Synthesis of new hybrid material based on copolymer and Pd-nanoparticles.
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Synthesis of new hybrid material based on copolymer and Pd-nanoparticles. M. Ugalde 1,2, E. Chavira2, M. T. Ochoa-Lara1, M. A. Canseco2, E.A. Zaragoza-Contreras1, C. Quintanar3, M. Gutiérrez-Nava4. 1
Laboratorio Nacional de Nanotecnología, Centro de Investigación en Materiales Avanzados, S.C., Ave. Miguel de Cervantes #120, C.P. 31109, Chihuahua, Chih., MÉXICO. 2 Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. P. 70-360, 04510 México, D. F., MÉXICO. 3 Facultad de Ciencias, Universidad 3000 Circuito Exterior S/N, C.P. 04510 Ciudad Universitaria, MÉXICO. 4 CIATEQ A.C., Centro de Tecnología Avanzada, , Carretera México Toluca Km. 53.5, en Fraccionamiento Parque Industrial y Tecnológico, Ex Hacienda Doña Rosa, L. 11, Mz. 3, Toluca, Estado de México, MÉXICO C.P. 52000. E-mail: [email protected] ABSTRACT In this work, the synthesis of new hybrid material based on a poly (buthyl acrylate –covinyl formamide) copolymer using the emulsion polymerization and doped with Pd, is discussed. The copolymer structure was confirmed by FT-IR. Afterwards, Pd nanocrystals previously synthesized, resulting on a spherical shape of ~ 5 nm, as measured by Highresolution transmission electron microscopy (HR-TEM), were deposited on the structure of the organic material. The films were analyzed using AFM and Scanning electron microscopy (SEM), giving rise to a hybrid material that could be applied in areas such as nanolithography, catalysis, and sensors.
INTRODUCTION Organic-inorganic composites appear as a creative alternative for obtaining new materials with specific features and properties. This is related to their structure, which leads to multifunctional materials. The design of chemical structures, the interface over control organic-inorganic materials play an important role, since it will determine its potential application in different areas such as catalysis, [1] magnetic, [2] optical [3] and sensors. [4]
EXPERIMENTAL PROCEDURE
Nanoparticles were prepared separately, using an acrylamide sol-gel technique [5]. The palladium was produced according to a previous report. [6] The poly butyl acrylate-co-poly vinylformamide (PABut-co-PVFA) synthesis was carried out by the emulsion copolymerization technique [7]. The chemical reactants used were n-
Butyl acrylate Aldrich, 99%) monomers, vinylformamide (VFA Aldrich, 99%), which were distilled under reduced pressure with sodium lauryl ether sulfate (SLES, Aldrich, 98%) as surfactants and Octylphenol Ethoxylate (Triton X-305) (Dow 70%), potassium persulfate (KPS) the initiator, and distilled water. The reaction was carried out in a 500-ml three-necked flask equipped with a condenser. The Table I summarizes a series of synthesized copolymers with different compositions. The surfactant and the monomers were placed in the flask under stirring in an argon atmosphere at 80ºC. Then, the potassium persulfate (KPS) was added into the reactor. The reaction took place for 5 h.
Copolymer proportion 70-30 50-50 90-10
Table I. Synthesized copolymer comp
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