Electrospun Nanofibers Of Conjugated Polymers PDF Download
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Author | : A. Sezai Sarac |
Publisher | : CRC Press |
Total Pages | : 297 |
Release | : 2017-03-27 |
Genre | : Science |
ISBN | : 9814613525 |
Download Nanofibers of Conjugated Polymers Book in PDF, ePub and Kindle
Conjugated polymer composites with high dielectric constants are being developed by the electronics industry in response to the need for power-grounded decoupling to secure the integrity of high-speed signals and to reduce electromagnetic interference. Electrically conducting polymers are materials that simultaneously possess the physical and chemical properties of organic polymers and the electronic characteristics of metals. Multifunctional micro- and nanostructures of conjugated polymers, such as of pyrrole, have received great attention in recent years because they can polymerize easily and have high conductivity and good thermal stability. They, however, have some disadvantages such as brittleness and hard processability, which can be overcome by developing their nanocomposites. Nanofiber materials with different dielectric properties can be made from conjugated polymer composites and used in the electronics industry, in sensors and batteries, for electrical stimulation to enhance nerve-regeneration process, and for constructing scaffolds for nerve tissue engineering. Electrospinning is a versatile technique that is used to produce ultrathin continuous fibers with high surface-to-volume and aspect ratios from a variety of materials, including polymers, composites, and ceramics. Conductive materials in fibrillar shape may be advantageous compared with films because of their inherent properties such as anisotropy, high surface area, and mechanical strength. They are of particular interest in electroactive composites as they can be efficiently distributed in an insulating polymer matrix to improve both electrical and mechanical properties. Combination of electrical properties with good mechanical performance is of particular interest in electroactive polymer technology. This book covers the general aspects of electrospinning and discusses the fundamental concepts that can be used to produce nanofibers with the help of mathematical models and equations. It also details the methods through which different polymeric structures can be included in conjugated polymers during electrospinning to form composites or blends of conjugated polymer nanofibers.
Author | : Amit Babel |
Publisher | : |
Total Pages | : |
Release | : 2005 |
Genre | : Chemical engineering |
ISBN | : |
Download Electrospun Nanofibers of Conjugated Polymers Book in PDF, ePub and Kindle
Author | : Dario Pisignano |
Publisher | : Royal Society of Chemistry |
Total Pages | : 442 |
Release | : 2013 |
Genre | : Crafts & Hobbies |
ISBN | : 1849735743 |
Download Polymer Nanofibers Book in PDF, ePub and Kindle
Research into polymer nanofibers has increased significantly over the last decade, prompting the need for a comprehensive monograph examining the subject as knowledge of their properties and potential applications has increased. Postgraduate students and researchers new to the field will benefit from the "from materials to applications" approach to the book, which examines the physio-chemical properties in detail, demonstrating how they can be exploited for a diverse range of applications, including the production of light and wound dressings. Techniques for the fabrication, notably electrospinning, are discussed at length. This book provides a unique and accessible source of information, summarising the last decade of the field and presenting an entry point for those entering the field and an inspiration to established workers. The author is currently the national coordinator for several research projects examining the applications of polymer nanofibers, alongside active international collaborations.
