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Conducting Polymers: Properties and Applications - Jul …

Synthesis and properties of conducting polypyrrole polyalkylanilines ..

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a conducting polymer; its synthesis, properties and ..

Abstract:
The administration of nanoparticles to tumors followed by alternating magnetic field application was shown to efficiently destroy tumors both preclinically and clinically, especially glioma. However, antitumor efficacy remains suboptimal and requires further improvements. We therefore developed a new type of nanoparticles synthesized by magnetotactic bacteria called magnetosomes. Due to their chain arrangement that leads to uniform distribution, ferrimagnetic properties that enhance their heating power and to a controlled release of endotoxins that attract polynuclearneutrophiles, we show that chains of magnetosomes achieve full destruction of intracranial U87-Luc glioma tumors under AMF application in 40% of treated mice using a rather low quantity of magnetosomes administered of 13 µg of magnetosomes per mm3 of tumor. By contrast, under the same treatment conditions, signs of antitumor activity are not observed with chemically synthesized nanoparticles currently used in the magnetic hyperthermia treatment of tumors. It also appears that full glioma destruction is achieved when magnetosomes occupy only 10% of the whole tumor volume, which suggests the involvement of an indirect mechanism of tumor destruction, which is desired for the treatment of infiltrating tumors, such as glioma, for which whole tumor coverage by nanoparticles can hardly be achieved.

Parameters on the Synthesis and Properties of Polypyrrole Coatings on Steel ..

Abstract:
Inorganic semiconductors have recently drawn a huge attention due to their low cost of synthesis and multifunctional applications. Since nickel and titanium oxides have shown to exhibit unique properties separately, nickel titanate was synthesized demonstrating synergistic behavior. Afterwards, it was linked with the reduced graphene oxide, which displays large surface area, high electrical conduction, good electron transport rates and improves dispersity of the inorganic semiconductors. The proposed composite material was utilized for the construction of the glucose sensitive electrochemical sensor of the increased electrocatalytic performance. Applicability of the designed biosensor was shown towards glucose determination in human body fluids.

Polypyrrole: a conducting polymer; its synthesis ..

Abstract:
This work focuses on the synthesis and the modification of mesoporous silica SBA-15 using in-situ polymerization of polypyrrole. In order to study the effect of polypyrrole contents on the structural, textural and dye adsorption properties, several polypyrrole contents were dispersed and analyzed by various techniques such as X-ray diffraction (XRD), nitrogen sorption at 77 K, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and scanning electronic microscopy (SEM). The obtained materials were tested for the removal of cationic and anionic dyes. The effect of pH, contact time, adsorbent dose, and initial dye concentration were investigated and discussed in terms of adsorption efficiency. The obtained results show that the adsorption efficiency of MO dye is preferably carried out by the nanocomposites PPY/SBA-15(50%) containing higher polypyrrole content. Whereas, the adsorption of MB is oriented by the parent material SBA-15 and the nanocomposite PPY/SBA-15(1%) containing lower content of polypyrrole. The experimental data were verified by the Langmuir and Freundlich isotherms, and the kinetic data were fitted by pseudo-first-order and pseudo-second-order models. The obtained results showed that the adsorption of the both dye by nanocomposite PPY/SBA-15 followed Langmuir adsorption isotherm models and pseudo-second-order kinetics. The adsorbed amounts recorded for MO and MB dyes are 41.66 mg/g and 58.82 mg/g, respectively.

Biography:
Sam Rudd is a last-year PhD student in the Future Industries Institute – Energy and Advanced Manufacturing – at the University of South Australia. He has 10 years of experience in both research and industry. The current focus of his research is in the interrelation between the chemistry and physics of Conductive Polymers, and how they manifest in performance and properties of these novel materials. As the outcome of his research, in collaboration with a world-leading company (Sentek Pty Ltd), his name is listed as co-inventor of a new generation of agricultural sensor, as a world first application using a conductive polymer.

(synthesis, properties, applications) ..

Biography:
Mrs Shaista Taimur is a PhD scholar from Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan. Her PhD degree is in Materials Engineering (2017). She is scientifically skilled in polymeric nanohybrid composites synthesis and processing. Her reserach area and expertise are clay polymer nanocomposites (CPNs) synthesis and processing with special focus on chemical and radiation grafting, Organic-inorganic nanohybrids and their applications in toxic and precious metals removal and recovery and modification of nanoclay (sepiolite) for tailor made properties and applications. She has three international publications. She has teaching experience in different institutions of Pakistan.

