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 25 for “"methylmethacrylate"”.
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Fabrication of DNA microarrays on Poly (methylmethacrylate) substrates for biomolecular reporting
DNA microarrays require the use of substrates with well-established surface modification / probe attachment chemistries. Glass/quartz have been widely adopted as typical support materials since their surface modification chemistries which involve the use of siloxane –based chemistries have been …
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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
… probe of morphology in well-defined poly(methylmethacrylate) -poly(dimethylsiloxane) graft copolymers has been given special emphasis. The synthesis these graft copolymers has been accomplished by the copolymerization of model, methacrylate-functional, poly(dimethylsiloxane) CPDMS) …
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Hypersonic phononic crystals
… 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 composition using Brillouin light scattering and numerical simulations. This set of …
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A study in radiopaque polymeric materials
… to be effective. Investigation of copolymers of methylmethacrylate and p-bromostyrene revealed no deleterious effects arising from the aromatically brominated monomer (aliphatic bromination caused UV destabilisation). For effective x-ray absorption a higher level of bromination would be …
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Polymerisation of vinyl monomers in continuous-flow reactors. An experimental study, which includes digital computer modelling, of the homopolymerisation of styrene and methylmethacrylate by anionic and free radical mechanisms respectively in continuous flow-stirred-tank reactors.
… for the free radical, solution polymerisation of methylmethacrylate in a CSTR. Both heat and mass balance expressions have been described. Conversion, Mn and Mw were monitored. To test the model a reactor was designed and constructed. A detailed description of the reactor and the experimental …
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Magneto-Optic Spectroscopy and Near-Field Optical Coupling in Nanoparticle Composite Materials
… 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
… 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 by 200 …
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Finite Element Analysis Of A Test Specimen For Strength Of A Co-polymer Layer At A Bone-implant Interface
… of 2-hydroxyethylmethacrylate (HEMA) and methylmethacrylate (MMA), so that it can be applied as an interfacial layer between bone cement and steel implants to improve their performance and life. Finite element (FE) analysis techniques are used to assess the behavior of the interface layer …
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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
… as a compatible polymerization medium for poly(methylmethacrylate ) networks enabling the formation of transparent and fluorescent composites.
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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 attempted …
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Inorganic/organic hybrid polymers
… after calcining were incorporated into poly(methylmethacrylate) and these samples were compared with pure poly(methymethacrylate) in a cone calorimeter to study their thermal properties. No significant enhancement to the thermal stability of the polymers was observed when the silica was …
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From Micro- to Nano-Scale: Applications of Solid-Phase Enzymatic Reactors for Biopolymer Disassembly
… 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
… micro- and nanofluidic networks in poly(methylmethacrylate), PMMA, using thermal nanoimprint lithography using a resin stamp and surface modification of polymer nanoslits and nanochannels for the assessment of the associated electrokinetic parameters – surface charge density, zeta …
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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
… 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 radical …
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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 devices …
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Polymer-Based Microfluidic Devices for High Throughput Single Molecule Detection: Applications in Biological and Drug Discovery
… 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 demonstrated by …
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