title: Bio-nanocomposites by assembling of gelatin and layered perovskite mixed oxides.
abstract: A new class of bio-nanocomposites based on hybrid gelatin-perovskite hydrogels was prepared by mixing exfoliated perovskite-tetraalkylammonium species in aqueous suspensions with gelatin solutions. Colloidal nanosheets derived from the CsCa2Nb3O10 layered perovskite re-stacked in the gelatin solutions give bio-nanocomposite materials with different content in the inorganic moiety. These films can be easily processed as homogeneous self-supported films. The partial exfoliation of the pristine mixed oxide is produced from alkylammonium exchanged phases, being the tetraalkylammonium ions (tetraethylammonium, TEA+) an efficient intermediate to give the colloid phase constituted by well exfoliated materials useful to generate homogeneous films. The nanosheets are highly oriented in the bio-nanocomposite films in agreement with the XRD patterns and the FTIR dichroism. This orientation could be considered as a characteristic of this type of hybrid materials leading to new potential applications. In this way, we have observed that the assembling of perovskite to gelatin produces a greater increase of the dielectric permittivity than the dielectric loss in the studied samples.
authors.affiliation: Departamento de Química Inorgánica I, UCM, Avda. Complutense s/n, 28040 Madrid, Spain.
authors.forename: Ana I
authors.initials: AI
authors.lastname: Ruiz
authors.forename: Margarita
authors.initials: M
authors.lastname: Darder
authors.forename: Pilar
authors.initials: P
authors.lastname: Aranda
authors.forename: Ricardo
authors.initials: R
authors.lastname: Jiménez
authors.forename: Henri
authors.initials: H
authors.lastname: Van Damme
authors.forename: Eduardo
authors.initials: E
authors.lastname: Ruiz-Hitzky
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D004553:Electric Conductivity; D005780:Gelatin / Q000737:chemistry* / Q000648:ultrastructure; D020100:Hydrogels; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D017610:Calcium Compounds; D020100:Hydrogels; D010087:Oxides; C059910:perovskite; D005780:Gelatin; D014025:Titanium