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 14 of 14 for “"Polymer beads"”.
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An investigation of occlusions within polymer beads produced by suspension polymerisation
Occlusions of some of the continuous phase within polymer beads produced by suspension polymerisation is well-known, although little understood by the polymer industry. Occluded aqueous phase of levels approaching 30'/o (w/w) can give rise to major difficulties in handling the finished product, …
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Synthesis and applications of functional magnetic polymer beads; synthesis and mass spectrometry analysis of model peptides
… synthesis and application of functional magnetic polymer beads. The traditional suspension polymerization approach was used to synthesize polystyrene-iron oxide (Fe 3 O 4 ) based magnetic beads. The beads were coupled to different surface functional groups. The Fe 3 O 4 particles were encapsulated …
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Design and Materials Applications of Quadruply Hydrogen-Bonding Modules
… of siliceous surfaces and nanoparticles, and polymer beads were covalently modified to bear DeUG. These surfaces were characterized by a number of complementary surface analysis techniques, such as AFM, SIMS and XPS. Self-assembly of DAN and DAN-functionalized polymers on these materials was …
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Intradermal needle-free powdered drug injection
… are also explored. In vitro injection of polymer beads (1-5 [mu]im in diameter) into porcine tissue demonstrate the device's capability of drug delivery to depths of 260 to 5000 [mu]m. The jet parameters of nozzle orifice diameter and applied pressure are shown to affect injection depth, …
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Applications of Molecular Switching and Logic
… analysis is presented in chapter 2 for polymer beads which are tagged with multi-valued logic gates, YES, (2YES + PASS 1), (YES + PASS 1), (YES + 2PASS 1) and PASS 1 with H+ input, 700 nm near-infrared fluorescence output and 615 nm red light excitation. The gates carry an azaBODIPY …
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A Systems Approach to the Modeling and Control of Molecular, Microparticle, and Biological Distributions
… robustness analysis. Free radical bulk polymerization is the model system for molecular distributions. In situ ATR-FTIR spectroscopy was used to determine monomer concentration; off-line gel permeation chromatography was used to determine the molecular weight distribution. Kinetic …
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Ultrasonically Enhanced Mass Transport and Degradation of Polycyclic Aromatic Hydrocarbons in Solid-Liquid Two Phase Partitioning Systems
… of these contaminants from soil utilizing polymer beads, with subsequent PAH release and degradation in solid-liquid two phase partitioning bioreactors (TPPBs). Although such a process was successful, significant mass transport limitations involving PAH release from the polymers hampered …
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Non-isothermal non-Newtonian flow and interlayer adhesion in Large Area Additive Manufacturing polymer composite deposition.
… of short carbon fiber reinforcement to the polymer feedstock. The addition of short carbon fibers improves the anisotropic mechanical and thermomechanical properties of printed beads which are dependent on the spatially varying orientation of carbon fibers. In this research, the finite …
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A Study of Polymer-Small Molecule Interactions for Solid-Liquid Two Phase Partitioning Bioreactors With Emphasis on the Bioproduction of 2-Phenylethanol
… alternative is a solid-liquid system in which polymer beads are used, absorbing and removing target compounds from the aqueous phase while maintaining equilibrium conditions. In such systems, the capability of a polymer to absorb the compound of interest is an important parameter. This work has …
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Synthesis and Biological Investigation into the Metabolism of Retinoids
… metabolism of retinoids was initiated. AG1 X2 polymer beads were used to deliver various concentrations of AT retinol solutions in DMSO to the anterior margin of a stage 20 chick limb bud which was then observed at stage 36 for signs of abnormal development such as digit duplication. Occurrence …
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Design and Materials Applications of Quadruply Hydrogen Bonding Modules
… reversible formation of supramolecular network polymers as demonstrated by the reversible transition from gel to solution phases. In Chapter 4, the application of the DeUG·DAN heterocomplex in the arena of surface chemistry is described. Several types of siliceous surfaces and nanoparticles, and …
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Controlled synthesis of magnetic particles
… water (S/O/W) type emulsions. When polymers that are incompatible with the nanoparticle coatings were included in the emulsion formulation, monolayer- and multilayer-coated polymer beads and partially coated Janus beads were prepared. The precise number of nanoparticle layers …
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Single-Particle Orbit Tracking - Setup, Characterisation and Application
… of single fluorescently labeled polystyrene beads, either 20nm or 50nm in diameter, with a high spatial and temporal resolution is introduced. Combining single molecule fluorescence techniques with a new method called single-particle orbit tracking the spatial position of the beads could be …
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The dynamics of polymer solutions: Effects of concentration, chain architecture, and flow
The dynamics and rheology of polymer solutions are crucial to understanding and designing a broad range of polymer processing applications and biological systems. The microscopic conformational dynamics of polymers are directly related to the rheological response of solutions in processing flows. …