Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures

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Rational construction of interfaces based on multicomponent responsive systems in which molecular transport is mediated by structures of nanoscale dimensions has become a very fertile research area in biomimetic supramolecular chemistry. Herein, we describe the creation of hybrid mesostructured inte...

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Autores principales: Brunsen, Annette, Díaz, Carolina, Pietrasanta, Lía I., Yameen, Basit, Ceolín, Marcelo Raúl, Soler Illia, Galo J. A. A., Azzaroni, Omar
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Química
Polymer films
Thin films
Ions
Charge transport
Probes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/113619
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-113619
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Polymer films
Thin films
Ions
Charge transport
Probes
spellingShingle Química
Polymer films
Thin films
Ions
Charge transport
Probes
Brunsen, Annette
Díaz, Carolina
Pietrasanta, Lía I.
Yameen, Basit
Ceolín, Marcelo Raúl
Soler Illia, Galo J. A. A.
Azzaroni, Omar
Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
topic_facet Química
Polymer films
Thin films
Ions
Charge transport
Probes
description Rational construction of interfaces based on multicomponent responsive systems in which molecular transport is mediated by structures of nanoscale dimensions has become a very fertile research area in biomimetic supramolecular chemistry. Herein, we describe the creation of hybrid mesostructured interfaces with reversible gate-like transport properties that can be controlled by chemical inputs, such as protons or calcium ions. This was accomplished by taking advantage of the surface-initiated polymerization of 2-(methacryloyloxy)ethyl phosphate (MEP) monomer units into and onto mesoporous silica thin films. In this way, phosphate-bearing polymer brushes were used as “gatekeepers” located not only on the outer surface of mesoporous thin films but also in the inner environment of the porous scaffold. Pore-confined PMEP brushes respond to the external triggering chemical signals not only by altering their physicochemical properties but also by switching the transport properties of the mesoporous film. The ion-gate response/operation was based on the protonation and/or chelation of phosphate monomer units in which the polymer brush works as an off-on switch in response to the presence of protons or Ca2+ ions. The hybrid meso-architectured interface and their functional features were studied by a combination of experimental techniques including ellipso-porosimetry, cyclic voltammetry, X-ray reflectivity, grazing incidence small-angle X-ray scattering, X-ray photoelectron spectroscopy, and in situ atomic force microscopy. In this context, we believe that the integration of stimuli-responsive polymer brushes into nanoscopic supramolecular architectures would provide new routes toward multifunctional biomimetic nanosystems displaying transport properties similar to those encountered in biological ligand-gated ion channels.
format Articulo
Articulo
author Brunsen, Annette
Díaz, Carolina
Pietrasanta, Lía I.
Yameen, Basit
Ceolín, Marcelo Raúl
Soler Illia, Galo J. A. A.
Azzaroni, Omar
author_facet Brunsen, Annette
Díaz, Carolina
Pietrasanta, Lía I.
Yameen, Basit
Ceolín, Marcelo Raúl
Soler Illia, Galo J. A. A.
Azzaroni, Omar
author_sort Brunsen, Annette
title Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
title_short Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
title_full Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
title_fullStr Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
title_full_unstemmed Proton and Calcium-Gated Ionic Mesochannels: Phosphate-Bearing Polymer Brushes Hosted in Mesoporous Thin Films As Biomimetic Interfacial Architectures
title_sort proton and calcium-gated ionic mesochannels: phosphate-bearing polymer brushes hosted in mesoporous thin films as biomimetic interfacial architectures
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/113619
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