierPOLYMER, v.51, n.15, p.3445-3452, 2010
dc.identifier0032-3861
dc.identifierhttp://producao.usp.br/handle/BDPI/31058
dc.identifier10.1016/j.polymer.2010.05.054
dc.identifierhttp://dx.doi.org/10.1016/j.polymer.2010.05.054
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1627696
dc.description.abstractThe adsorption behavior of several amphiphilic polyelectrolytes of poly(maleic anhydride-alt-styrene) functionalized with naphthyl and phenyl groups, onto amino-terminated silicon wafer has been studied by means of null- ellipsometry, atomic force microscopy (AFM) and contact angle measurements. The maximum of adsorption, Gamma(plateau), varies with the ionic strength, the polyelectrolyte structure and the chain length. Values of Gamma(plateau) obtained at low and high ionic strengths indicate that the adsorption follows the ""screening-reduced adsorption"" regime. Large aggregates were detected in solution by means of dynamic light scattering and fluorescence measurements. However. AFM indicated the formation of smooth layers and the absence of aggregates. A model based on a two-step adsorption behavior was proposed. In the first one, isolated chains in equilibrium with the aggregates in solution adsorbed onto amino-terminated surface. The adsorption is driven by electrostatic interaction between protonated surface and carboxylate groups. This first layer exposes naphtyl or phenyl groups to the solution. The second layer adsorption is now driven by hydrophobic interaction between surface and chains and exposes carboxylate groups to the medium, which repel the forthcoming chain by electrostatic repulsion. Upon drying some hydrophobic naphtyl or phenyl groups might be oriented to the air, as revealed by contact angle measurements. Such amphiphilic polyelectrolyte layers worked well for the building-up of multilayers with chitosan. (C) 2010 Elsevier Ltd. All rights reserved.
dc.languageeng
dc.publisherELSEVIER SCI LTD
dc.relationPolymer
dc.rightsCopyright ELSEVIER SCI LTD
dc.rightsrestrictedAccess
dc.subjectAmphiphilic polyelectrolytes
dc.subjectAmino-terminated surface
dc.subjectSurface adsorption
dc.titleAdsorption of anionic amphiphilic polyelectrolytes onto amino-terminated solid surfaces
dc.typeArtículos de revistas


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