Electrical Percolation in Polymer Nanocomposites of Nickel and Iron Nanostrands
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Percolation (cognitive psychology)
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In this work, we report the relationship between the electrical conductivity and nanoparticle effective surface area with functional properties of polymer-metal and polymer-clay nanocomposites. Conductivity of the nanocomposite strongly depends upon metal/clay nanoparticle size and concentration that ultimately dictate where the system percolates. Knowledge of percolation properties allows the design of functional nanocomposites for biomedical and sensors applications. Herein we report the successful production of three functional chitosan-metal/clay nanocomposites: a) chitosan-Ag films with antibacterial properties, b) chitosan-Au potentiometric sensor for detection of Cu ++ and c) chitosan-nanoclay potentiometric sensor for detection of NO3-. For all these applications the best functional performance of nanocomposites has been observed when NPs concentration increases and approaches the percolation threshold. The obtained relationship between electrical percolation threshold and functional properties of polymer nanocomposites is of primary importance in the design of high-performance applications.
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Metallic nanoparticles and its composites have emerged as valuable asset in all phases of material science and engineering including electronic, optics and electromagnetic domains. Silver nanoparticles (Ag NPs) are one of the most vital and fascinating nanomaterials among several metallic nanoparticles due to its large surface ratio and outstanding properties with diverse field of potential applications. We demonstrated various synthesis techniques of nanocomposites, silver nanoparticles and composite based on these particles have shown great importance because of the remarkable properties (high electrical and thermal conductivity, good chemical stability and catalytic properties) of silver nanoparticles. This chapter provides various synthesis techniques for preparation of silver nanoparticles and their composites with dielectric and electrical properties in a lucid manner. The detail discussions of silver-polymer nanocomposites, emphasizing on each individual synthesis routes and properties have been carried out.
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Nanocomposite particles (NCP) structure of "core-shell" composition Ni @ C were obtained by the method of pyrolytic polymer-salt systems on the basis of phenol-formaldehyde and nickel acetate. It has been shown that nanoparticles (NPs) Ni is a single-domain, the magnetization curve is shaped NCP characteristic superparamagnets and its settlements within the framework of the theory of Langevin paramagnetism in satisfactory agreement with the experimental results. It found a method based on magnetic granulometry model "core-shell" that lognormal distributed Ni NP size and have an average diameter (5 - 8) nm. It was calculated the value of the low surface Ni layer thickness with non-collinear with respect to volume, the magnetic moments. Еnsembles surface depending on the specific saturation magnetization was found and the specific area NCP of the average thickness of the carbon shell.
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This paper describes the methodology of preparing nanocomposites using nickel oxide (Toxic) Nanoparticles in determined amounts in polyester resin and studying their properties for Dynamic Mechanical Analysis. The study provides major importance of the composites with weight loss, storage modulus and Tan delta results. These results provide major insight to the material behaviour in elevated temperatures and how the composites behave. The Nanoparticles filler and matrix bonding acts as major influencing parameter for the material performance. The graphs show uniform distribution of particles in matrix.The material has a significant percentage of combination that attributes to the best combination.The SEM and EDAX readings are also performed and results are discussed.
Nickel oxide
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