Author | : A. Sezai Sarac |
Publisher | : CRC Press |
Total Pages | : 211 |
Release | : 2017-03-27 |
Genre | : Science |
ISBN | : 131534128X |
Download Nanofibers of Conjugated Polymers Book in PDF, ePub and Kindle
Conjugated polymer composites with high dielectric constants are being developed by the electronics industry in response to the need for power-grounded decoupling to secure the integrity of high-speed signals and to reduce electromagnetic interference. Electrically conducting polymers are materials that simultaneously possess the physical and chemical properties of organic polymers and the electronic characteristics of metals. Multifunctional micro- and nanostructures of conjugated polymers, such as of pyrrole, have received great attention in recent years because they can polymerize easily and have high conductivity and good thermal stability. They, however, have some disadvantages such as brittleness and hard processability, which can be overcome by developing their nanocomposites. Nanofiber materials with different dielectric properties can be made from conjugated polymer composites and used in the electronics industry, in sensors and batteries, for electrical stimulation to enhance nerve-regeneration process, and for constructing scaffolds for nerve tissue engineering. Electrospinning is a versatile technique that is used to produce ultrathin continuous fibers with high surface-to-volume and aspect ratios from a variety of materials, including polymers, composites, and ceramics. Conductive materials in fibrillar shape may be advantageous compared with films because of their inherent properties such as anisotropy, high surface area, and mechanical strength. They are of particular interest in electroactive composites as they can be efficiently distributed in an insulating polymer matrix to improve both electrical and mechanical properties. Combination of electrical properties with good mechanical performance is of particular interest in electroactive polymer technology. This book covers the general aspects of electrospinning and discusses the fundamental concepts that can be used to produce nanofibers with the help of mathematical models and equations. It also details the methods through which different polymeric structures can be included in conjugated polymers during electrospinning to form composites or blends of conjugated polymer nanofibers.
Author | : Kezhen Yin |
Publisher | : |
Total Pages | : 154 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Preparation and Optical Properties of Electrospun Conjugated Polymer/polyethylene Oxide Nanofibers and Conjugated Polymer/nanoparticle Composites Book in PDF, ePub and Kindle
Conjugated polymer nanocomposites with unique optical and electronic properties have attracted great interest in both fundamental science and potential optoelectronic applications. This thesis includes three projects on preparation and optical studies of nanocomposites containing conjugated polymers. The first project focuses on the photoluminescence properties of conjugated polymers poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) and poly(3-hexylthiophene) (P3HT) in dilute solutions, and in the composites of MEH-PPV/polyethylene oxide (PEO) and P3HT/PEO with thin films, random electrospun nanofibers and aligned electrospun nanofibers morphologies. In dilute solutions, the conjugated polymer chain aggregated with addition of poor solvent. In the solid states, polarized luminescence spectra of this films prepared by spin-coating, random and aligned nanofibers prepared by electrospinning were measured. The emission anisotrphies of aligned nanofibers were above 0.5 and increased with drcreasing concentration of conjugated polymer in nanofibers, whereas the emission anisotropies of random fibers and thin films were below 0.2. The results indicated that the alignmed electrospun nanofibers would have the macromolecular chains oriented preferably along the nanofiber axes, which led to strong polarized emission. In the second project, effects of surface modification on the fouorescence properties were conjugated polymer/zinc oxide nanocomposites were studied. The ZnO nanoparticles with surface capped by PVP were better dispersed in the nanocomposites and were more efficient to quench the emission of MEH-PPV by charge transfer process, compared with the non-capped ZnO. In the third project, the stable Pd/poly(3,4-ethylenedioxythioprene): poly(styrenesulfonate) (Pd/PEDOT:PSS) colloid was synthesized. With addition of PSS, the Pd/PEDOT:PSS aqueous dispersion was formed by simultaneous oxidation-reduction reaction between Pd(NO3)2 and ethylenedioxypthiphene(EDOT) at room temperature. The Pd/PEDOT:PSS thin film was tested as the Pd?PEDOT:PSS this fild was testes a NHE3 sensor.
