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 “"Poly(methylmethacrylate)"”.
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Fabrication of DNA microarrays on Poly (methylmethacrylate) substrates for biomolecular reporting
… especially at high or low pH values. Recently, polymers have been sought as alternative microarray support materials but their surface modification strategies are not well characterized compared to glass. This report will entail surface photo-modification of PMMA polymer substrates by UV …
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The blending of hydroxypropyl lignin with poly(methylmethacrylate) and poly(vinyl alcohol)
Polymer blends consisting of hydroxypropyl lignin (HPL ) and commercially available poly(methyl methacrylate) (PMMA ) and poly(vinyl alcohol) (PVA) were evaluated in terms of their morphology, viscoelastic properties and mechanical properties. In the case of HPL/PMMA blends experimental variables …
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Morphological effects on gas transport through poly(methylmethacrylate)-poly(dimethlysiloxane) graft copolymers and instrumentation for their synthesis and permeability characterization
… well-defined or "model" block and graft copolymers have received increasing interest among academic and industrial communities. The well-defined nature of such polymers makes them ideal subjects for both fundamental studies and specialty polymer applications. This study addresses the …
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Hypersonic phononic crystals
… phonon dispersion relation for one dimensional polymeric phononic crystals fabricated by coextrusion of a large number of poly(methylmethacrylate)/poly(carbonate) and poly(methylmethacrylate)/poly(ethylene terephthalate) bilayer pairs is investigated as a function of a lattice constant and …
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Magneto-Optic Spectroscopy and Near-Field Optical Coupling in Nanoparticle Composite Materials
… (magnetite) nanoparticles (8 nm diameter) and poly(methylmethacrylate) (PMMA). Composites are made containing a range of nanoparticle concentrations. The peak of the main spectral feature depends on nanoparticle concentration; this peak is observed to shift from approximately 470 nm for (dilute …
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Multinozzle printheads for 3D printing of viscoelastic inks
… was developed. The device was machined out of poly(methylmethacrylate) (PMMA) using a 3-axis CNC mill and contains a bifurcating array of microchannels that split a single stream of ink into 64 streams of equal flow. The device extrudes 64 filaments, each with a square cross section of 200 µm …
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Microbioreactors for bioprocess development
… The microbioreactor is fabricated out of poly(methylmethacrylate) and poly(dimethylsiloxane). Active mixing is made possible by a miniature magnetic stir bar. Online optical measurements for optical density, pH, and dissolved oxygen are integrated. Oxygenation in the microbioreactor is …
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Study of Nanoparticle/Polymer Composites: I) Microstructures and Nonlinear Optical Solutions Based on Single-Walled Carbon Nanotubes and Polymers and II) Optical Properties of Quantum Dot/Polymer Composites
… this dissertation was the study of nanoparticle/polymer composites. Two types of nanoparticles were utilized: Single-Walled Carbon Nanotubes and quantum dots. Chapter 1 of this thesis comprises an extensive literature review on Carbon Nanotubes, which presents theoretical aspects relevant to the …
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Achieving sub-10-nm resolution using scanning electron beam lithography
… characterized the temperature dependence of poly(methylmethacrylate) (PMMA) resist contrast and used the results to create transferable patterns smaller than nearly any published results to date with this resist chemistry. We have also examined the process of electron-beam exposure and …
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Inorganic/organic hybrid polymers
… characterise a range of inorganic/organic hybrid polymers containing pendant vinyl groups and to study their uses as possible fire retardants. The work consisted of several parallel strands: the synthesis of organically modified silicas; the preparation of vinyl containing silsesquioxanes based on …
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From Micro- to Nano-Scale: Applications of Solid-Phase Enzymatic Reactors for Biopolymer Disassembly
… work, the immobilization of λ-exonuclease onto poly(methylmethacrylate) (PMMA) micro- and nano-pillars populated within a fluidic devices for the micro and nanoscale on-chip digestion of double-stranded DNA. Enzyme immobilization in both studies was successfully accomplished using …
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Polymer Micro- and Nanofluidic Systems for In Vitro Diagnostics: Analyzing Single Cells and Molecules
Polymer micro- and nanofluidic systems, with their critical dimensions, offer a potential to outperform conventional analysis techniques and diagnostic methods by enhancing speed, accuracy, sensitivity and specificity. In this work, applications of microfluidics have been demonstrated to address …
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Optical fibre-based minimally-invasive blood glucose monitoring system.
… acid (VPBA) can be incorporated into poly(methylmethacrylate) (PMMA) matrix without losing its ability to bond with glucose. Further, the study achieved the successful fabrication of a VPBA and Rhodamine-6G (Rh-6G) doped optical fibre ring resonator, the performance of which was also …
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Towards Early State Disease Detection in Microdevices: Fabrication and Testing of Micro Total Analysis Systems for Bioanalytical Applications
… channels. I have also shown the evaluation of poly(methylmethacrylate) (PMMA) and thermoset polyester (TPE) microchips for use in protein profiling. To improve separation efficiency and reduce protein adsorption, dynamic coating and poly(ethylene glycol) (PEG) grafting using atom transfer …
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Effects of Low Temperature and Structure on the Photophysics of Alkylammonium Lead Halide Semiconductors
… coated with dodecylammonium lead iodide, a poly(methylmethacrylate) spacer layer, and an evaporated silver mirror. The onset of lasing was seen at 5.6 × 1018 excitations/cm3 at 75 K. Finally, the modulation of open-circuit voltage and short-circuit current by applied magnetic field in OPV …
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Polymer-Based Microfluidic Devices for High Throughput Single Molecule Detection: Applications in Biological and Drug Discovery
… of tightly packed fluidic channels poised on poly(methylmethacrylate), PMMA and contained within the FoV of a laser detection system. The system was used to monitor biochemical reactions at the single-molecule level in a continuous-flow format. Enhancement in sampling-throughput was …
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Three-Dimensional Optical Characterization of Heterogeneous Polymer Systems
… understand the process-property behavior of polymer systems it is essential to identify the three dimensional structure of the materials fabricated. For heterogeneous polymer systems such as nanoparticle filled systems, determination of the three dimensional optical properties are …
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Ordering of Nanoparticles by Wrinkle-Assisted Self-Assembly : Controlling Plasmonic Coupling Effects
… such as detectors, circuits, light sources, polymeric opals or meta-materials. The present work deals with the controlled placement of nanoparticles by physical con-straints. Exact placement of nanoparticles allows for the control of the inter-nanoparticle distance and thus determines the …