Results 201 to 210 of about 13,508 (243)

Actuation of polypyrrole nanowires

Nanotechnology, 2008
Nanoscale actuators are essential components of the NEMS (nanoelectromechanical systems) and nanorobots of the future, and are expected to become a major area of development within nanotechnology. This paper demonstrates for the first time that individual polypyrrole (PPy) nanowires with diameters under 100 nm exhibit actuation behavior, and therefore ...
Alexander S, Lee, Serban F, Peteu, James V, Ly, Aristides A G, Requicha, Mark E, Thompson, Chongwu, Zhou   +5 more
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Electromagnetic shielding of polypyrrole–sawdust composites: polypyrrole globules and nanotubes

Cellulose, 2017
Economic and efficient materials for the shielding of electromagnetic interference are required by many applications. Electrically conducting composite materials based on wood sawdust modified by polypyrrole (PPy) with different morphology, globular and nanotubular, were prepared through in-situ polymerization of pyrrole with the use of iron (III ...
Vladimir Babayan, Natalia E. Kazantseva, Robert Moučka, Jaroslav Stejskal   +3 more
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Polypyrrole–oxalate and polypyrrole–sulfate electrodes for supercapacitor applications

Chemical Papers
Polypyrrole-oxalate (PPy-O) electrodes were electropolymerized from the oxalate solutions containing oxalic acid and pyrrole (Py) monomer. The structural, electrochemical and capacitive behaviors were studied depending on the monomer concentration, the applied current density and the film thickness.
Murside Haciismailoglu, Dilek Vatansever, Mursel Alper   +2 more
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Conductivity enhancement in raw polypyrrole and polypyrrole nanoparticle dispersions

Polymers for Advanced Technologies, 2006
AbstractFor certain commercial applications of polypyrrole (PPy), an enhancement of the electrical conductivity of the material is the key to industrial success. In this paper it will be shown that raw PPy with high conductivity (>150 S/cm) can be obtained in very good yield (>90%) by appropriate selection of both bi‐functional additives and ...
José‐Adolfo Pomposo, Estibalitz Ochoteco, Cristina Pozo, Pedro‐Maria Carrasco, Hans‐Jürgen Grande, Francisco‐Javier Rodríguez   +5 more
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Synthesis and Characterization of Polypyrrole and Graphene/Polypyrrole/Epoxy Composites

Arabian Journal for Science and Engineering, 2016
Conducting polypyrrole (PPy) nanoparticles were synthesized via four different radical polymerization systems changing the time and other parameters. The characterization of PPy nanoparticles was done by Fourier transform infrared spectrometer. Graphene was synthesized from intercalated graphite by exfoliation at 1000\({^{\circ}}\) C for 30 s in tube ...
Sumaira Nosheen, Mohsin Ali Raza, Shahzad Alam, Muhammad Irfan, Asma Iftikhar, Farooq Iftikhar, Bilal Waseem, Zaheer Abbas, Badarudin Soomro   +8 more
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Impedance of polypyrrole perchlorate/polypyrrole poly(styrenesulfonate) bilayers

The Journal of Physical Chemistry, 1993
The impedance of polypyrrole perchlorate/polypyrrole poly(styrenesulfonate) bilayers on Pt electrodes as a function of the electrode potential and the relative thickness of the two layers demonstrates conclusively that the redox reaction begins in the outer layer, at the polymer/solution interface.
Xiaoming Ren, Peter G. Pickup
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Characterization of Polypyrrole

Molecular Crystals and Liquid Crystals, 1985
Abstract The renewed interest in the conducting polymer polypyrrole in 1968 was due to the efficient electrochemical synthesis of the polymer which made it possible to grow thin films with appropriate mechanical properties to facilitate the characterization of the polymer.
A. I. Nazzal, G. B. Street, K. J. Wynne
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Bioerodible Polypyrrole

MRS Proceedings, 2001
ABSTRACTConductive polymers such as polypyrrole (Ppy) are potentially useful as an active interface for altering cellular processes and function. Their utilization in medically related applications however have been substantially held back by their non-degradable nature.
Alexander Zelikin, Venkatram Shastri, David Lynn, Jian Farhadi, Ivan Martin, Robert Langer   +5 more
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Synthesis and characterization of soluble polypyrrole and polypyrrole/organoclay nanocomposites

Journal of Materials Science Letters, 2003
As one of the novel conducting polymers, polypyrrole (PPY) has been widely studied due to its good thermal and environmental stability as well as its superior electric conductivity [1, 2], and electrorheological applications [3]. However, PPY is generally insoluble in typical organic solvents because of its strong interand intra-molecular interactions ...
D. P. Park, J. H. Sung, S. T. Lim, H. J. Choi, M. S. Jhon   +4 more
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Polypyrrole

Abstract This chapter presents the history of polypyrrole over the period of 1915–1983. As this material is dependent on the availability of pyrrole, the chapter begins with an overview of the discovery and synthesis of this heterocycle before introducing its initial oxidative polymerization by Angeli in 1915.
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