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Showing 1 to 20 of 111 for “"Polypyrrole"”.
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Chemical sensing using polypyrrole actuators
… their concurrent mechanical flexibility. The ICP polypyrrole can be prepared as an electromechanical actuator, capable of operation under low applied power. Through the application of colorimetric dyes to the polypyrrole actuators simple sensors can be developed with the actuator acting as a …
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Evaluating the biostability of polypyrrole microwires
… polymers, electrodes are fabricated from polypyrrole using a variety of dopants to improve conductivity. These electrodes are then immersed in artificial cerebrospinal fluid while impedance measurements are taken over a period of days. The impedance of the electrodes increases rapidly for …
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Molecular recognition of chlorine-doped polypyrrole
… of scFv libraries the surface of chlorine-doped polypyrrole (PPyCl) has been modified to facilitate binding of neuronal phenotype cells. The selection of peptides using phage display found a surface specific recognition peptide (T59) that was made bivalent by altering the C-terminus with an …
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Characterization of the magnetoresistance of polypyrrole
Conducting polymers such as polypyrrole have been the subject of intensive study due to their light weight and useful electrical properties. Many applications of such polymers, such as for use as motor windings or as magnetic field sensors, require a precise knowledge of the electrical properties …
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Tunable wettability of microstructured polypyrrole films
… the development of the conducting polymer polypyrrole as a viable material for applications requiring switchable wettability. A fabrication procedure that produces robust microstructured polypyrrole (PPy) that quickly and reversibly switches between the superhydrophobic and superhydrophilic …
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Raman studies of thin polypyrrole films
Polypyrrole is an electrochemically synthesized conductive polymer that has physical properties which impede efforts to develop structure-properties relationships. The extent of conjugation, as limited by the presence of structural disorders in the polymer, is important in determining its inherent …
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A Characterization of Caffeine Imprinted Polypyrrole Electrode
… Conductive polymers, (CPs) such as polypyrrole, can be likened to semiconductors because of small band gaps and low electronic mobility. CPs are exploited as an excellent tool for the preparation of nanocomposites with nano scaled biomolecules. Polypyrrole (Ppy) was the first of this …
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Polypyrrole : an interactive substrate for bone regeneration
… of using an electrically conducting polymer, polypyrrole, as a substrate for bone regeneration. Optically transparent thin films of polypyrrole, with a polyanionic dopant, poly(styrenesulfonate), were synthesized electrochemically and characterized by X-Ray Photoelectron Spectroscopy, UV/VIS …
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Polypyrrole-containing Composite Particles: Preparation, Characterization and Application
This research is focused on preparation of polypyrrole (PPy) composite particles by using socalled template oxidative polymerization method. As a template, water-soluble polymers, polymeric microgels, latex particles or bulk gels can be used. The morphology and properties of the composite particles …
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Design, fabrication and characterization of polypyrrole trilayer actuators
… by sandwiching the ions between two strips of polypyrrole films can be actuated in air. This thesis compares two methods of constructing polypyrrole trilayers: an electrolyte gel method and a gold coated PVDF membrane method. It will discuss the construction processes as well as properties of …
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Novel polypyrrole derivatives to enhance conductive polymer-tissue interactions
… of interacting in biological environments. Polypyrrole (PPy) is a conducting polymer that is a promising biomaterial for drug delivery and sensing applications. Because PPy is a polymer that can be made in degradable forms and because it can be stimulated electrically, it is an interactive …
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Artificial muscle morphology : structure/property relationships in polypyrrole actuators
We seek to improve polypyrrole and other conducting polymer actuators by discovering and exploiting the connection between nanoscale transport events and macroscale active strain. To this end we have used diffraction and electron microscopy to investigate the microstructure of polypyrrole. and …
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Developing polypyrrole coated coronary stents for extended release of Sirolimus
… in order to improve drug release profiles. Polypyrrole is a biocompatible conducting polymer with distinct chemical/physical properties. Sirolimus is a hydrophobic anti-proliferative drug which retains in the vessel wall to inhibit SMC proliferation. During this investigation polypyrole …
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Modeling, identification, and application of multilayer polypyrrole conducting polymer actuators
… available, self-contained, multilayer polypyrrole (PPy) actuators to develop low-order lumped parameter models of actuator electrical, mechanical, and electromechanical behavior. Experimental data were processed using system identification techniques. Both grey box and black box models …
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Synthesis and Characterisation of N-substituted Pyrrole Monomers and Polypyrrole Films
In this body of work, the polymerisation of N-substituted pyrrole monomers and the functionalisation of the monomers or the resulting polymers, with transition metal complexes, were performed. Polymer deposition was executed, utilising the electrochemical deposition technique, due to its facile use …
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Electrochemical Deposition of Copper and Zinc Nanomaterials at Polypyrrole Thin Films
… nanomaterials was performed on the top of polypyrrole-polystyrene sulfonate (PPy-PSS) thin films from their respective sulfate solutions in presence of dissolved oxygen. Three main processes were responsible for the formation of the nanomaterials, namely, the capture of Cu2+ or Zn2+ ions by …
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Electrochemistry of Polypyrrole and Poly(N-methylpyrrole) and their DNA Composites.
… of novel conducting polymers based on the use of polypyrrole and poly(N-methylpyrrole), and new counter ions, single-stranded and double-stranded DNA. This research has established the polymerization kinetics which now allows the films on the electrode surface to be modified in order to perform …
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Synthesis of electrically conductive polypyrrole thin films via ammonium persulfate chemistry
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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