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 19 of 19 for “"porous polymer"”.
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Micron-scale liquid engineering for porous polymer patterning
Porous polymer structures have a rich history of applications from insulation and impact absorption to superhydrophobic coatings, controlled drug release materials, biological scaffolds and photonic materials. Different approaches such as lithography, etching and direct templating were developed to …
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Regulation of drug delivery from porous polymer matrices using oscillating magnetic fields
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Medical Engineering and Medical Physics, 1984.
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Nanoporous flexographic printing : fundamentals, applications and scale-up
Printing of ultrathin layers of polymeric and colloidal inks is critical for the manufacturing of electronics on non-conventional substrates such as paper and polymer films, for applications such as smart packaging, asset tracking, and photovoltaics. Among conventional printing processes, …
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A Force Sensor Array for Space Applications
… In this work, capacitive sensors based on a porous polymer-ceramic composite structure were evaluated for potential use in future operations within robotic end-effectors, withstanding temperatures ranging from -80 °C to 120 °C and forces up to 350 kPa. A thin-film design is utilized …
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Hierarchical Assembly of Polymeric Nanofibers for Advanced Material Applications
Polymer nanofibers are gaining importance due to their wide applicability in diverse fields, such as tissue engineering, fuel cells, photonics and sensors. For these applications, manufacturing aligned polymer nanofibers with precisely controlled morphology and well characterized mechanical …
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Multi-Material Fiber Fabrication and Applications in Distributed Sensing
… and fabricated multi-material electrode-embedded polymer fibers with distributed sensing capabilities. Polymers sensitive to temperature and pressure have been incorporated into the fiber structure, and thin metal electrodes placed inside fiber by convergence drawing have enabled detection of …
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Development of simple 3D-printed scaffolds for liver tissue engineering
… complex scaffolds out of biodegradable polymers. These artificial tissues should maintain healthy, functional hepatocytes in proper contact with supporting cell types in the context of proper flow cues. This project comprises three major efforts. First, the design and development of a …
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The Dynamics of Phase Separation and Structure Formation in Phase Inversion
… are presented, the process by which a cast polymer solution is converted into a porous, polymer gel by either thermal or nonsolvent quenching. In all three of the studies presented in this thesis, in-situ optical techniques have been used to study the dynamics of phase separation and …
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Volatile organic compounds in the New England troposphere: Atmospheric chemistry and measurement techniques
… temperature analyte enrichment system, a robust porous polymer stationary phase capillary column and a flame thermionic detector. The instrument was deployed for a I week period in April, 2009 at THF. Measured HCN mixing ratios ranged between 0.07(3) and 0.33(3) ppbv, with significant temporal …
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Polymers from the natural product betulin : a microstructural investigation
Porous materials (e.g. zeolites, activated carbon, etc.) have found various applications in industry, such as the use as sorbents, catalyst supports and membranes for separation processes. Recently, much attention has been focused on synthesizing porous polymer materials. A vast amount of …
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Nanoporous monolayer graphene membranes for water purification : from concept to realization
… the pores. The resulting two-dimensional, nanoporous membrane is predicted to exhibit orders-of-magnitude permeability and selectivity enhancement over existing separation membranes for processes such as desalination of sea or brackish water, water softening, or nanofiltration. Herein, I will …
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Development, manufacture and application of a solid-state pH sensor using ruthenium oxide
… of the pH sensitive RuO2 electrode with a porous polymer junction containing SiO2. The reference electrode showed very low sensitivity to pH and KCl. The reference electrode provided a suitably stable potential over short periods of time, allowing accurate pH measurements to be made. The …
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Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells
… self-assembly systems, that is, liquid crystal-polymer electrolyte composites (LC-PEs), LC binary mixtures, and their potential application in dye-sensitised solar cells (DSSCs). The birefringence of LCs causes light modulation, which can be controlled by an applied voltage and electric field. …
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The functionalisation and application of microporous micro-capillary films for the chromatographic purification of biomolecules
Microporous walled micro-capillary films (MMCFs) are porous polymer films with embedded capillaries. MMCFs have been found to be suitable low-cost chromatography substrates capable of tolerating high flowrates, which suggested they might be a solution to the growing bottleneck in the downstream …
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Synthesis and Characterization of Novel Polybenzimidazoles and Post-modifications for Membrane Separation Applications
… a class of aromatic heterocyclic polymers, are well known due to their remarkable thermal stability, mechanical properties and chemical resistance which are often required in extreme operation conditions. Because of these properties, polybenzimidazoles are excellent candidates in …
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Colorimetric sensor arrays for the detection of aqueous and gaseous analytes
… or mixtures of analytes. The employment of porous glasses as an immobilization technique has allowed for facile detection of analytes, both aqueous and gaseous, by allowing dye-analyte interactions to occur while preventing the sensor dye from escaping from the matrix. In this manner, …
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Polymorphism control and the formation of organic molecular nanocrystals
… nano-sized confinement. Using soft confinement (porous polymer membranes), we reported the use of a novel solution impregnation method to form nanocrystals in polymer matrices with various microstructures to systemically study the role of soft confinement and polymer chemistry on the nucleation …
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Nanostructures templated on biological scaffolds for light harvesting, energy transfer, charge transfer, and redox reactions
… per minute in a prolonged manner. In addition, porous polymer microgels are used as an immobilization matrix to improve the structural durability of the assembled nanostructures and enable the recycling of the materials. The system also maintains a substantial level of its catalytic performance …
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Advanced NMR analysis of polymers and biomolecules
… by NMR spectroscopy and relaxometry on advanced polymers like ultra-high molecular weight polyethylene (UHMWPE), diblock copolymers, isotactic polypropylene / silica nanocomposite, porous polypropylene, and elastomers. Also, the dynamic behaviour of lecithin in bulk and in geometrically confined …