An optimized synthetic route for the preparation of water-soluble nanomagnetic conducting polyaniline with high processa

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M11.24.1

An optimized synthetic route for the preparation of water-soluble nanomagnetic conducting polyaniline with high processability Sarswati Koul and Arokia Nathan Electrical and Computer Engineering University of Waterloo, Waterloo, Ontario N2L 3G1, Canada ABSTRACT The synthesis of water soluble nanomagnetic conducting polyaniline with an average particle size of 8nm ±1nm is presented. The particle growth morphology during reaction kinetics was controlled by using polyelectrolyte mediated dual oxidant-dopant system. The synthesis was carried out in a single reactor and the entire synthetic approach follows the principles of green chemistry. Dual oxidant-dopant system offers a solvent less chemical route for the synthesis of nanomagnetic polyaniline with maximum yield production. INTRODUCTION Nanomaterials are particles whose dimensions follow the nanoscale and which exhibit size dependent optical, magnetic, electronic and catalytic properties have been heralded as the next generation of advanced materials. The chemical interaction between atoms in condensed matter produces physical properties that are characterized as specific properties for bulk material. The important controlling factor for nanomaterials lies in the specific synthetic approach that defines the geometrical and dynamical growth through controlled kinetics. Nanomaterials are typically prepared using different routes depending on the application [1-4]. Besides being extensively studied, controlled dimensional growth of nanomaterials is still critical and is a primary concern in synthetic chemistry. One of the main issues in the synthesis of nano-materials based on conducting polymers lies in control of the chemical functionality and processability. The kinetic defects arising from the physical destabilization of reactants and catalysts during polymerization lead to secondary structures, resulting in heterogeneity of the system. Tailoring the ratio of the concentration of reactants to oxidant provides an easy way of controlling the particle size because a high stabilizer-to-reagent concentration ratio favors the formation of small nuclei initially, and thus a small nano-crystal size [5]. The controlled growth dynamics can favor a nanosystem, in which magnetic and conducting moieties are distributed homogenously within the polymeric matrix. The present study is an inclusive attempt towards the synthesis of nanomagnetic conducting polyaniline with controlled reaction parameters in the presence of a dual polyelectrolyte based oxidant-dopant system. The dual system acts both as a medium and oxidant for the initiation and completion of the polymerization process. A detailed investigation of the structural and physical properties of the synthesized polymer is also presented.

M11.24.2

EXPERIMENTAL The synthesis of nanomagnetic conducting polymers consists of two steps. The first includes preparation of a dopant system, which will simultaneously act as an oxidizing agent. The dual oxidizing-dopant system was prepared by dissolving 14 gms of ferric chl

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