Organic / Inorganic Hybrid Material for Coating on Metals
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Organic / Inorganic Hybrid Material for Coating on Metals Zhexiong Tang, Neil Alvarez and Sze Yang Department of Chemistry, University of Rhode Island, Kingston, RI 02879 ABSTRACT In this paper, we present the syntheses of nano particles of organic / inorganic hybrid for coating on metal or glass surfaces. The organic component is a π-conjugated polymer, polyaniline. The inorganic component is a metal oxide, e.g., cerium oxide. Since the organic component is a water-dispersible polymeric complex of polyaniline and poly(acrylic acid), the hybrid particles are also dispersed in water. The synthesis of the organic / inorganic composite is described. The water dispersible hybrid material was coated on aluminum and glass substrates using a molecular layer-by-layer coating process. INTRODUCTION Nanometer scale organic / inorganic hybrid materials is currently an area of active research. [1] The nano hybrid between organic and transition metal or rare earth oxides are promising materials for photocatalysis, photovoltaics [2,3], and corrosion inhibitors. The nano composites of organic conducting polymer / metal oxide are relatively unexplored. The possible synergism between the organic and inorganic components motivates us to explore the synthesis of this type of hybrid material. In this paper, we explore the synthesis of the hybrid material with the waterdispersible polyaniline [4] as the organic component and the nano crystals of cerium oxide as the inorganic component. The commercially available nano cerium oxide [5] has a diameter between 15 to 20 nm. The water dispersible polyaniline particles synthesized for this work has a diameter of 100 to 200 nm. We report the synthesis of hybrid nano particles. Since the organic / inorganic hybrid particles are dispersible in water, they are suitable for coating on glass or metal substrates. Cerium oxide and polyaniline have been studied for its electroactive interaction with metal surfaces for protecting the lightweight high-strength aluminum alloys from corrosion. [6,7,8] The research in this area has been motivated by the need for a new corrosion inhibitor that may replace the toxic chromates currently in use. Since the inorganic oxide and the conducting polymer protect the metal surface by different mechanisms [9], there is a possibility for the hybrid material to be a more effective corrosion inhibitor due to the synergistic interaction provided by the hybrid. EXPERIMENTAL Materials Nano particles of cerium oxide were purchased from Nanophase Technologies, Romeoville, IL. The particles have an average diameter of 20 nm. Poly(acrylic acid) was purchased from two suppliers, Aldrich Chemicals and Polysciences. Polyacrylic
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acid 25% solution in water, molecular weight 90,000 (viscosity average molecular weight, polydispersity unknown) was obtained from Polysciences. Poly(acrylic acid) 35% solution in water with molecular weight of 250,000 (viscosity average, polydispersity unknown) was obtained from Aldrich Chemicals. Aniline from Aldrich was purified by disti
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