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 21 for “"ionic polymers"”.
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Charge Control of Ionic Polymers
… result; however, using current to actuate the polymers also produces back relaxation in the response. Examination of the back relaxation reveals a low frequency non-linearity. The nonlinearity is quantified by the fact that the gain associated with the back relaxation does not increase linearly …
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Energy Harvesting Applications of Ionic Polymers
… the development and analysis of applications for ionic polymers as energy harvesting devices. The specific need is a self-contained energy harvester to supply renewable power harvested from ambient vibrations to a wireless sensor. Ionic polymers were investigated as mechanical to electrical energy …
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Mixing at Low Reynolds Numbers by Vibrating Cantilevered Ionic Polymers
… device developed herein capitalized on Nafion ionic polymers, which are a class of active materials that are thin, flexible, inexpensive, and readily deployable in an aqueous medium and offer strains up to 5% under a small (<2V) applied voltage. The effect of these deflections on an incident …
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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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Transport and Anisotropy inside Ionic Polymer Membranes
… heterogeneity and molecular interactions inside ionic polymers. I first discuss a main deficiency of a standard protocol for calibrating high pulsed-field-gradient NMR. I show that high gradient calibration using low γ nuclei is not amenable to measurements on slow diffusing high γ nuclei. Then I …
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Elucidating bioadhesive processes in nasal drug delivery systems
… assessed. The greatest thixotropy was found with polymers of increasing molecular weight whereas low molecular weight polymers exhibited little or no thixotropy. As expected, high molecular weight polymers produced strongly gelled networks; a requirement for mucoadhesion. Mucoadhesive interactions …
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Characterization, Modeling, and Control of Ionic Polymer Transducers
Ionic polymers are a recently discovered class of active materials that exhibit bidirectional electromechanical coupling. They are `soft' transducers that perform best when the mechanical deformation involves bending of the transducer. Ionic polymers are low voltage actuators -- they only require …
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Molecular design of precise ionic polymer networks for fundamental structure-property-relationships and energy-related applications
… with high stability and ""liquid-like"" ionic conductivity. In this dissertation, two model systems of network ionic polymers (nIPs) are carefully designed and investigated on how molecular structures affect their functional properties such as ionic conductivity, glass transition, and …
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Probing Transport of Ion Dense Electrolytes using Electrophoretic NMR
… ENMR on highly ion-dense electrolytes such as ionic liquids and electrolytes for zinc-air batteries. I design a new electrophoretic NMR sample cell using parallel capillaries to investigate the electrophoretic mobilities of pure ionic liquids. It shows the first study of a highly ion-dense …
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Synthesis and Non-Covalent Interactions of Novel Phosphonium-Containing Polymers
… thermal stability, and antibacterial activity. Ionic aggregation in phosphonium-based polymers provides thermoreversible crosslinks, ideal for reversible self-assembly, self-healing, and smart response. In polymers, these ionic functionalities aggregate, providing improved moduli, and altering …
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Variational Modeling of Ionic Polymer-Based Structures
Ionomeric polymers are a promising class of intelligent material which exhibit electromechanical coupling similar to that of piezoelectric bimorphs. Ionomeric polymers are much more compliant than piezoelectric ceramics or polymers and have been shown to produce actuation strain on the order of 2\% …
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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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Multilayer Ionic Transducers
A transducer consisting of multiple layers of ionic polymer material is developed for applications in sensing, actuation, and control. The transducer consists of two to four individual layers each approximately 200 microns thick. The transducers are connected in parallel to minimize the electric …
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Membrane Stabilizing Copolymer Poloxamer 188 in Preclinical Models of Acute Myocardial Infarction Reperfusion
… member of the poloxamer family, comprised of non-ionic polymers made of a hydrophobic core, flanked by hydrophilic end chains. Due to its membrane stabilizing and anti-coagulant properties, P188 remains a favorable agent to prevent membrane damage in several disease models including sickle cell …
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Poly(ionic liquid) stabilizers and new synthetic approaches
… to investigate the stabilization ability of poly(ionic liquid)s (PILs) in several examples as well as develop novel chemical structures and synthetic routes of PILs. The performed research can be specifically divided into three parts that include synthesis and application of hybrid material …
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Design, Synthesis and Self-Assembly of Polymeric Building Blocks and Novel Ionic Liquids, Ionic Liquid-Based Polymers and Their Properties
… methods. Host-guest complexations of polymers are also possible through well-defined synthesis of polymeric building blocks, for novel supramolecular polymers. Monotopic polymeric building blocks were synthesized by controlled radical polymerizations with a crown or paraquat initiator. …
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Characterization and patterned polymer films from a novel self-assembly process
… layer-by-layer molecular-level manipulation of ionic polymer have been utilized to fabricate ultrathin multilayer films (SAMp). In this process, monolayers of polycations and polyanions are sequentially adsorbed onto a substrate surface by alternately dipping the substrate into aqueous solutions …
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Feedback Control of Ionic Polymer Actuators
An ionic polymer actuator consists of a thin Nafion-117 sheet plated with gold or platinum on both sides. An ionic polymer actuator undergoes large deformation in the presence of low applied voltage across its thickness and exhibits low impedance. They can also be used as large displacement sensors …
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Ion and polymer transport in polymerized ionic liquids
Polymerized ionic liquids (PILs) is a novel type of ionic polymers in which small molecule ionic liquids (ILs) are covalently attached to a polymer backbone. The advantages of ILs include high thermal and electrochemical stability, high ionic conductivity, negligible volatility and board design …
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Hydration Mechanisms in Sulfonated Polysulfones for Desalination Membrane Applications
… The polysulfones investigated here are aromatic polymers with relatively high ion contenremain in the glassy state at room temperature even when fully hydrated. In order to better understand the effects of water on these ionic polysulfones molecular dynamics (MD) simulation is used to investigate …
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