Author | : 曾平 |
Publisher | : |
Total Pages | : 94 |
Release | : 2009 |
Genre | : |
ISBN | : |
Download Morphology and Optoelectronic Properties of Electrospun Nanofibers Prepared from Conjugated Polymer Blends Book in PDF, ePub and Kindle
Author | : 王正廷 |
Publisher | : |
Total Pages | : 79 |
Release | : 2008 |
Genre | : |
ISBN | : |
Download Morphology and Photophysical Properties of Electrospun Nanofibers Prepared from Conjugated Polymer Blends Book in PDF, ePub and Kindle
Author | : 郭霽慶 |
Publisher | : |
Total Pages | : 193 |
Release | : 2009 |
Genre | : |
ISBN | : |
Download Electrospun Conjugated Polymer Nanofibers Book in PDF, ePub and Kindle
Author | : Jinglin Liu |
Publisher | : |
Total Pages | : 130 |
Release | : 2016 |
Genre | : Conjugated polymers |
ISBN | : 9781369128574 |
Download Structure and Properties of Conjugated Polymer Thin Films and Nanofibers Book in PDF, ePub and Kindle
Conjugated polymers are electronically and ionically active organic materials. These polymers are widely used in biomedical interfaces, chemical sensors and organic photovoltaics for their reasonably high conductivity and relatively “soft” mechanical properties. However, despite the wide applications, the structure-property relationship of these materials remains poorly understood. Here we presented a study on the structural characterization and property analysis of conjugated polymer thin films and nanofibers. ☐ Electrochemical polymerization is a convenient method for fabricating polymer thin films. We reported a novel electrochemical deposition of highly crystalline bromine functionalized thiophene monomer, which is a precursor for solid-state polymerized poly(3,4-ethylene dioxythiophene) (PEDOT). We investigated the electrochemical process in detail by altering conditions and carefully monitoring the reaction. The morphology, structure and properties of both the EDOT-Br monomer and PEDOT polymer were characterized. ☐ Despite the wide application of electrochemical polymerization, a detailed, quantitative understanding of nucleation and growth mechanisms has remained elusive. We have studied the electrochemical deposition of PEDOT from an aqueous solution of EDOT monomer using an in-situ Transmission Electron Microscopy (TEM) liquid flow cell. It was found that PEDOT deposition began preferentially at the edge of the glassy carbon anodes at the beginning of the reaction. Fluctuating clusters of liquid-like oligomers were observed to form near the electrode surfaces. As the reaction continued both the nucleation of new domains as well as the growth of pre-existing PEDOT deposits were observed, leading to systematic increases in film thickness and roughness. ☐ Conjugated polymer nanofibers are of particular interest for their high surface-to-volume ratios, and have been considered for applications such as field-effect transistors, biomedical devices and sensors. Electrospinning is a well-developed method for the solution processing of polymers into nanometer to micrometer-sized fibers. We quantitatively studied the relationship between molecular orientation and fiber diameter within single electrospun fibers using low dose electron microscopy and diffraction techniques. It was confirmed that for electrospun fibers with decreasing fiber diameters, the molecular orientation increased. To facilitate the solution processing of the otherwise dilute and low viscosity conducting polymers, another relatively easy-to-process supporting polymer was introduced into the fabrication. Poly(3-hexylthiophene-2,5-diyl) (P3HT) + polycaprolactone (PCL) core-shell nanofibers were prepared via a coaxial electrospinning method. Morphological results from electron microscopy confirmed that P3HT conjugated polymer nanofibers were obtained after solvent removal of the PCL supporting polymer. Molecular orientation studies revealed that polymer chains were oriented parallel to fiber axes in the PCL polymer shell, while perpendicular to fiber axes in the P3HT core. The electrical and mechanical properties of the core-shell polymer nanofibers were investigated at the single fiber level using a specialized stage in the chamber of a Focused Ion Beam – Scanning Electron Microscope (FIB-SEM).
Author | : Mehdi Afshari |
Publisher | : Woodhead Publishing |
Total Pages | : 650 |
Release | : 2016-09-13 |
Genre | : Technology & Engineering |
ISBN | : 0081009119 |
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Electrospun Nanofibers covers advances in the electrospinning process including characterization, testing and modeling of electrospun nanofibers, and electrospinning for particular fiber types and applications. Electrospun Nanofibers offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science. Electrospinning is the most commercially successful process for the production of nanofibers and rising demand is driving research and development in this field. Rapid progress is being made both in terms of the electrospinning process and in the production of nanofibers with superior chemical and physical properties. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types such as bicomponent and composite fibers, patterned and 3D nanofibers, carbon nanofibers and nanotubes, and nanofibers derived from chitosan. Provides systematic and comprehensive coverage of the manufacture, properties, and applications of nanofibers Covers recent developments in nanofibers materials including electrospinning of bicomponent, chitosan, carbon, and conductive fibers Brings together expertise from academia and industry to provide comprehensive, up-to-date information on nanofiber research and development Offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science