Global ETD Search
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 27 for “"electroactive polymer"”.
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Electroactive polymer actuators: theory and computations
Electroactive polymer actuators are devices composed of polymeric materials which display mechanical actuation under an applied electric field. This mechanical actuation coupled with the relative compliance of polymeric materials renders electroactive polymer actuators an attractive choice for soft …
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Design and testing of fiber-constrained electroactive polymer
… large and heavy. In contrast, electro-active polymers (EAP) such as electrostatically actuated dielectric elastomers (DE) are considered very suitable technologies for these applications. In particular, owing to their simplicity, high strain and energy densities, and low noise, DE’s are …
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Constitutive model of aligned carbon nanotube/nafion nanocomposite ionic electroactive polymer actuators
… including aligned carbon nanotube (A-CNT) polymer nanocomposites (PNC), and with device construction utilizing these novel materials. However, the material constitutive relations of the PNCs and tailoring of these is lagging. In this work, A-CNT and Nafion PNC electrodes are manufactured …
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Electrospun and Vapor-Phase Deposited Electroactive Polymer Nanocomposites for Water Purification via Photocatalysis
… the present work, we electrospun the commodity polymer polyacrylonitrile (PAN) to form the supportive structure of photocatalytic membranes. The role of PAN as carrier polymers or commodity polymer is to provide mechanical strength and robustness as nanocomposite electrospun fibers. Titanium …
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Lab on a chip rare cell isolation platform with dielectrophoretic smart sample focusing, automated whole cell tracking analysis script, and a bioinspired on-chip electroactive polymer micropump
Dielectrophoresis (DEP), an electrokinetic force, is the motion of a polarizable particle in a non-uniform electric field. Contactless DEP (cDEP) is a recently developed cell sorting and isolation technique that uses the DEP force by capacitavely coupling the electrodes across the channel. The cDEP …
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Smart Polymer Electromechanical Actuators for Soft Microrobotic Applications
Ionic electroactive polymer (IEAP) actuators are a class of electroactive polymer devices that exhibit electromechanical coupling through ion transport in the device. They consist of an ionomeric membrane coated with conductive network composites (CNCs) and conductive electrodes on both sides. A …
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Investigation of electroactive ultrathin films by surface plasmon spectroscopy
… high pressure technique to investigate ultrathin electroactive polymer films. Firstly, the electropolymerization of 2, 2a??-bithiophene was investigated by electrochemical surface plasmon spectroscopy. The anion doping and dedoping were monitored during the electropolymerization. A shift of the …
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Exploring and evaluating methods of actuating an active lens
… using an electromagnetic actuator and using an electroactive polymer. From testing each method's abilities, it was found that the electromagnetic actuator, though robust in design poses issues over long-time use. The electromagnetic actuator was able to generate a focal power range of 11.9 to …
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Characterization of macro-length conducting polymers and the development of a conducting polymer rotary motor
Conducting polymers are a subset of materials within the electroactive polymer class that exhibit active mechanical deformations. These deformations induce stresses and strains that allow for conducting polymers to be used as an actuator for mechanical devices. Incorporation of conducting polymer …
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The Application of Thin Film Ionic Self-assembled Multilayer (ISAM) Nanostructures in Electromechanical Bending Actuators and Micro-fabricated Gas Chromatography (uGC) Devices
… technique. Their application in ionic polymer-metal composite (IPMC) electromechanical bending actuators and microfabricated gas chromatography (microGC) devices were investigated and significant performance improvements of these devices were achieved. IPMC bending actuators, consisting …
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Fundamental studies towards the fabrication of electroactive monolithic stationary phases in microfluidic channels
… a monolithic stationary phase which utilises an electroactive polymer combining the advantages of EMLC, monolithic technology and microfluidic separation, thus creating an electroactive monolithic microchip (EMμ). In this thesis, fundamental studies towards the fabrication of EMμ are presented, …
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Electroosmotic Soft Actuators
… to lift large loads (tens of grams). These polymeric electroosmotic actuators are unique among electroactive polymer actuators because they are able to simultaneously generate high force as well as large stroke. It is envisioned that this research will pave the way for the creation of …
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Characterization, Modeling, and Control of the Nonlinear Actuation Response of Ionic Polymer Transducers
Ionic polymer transducers are a class of electroactive polymer materials that exhibit coupling between the electrical, chemical, and mechanical domains. With the ability for use as both sensors and actuators, these compliant, light weight, low voltage materials have the potential to benefit diverse …
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TiO2-doped Ionic Polymer-Metal Composite Actuator
Ionic polymer metal composites (IPMCs) have received substantial attention in the past several years. IPMC actuators are capable of complex deformation in water and air and they are soft actuation materials with promising applications in wide range of fields, such as robotics and medical devices. …
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Synthesis and Characterization of Branched Ionomers for Performance in Ionic Liquid – Swollen Ionic Polymer Transducers
Ionic polymer transducers (IPT) are a class of electroactive polymer devices that exhibit electromechanical coupling through charge transport in ionomeric membranes that contain a charge mobilizing diluent and are interfaced with conducting electrodes. Applications of these active materials have …
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Electromechanical Transduction in Ionic Liquid-Swollen Nafion Membranes
… water has been used as the diluent for ionomeric polymer transducers. The water mobilizes the counterions within the polymer and allows electromechanical transduction to occur. However, these water-swollen devices have limited stability when operated in a non-aqueous environment. In this work, …
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Electromechanical Characterization of the Static and Dynamic Response of Dielectric Elastomer Membranes
Dielectric elastomers (DEs) are a relatively new electroactive polymer (EAP) transducer technology. They are capable of over 100% strain when actuated, and can be used as sensors to measure large strains. In actuation mode, the DE is subject to an electric field; in sensing mode, the capacitance of …
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Comparison of DC Motors and Dielectric Elastomer Actuators For Wearable Wrist Exoskeletons
Paralysis or loss of strength resulting from stroke requires patients to undergo extensive rehabilitation therapy. It is known that intensive therapy contributes significantly to recovery, but as the number of surviving stroke patients increases, it is difficult for clinics to provide patients with …
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Micro-Manipulation and Bandwidth Characterization of Ionic Polymer Actuators
Ionic polymer materials are a class of electroactive polymers that have been used in recent applications that take advantage of their large bending deflection. Although these materials have been around since the 1960s, it has only been in the last decade that their electromechanical coupling has …
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