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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 123 for “"conducting polymer"”.
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Conducting polymer actuators
Conducting polymers are unusual organic materials featuring high electronic conductivity. Recently it has been observed that some of these polymers change in dimension when their oxidation state is altered. Dimensional changes induced by electrochemical activation in the conducting polymer …
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Conducting polymer actuators : temperature effects
In order to utilize conducting polymer actuators as a viable engineering solution, it is necessary to produce usable levels of force with a reasonable bandwidth. Polypyrrole actuated at temperatures as high as 100 °C increases stress magnitudes by as much as 4x and stress rates by 5x. The effect is …
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Continuous production of conducting polymer
… manufactured, and tested. Polypyrrole is a conducting polymer which has potential artificial muscle applications. The objective of continuous production was to produce both larger films and films with more consistent properties than the films produced by the current batch-production method. …
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Electrodeposition of conducting polymer fibers
Conducting polymers are materials that possess the electrical conductivity of metals while still retaining the mechanical properties such as flexibility of traditional polymers. Polypyrrole (PPy) is one of the more commonly studied electrically conducting polymers due to its high conductivity and …
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Large contraction conducting polymer molecular actuators
… by even the most complex robotic system to date. Conducting polymers were chosen for research as actuators, based on a review of the relevant properties of all known actuators and active materials. Key features of conducting polymer actuators include low drive voltages (1 - 2 V) and high active …
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Conducting polymer actuator enhancement through microstructuring
Electroactive conducting polymers, such as polypyrrole, polyaniline, and polythiophenes are currently studied as novel biologically inspired actuators. The actuation mechanisms in these materials are based on the diffusion of ions in and out of the polymer film. Giving ions more access to the …
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Cortical recording with conducting polymer electrodes
… mismatch. This thesis shows the fabrication of conducting polymer electrodes and the stability of their impedance in physiological saline. The initial impedance was as low as 70 k[omega], but the electrode impedance increased by a factor of 10 when immersed in saline over 370 hours. This …
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Large displacement fast conducting polymer actuators
Conducting polymers are a promising class of electroactive materials that undergo volumetric changes under applied potentials, which make them particularly useful for many actuation applications. Polypyrrole , is one of the most common conducting polymers of choice for the development of actuator …
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Development and modeling of conducting polymer actuators and the fabrication of a conducting polymer based feedback loop
Conducting polymers as a class of materials can be used to build a diverse range of devices. Conducting polymer based actuators (muscles), transistors (neurons), strain gages (muscle spindles), force sensors (Golgi tendon organs), light emitting diodes, photodetectors (eyes), batteries and …
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Synthesis and characterization of conducting polymer actuators
Conducting polymers are known to mechanically respond to electrochemical stimuli and have been utilized as linear actuators. To date, the most successful mechanism for actuation is ionic ingress and egress, though mechanisms based on conformational changes and molecular interactions have also been …
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Conducting polymer wires for intravascular neural recording
… metal wires are too stiff for this application. Conducting polymer nanowires could be used in place of metal to build electrodes with far lower stiffness and high conductivity. This thesis describes several all-polymer electrode architectures and the fabrication techniques used to build them. …
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Development and characterization of conducting polymer actuators
Conducting polymers such as polypyrrole, polythiophene and polyaniline are currently studied as novel biologically inspired actuators. The actuation mechanism of these materials depends upon the motion of ions in and out of the polymer film during electrochemical cycling. The diffusion of ions into …
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Fabrication and characterization of conducting polymer microwires
Flexible microwires fabricated from conducting polymers have a wide range of potential applications, including smart textiles that incorporate sensing, actuation, and data processing. The development of garments that integrate these functionalities over wide areas (i.e. the human body) requires the …
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Odour evaluation using arrays of conducting polymer sensors.
… device comprising an array of polypyrrole-based conducting polymer gas sensors was employed. Some response data has been analysed using euclidean clustering techniques to determine the individuality of sensor responses. Groups of sensors, very often pairs or threes in an array have responded in a …
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Fabrication and use of conducting polymer linear actuators
… mechanical flexibility, and compact size. Conducting polymers, such as polypyrrole, exhibit muscle-like properties and the potential to provide the above capabilities while delivering significant forces over useful displacements. Current conducting polymer linear actuators, however, are …
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Preparation and Application of Conducting Polymer-Carbon Nanotube Composite.
… carbon nanotubes (CNTs) and polypyrrole (PPy) conducting polymers (CPs) as models to make a nanotube and conducting polymer composite material. Under electro-oxidation condition, the PPy/CNT films can be grown on conventional substrates such as a glassy carbon electrode in aqueous and …
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Conducting Polymer Implant for On-demand Ocular Drug Delivery
… release of the active. They may be composed of conducting polymers (CP) such as poly(3,4-ethylenedioxythiophene) (PEDOT), a robust CP with good biocompatibility and reproducible electroactivity. This thesis investigated the fabrication of a PEDOT-based system suitable for implantation to provide …
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Scanning electrochemical microscopy with conducting polymer probes: Validation and applications
… on active materials. Here we explore how conducting polymers (CPs) offer several advantages as probe electrode material, given its versatility in the measurement of redox and ionic processes, resulting in a probe that can simultaneously respond to these two aspects. Our CP probes can be …
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