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Ion-conduction pathways in self-organised ureidoarene-heteropolysiloxane hybrid membranes. | LitMetric

Ion-conduction pathways in self-organised ureidoarene-heteropolysiloxane hybrid membranes.

Chemistry

Adaptative Supramolecular Nanosystems Group, Institut Européen des Membranes, ENSCM/UMII/UMR-CNRS 5635, Place Eugène Bataillon, CC 47, 34095 Montpellier, Cedex 5, France.

Published: June 2008

AI Article Synopsis

  • - The paper discusses hybrid organic-inorganic dense membrane materials that allow protons and ions to diffuse through hydrophilic pathways, achieved through a two-step process involving self-assembly and sol-gel transcription.
  • - Initially, specific compounds (3-(ureidoarene)propyltriethoxysilane) create supramolecular oligomers in aprotic solvents, forming organogels that evolve into hybrid membranes at the nanoscale.
  • - The resulting hybrid materials, characterized by a lamellar structure of alternating organic and inorganic layers, have shown promise as effective transport devices for designing solid dense membranes with unique functions.

Article Abstract

This paper reports on hybrid organic-inorganic dense membrane materials in which protons and ions are envisioned to diffuse along the hydrophilic pathways. The hierarchical generation of functional hybrid materials was realised in two steps. First, the self-assembling properties of 3-(ureidoarene)propyltriethoxysilane compounds 1-5 in aprotic solvents were determined, revealing the formation of supramolecular oligomers. Compounds 1-5 generate organogels in chloroform or in acetone, leading in a second sol-gel transcription step to hybrid membrane materials on a nanoscopic scale. The crystal structures of 1-5 indicate that the arrangement is mainly defined by periodic parallel sheets, resulting from the alignment of hydrophobic organic and inorganic silica layers. Hybrid materials MB 1-MB 4, with a similar lamellar structure, define particularly attractive functional transport devices; they are oriented along the organic layers and sandwiched between the two siloxane layers. These systems have been employed successfully to design solid dense membranes and illustrate how the self-organised hybrid materials perform interesting and potentially useful functions.

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Source
http://dx.doi.org/10.1002/chem.200700943DOI Listing

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