Biography:
Mrs Shaista Taimur is a PhD scholar from Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan. Her PhD degree is in Materials Engineering (2017). She is scientifically skilled in polymeric nanohybrid composites synthesis and processing. Her reserach area and expertise are clay polymer nanocomposites (CPNs) synthesis and processing with special focus on chemical and radiation grafting, Organic-inorganic nanohybrids and their applications in toxic and precious metals removal and recovery and modification of nanoclay (sepiolite) for tailor made properties and applications. She has three international publications. She has teaching experience in different institutions of Pakistan.

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  • the physical properties of polypyrrole ..

    Core level photoemission studies on conducting polypyrrole polymer nanotubes showing switching ..

  • interacting each particle of polypyrrole conducting polymer.

    06/12/2011 · International Scholarly Research Notices is a ..

  • International Journal « Nanoelectronics lab

    Polypyrrole - Wikipedia

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SKKU - Nano Materials and Nano Devices Lab

Pierre M. Beaujuge is a Ph.D. candidate working with Prof. John R. Reynolds at the University of Florida in Gainesville. A native of France, he began his graduate studies at the Graduate School of Chemistry and Physics of Bordeaux (ENSCPB) in France in 2002. As part of his graduate program, he joined in 2004 the research laboratories of Arkema, Inc. in King of Prussia, PA, where he worked under the supervision of Dr. Gary S. Silverman and Dr. Roman Y. Korotkov. In 2005, Pierre moved to the University of Florida (UF). In 2006, while at UF, he received his Diplôme d’Ingénieur from the Graduate School of Chemistry and Physics of Bordeaux. His doctoral research is currently directed toward developing novel π-conjugated semiconducting polymers with tunable optical and charge transport properties for optoelectronic applications. He is involved in device fabrication aspects via collaboration with Prof. Franky So at the Materials Science and Engineering department of UF.

Polymers are large molecules composed of repeated chemical units

In general, template synthesis has offered chemists a more flexible and efficient route to synthesize well-defined conducting polymer nanostructures. Meanwhile, the nanostructure synthesized by template synthesis shows some improved physical properties that show great potential for its application in energy storage devices, for example, conductivity at room temperature. Martin and his group found that template-synthesized conducting polymer tubes or fibrils have enhanced conductivity as compared with bulk materials. The nanotubes have enhanced conductivity because the conductive polymer as synthesized has high molecular and supermolecular order. The Martin group proposed several mechanisms for the formation of the high ordering of the conductive polymer: 1) the chain of conductive polymer deposited in the nanochannels oriented according to the ordering of the polycarbonates molecules in membrane wall; 2) the polycationic conductive polymer preferentially polymerizes on the anionic sites on the pores of polycarbonates membrane; 3) the chain ordering of conductive polymer is induced by the confined synthesis into nanopores acting as nanoreactor [–]. Meanwhile, it was found that the conductivity is enhanced with decreasing pore diameter [,–]. A dramatic change in conduction behavior from an insulating regime to a metallic regime through the critical regime as diameter decreases.

The smallest repeating unit is called a mer

Microemulsion (oil-in-water) polymerization produces conducting polymer nanoparticles with good control over the size of nanoparticles. The structure and concentration of surfactants and monomers are critical factors for controlling the morphological parameters of products. Jang et al. synthesized polypyrrole with a monodispersed size in a microemulsion with alkyl-trimethylammonium bromide cationic surfactants []. The size of the polypyrrole nanoparticles could be well controlled to be less than 5 nm. They found that the surfactants most suitable for microemulsion polymerization should have alkyl lengths between C6 to C16 because alkyl chains shorter than C6 have weak hydrophobic interactions, while alkyl chains longer than C16 have too high a viscosity to form self-assembled nanostructures. Monodispersed polypyrrole nanospheres were synthesized at reagent concentrations between critical the micelle concentration (CMC) I and II. Guo et al. used sodium dodecyl sulfate (SDS, an anionic surfactant) and HCl solution to control the morphology of polyaniline [–]. They found that the pH value of the solution dramatically influenced the self-assembly morphology of the products. Polyaniline in the forms of granules, nanofibers, nanosheets, rectangular submicrotubes, and fanlike/flowerlike aggregates were obtained by using different SDS and HCl concentrations.

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