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Preparation of Conductive and Semi-Conductive Nanocomposites based on Biocompatible Polymers and Investigation of their Conductive, Mechanical and Electrochemical Properties

Doroudian, Mohadeseh | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49558 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali
  7. Abstract:
  8. In this study, conductive and semi-conductive nanocomposites based on biocompatible and biodegradable polymers were prepared and their applications in different areas were studied. Considering huge environmental contaminants derived from various industries, biodegradable polymers (synthetic or natural) have attracted more attention in industrial and biological applications. Aside from their eco-friendly properties, there are other advantages such as availability, different chemical structures, uniqe physical properties and capability to improve their characteristics.One way to improve the properties of the biocompatible polymers is fabrication of their composites with different materials to access various mechanical, electrical, optical, thermal and chemical properties and support their reliable applications in desiered field. In this project, conductive and semi-conductive composites based on biocompatible polymers such as poly(vinyl alcohol) or natural polymers such as polysaccharides were prepared and their properties and applications were investigated. These conductive and semi-conductive composites were prepared using conductive fillers, which are listed in three categories: conductive polymers, carbonic materials and metallic nanoparticles. At the next step, the prepared nanocomposites were used for various applications. Two main applications based on electrical conductivity and biocompatibility were investigated. Based on conductive properties, electromagnetic nanocomposites as heterogeneous support for Au nanoparticles and conductive materials for electrodes of supercapacitores were prepared. The heterogenous catalysts have shown good catalytic activity in reduction of various analytes. The specific capacitance of the prepared electrode of supercapacitores have been achieved 0.2 to 1.42 F/cm2 with high cyclic stability. Based on biocompatibility and conductivity, we fabricated new composites that are usable in biomedical applications such as electro-responsive drug delivery systems and new scaffolds for tissue engineering demands. The new drug delivery systems show fast response to the electrical stimulation and have been applied for anionic, cationic and neutral drug release. The proposed nanocomposites containing GO or Au nanoparticles possess good mechanical and electrical characteristics and their promising application for tissue engineering have been investigated by in vitro cell culture. At each project (8 projects) there are comprehensive study in chemical, physical, mechanical and electrical properties of the nanocomposites as well as their usability in desired applications.
  9. Keywords:
  10. Biocompatible Polymer ; Conductive Polymer ; Conductive Nanocomposite ; Graphene ; Catalyst ; Tissue Engineering ; Gold Nanoparticle ; Drug Delivery ; Supercapacitor Electrode

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