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Multifuncional organic-inorganic hybrids based on silk, biocellulose and vegetable oils

Ribeiro S.J.L., Silva R.R., Vorpagel A.J., Santos M.V. Santos, Santos D.B., Cavicchioli M., Christovam L.M., Messaddeq Y., Pecoraro E., Trovati E., Barud H.S.
Instituto de Química- UNESP

New organic-inorganic hybrids have benn obtaining by using three different hosts: biocellullose (BC), fibroin and ricinoleic acid (RA). BC is produced in carbohydrate rich culture medium by Gluconacetobacter xylinus strains in the form of highly hydrated (98% water) membranes. The chemical structure is the same of the one found for plants cellulose but BC presents a pure cellulose network composed of a random assembly of ribbon shaped fibers less than 100 nm wide. The unique properties provided by the nanometric structure have lead to a number of different applications ranging from opto-electronics to medicine including, food industry [1]. Silks on the other side are the strongest and toughest natural fibers known. Silk fibroin extracted from cocoons of Bombyx mori silkworm can be processed as hydrogels, optical films, controlled-release coatings, 3D porous matrices and fibers [2]. Castor oil is a natural oil obtained from the seed of the so-called castor plant. It is unique due to the fact that it is composed of approximately 90% of the hydroxy, unsaturated C18 fatty acid, ricinoleic acid. New organic-inorganic amidosil hybrids are obtained from the reaction of RA and amino-modified siloxanes. We have been exploring the multifunctional character of these three host materials by studying luminescence (photoluminescence and upconversion) and redox properties of derived membranes. Metal colloids (Te, Ag, Au, Ag-Au) containing membranes have been obtained either by light induced process or by using well known reducing agents. Luminescence is being explored by obtaining lanthanide containing luminescent materials from BC/fibroin/amidosil membranes and Eu3+ complexes of sylilated or not beta-diketonate ligands and Yb3+-Ln (Ln- Tm3+, Er3+ and Ho3+) pairs. The interaction metal colloids- luminescent centers, mediated by the host, is explored aiming new photonic applications. References [1] "Bacterial Cellulose from Glucanacetobacter xylinus: Preparation, Properties and Applications", E. Pecoraro, D. Manzani, Y. Messaddeq, S. J.L. Ribeiro, Ch. 17 pp369-383 in Monomers, Polymers and Composites from Renewable Resources. Ed.: M.N. Belgacem and A. Gandini, ISBN: 978-0-08-045316-3 2008 Elsevier Ltd [2] S.T. Parker, P. Domachuk, J. Amsden, J. Bressner, J.A. Lewis, D.L. Kaplan, F.G. Omenetto, Adv. Mater. 2009, 21, 241

 

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