Assembly of Decavanadate Polyanions by Collagen Helices: Synthesis of an Hybrid Inorganic-Bioorganic Mmaterial
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0972-AA05-04-QQ02-04
Assembly of Decavanadate Polyanions by Collagen Helices: Synthesis of an Hybrid InorganicBioorganic Mmaterial. Axel Marchal, Nathalie Steunou, Gervaise Mosser, Thibaud Coradin, Jocelyne Maquet, and Jacques Livage Chimie de la Matière Condensée de Paris-UMR CNRS 7574, University Paris 6, 4 place jussieu, T54-E5, Paris, 75252, France
ABSTRACT Vanadium oxide-collagen hybrid nanocomposites were prepared by adding a V2O5 sol to a dilute collagen solution. 51V MAS NMR spectroscopy shows that the inorganic phase is composed of the decavanadate [H2V10O28]4- polyanion and V2O5 ribbon-like particles. The broadening of the 51V signals and the absence of Bragg peaks in the XRD pattern suggest a strong disorder concerning the organization of the V2O5 particles and of the decavanadate species in the composites. Analogous hybrid nanocomposites were obtained with a solution that contains only the decavanadate species, showing that the cohesion in the hydrid material results mainly from electrostatic interactions between decavanadate [H2V10O28]4- polyanions and positively-charged collagen helices. INTRODUCTION For many applications, the optimization of a material performance requires a specific micro-and macrostructural control over its morphology. Therefore, the controlled synthesis of inorganic phases with well-defined size, shape and surface structure is an important objective in materials science. In regard to the significant potentialities of vanadium oxides in different technological applications [1,2], the fabrication of these materials in a nanostructured form is an attractive goal. For example, in the field of electrochemistry, nanocomposites of vanadium pentoxide with conducting polymers are promising materials for positive electrode in lithium batteries [3]. Accordingly, vanadium oxide nanotubes are strongly anisotropic materials that can serve as nanoscale electrodes for lithium batteries [4]. Biomimetic syntheses that involve the use of organic or bioorganic polymers are promising approaches for the preparation of inorganic materials with unusual morphology. This chemical process that has already been reported for a large variety of inorganic materials including silica and transition metal oxides [5,6] is mainly based on a control of the inorganic polymerization by specific interactions between inorganic and organic functions. In this paper, we report the synthesis of vanadium oxide-collagen nanocomposites prepared by the reaction of a dilute solution of collagen and a sol of V2O5 ribbon-like particles. These hybrid materials were characterized by X-ray diffraction, SEM, TEM and 51V MAS NMR spectroscopy. We show that the structure of these phases is driven by electrostatic interactions between the decavanadate [H2V10O28]4- polyanions initially present in the V2O5 sol and positively-charged collagen helices.
EXPERIMENTAL DETAILS Type I collagen helices were extracted from young rat tail tendon [7], and were stabilized at 20°C in a solution of acetic acid (0.5 mol.L-1) at a concentration of 2.8 mg
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