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 52 for “"Microgel"”.
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YIELDING PHENOMENA IN MICROGEL SUSPENSIONS ACROSS LENGTH SCALES
… or colloidal particle gels, or densely packed microgels—microscopic, swollen, cross-linked polymer particles. Understanding the connections among structure, microscopic behaviors, and macroscopic properties is critical for developing advanced and sustainable materials. During my PhD research, I …
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Controlling the interfacial behaviour of colloidal microgel systems
Hydrophobically modified colloidal microgel particles were prepared by a surfactant-free emulsion polymerization of N-isopropylacrylamide (NIPAM) with more hydrophobic vinyl ether/ester/silane co-monomers (10 % total mass monomer). Most of the resultant dispersions were novel co-polymer microgels …
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Fundamentals of Microgel Flooding and Nanoparticles-Stabilized Foams in Enhanced Oil Recovery
… the concentration and mechanical property of microgels, the size ratio of microgel to pore throat, and the flux. Second, we produce monodisperse nanoparticles-stabilized foams and characterize their morphology, stability, and rheology; these foams exhibit long-term stability and much higher …
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Spatially-defined quantitative interleukin 6 (IL-6) detection using polyethylene glycol microgel sensors (μGELISA)
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Synthesis, physico-chemical properties and potential applications of colloidal gel particles
… poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive surfaces. The mass of microgel particles deposited on glass pre-treated with acid, glass pre-treated with base, quartz, stainless steel, gold and Teflon at …
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Colloidal microgels as (trans)dermal drug delivery systems
In this study microgels have been used as novel drug carriers (i.e. a novel controlled drug delivery system) for either dermal or transdermal delivery. The experiments conducted in this project were, firstly, to investigate the uptake and release of model compounds with different physico-chemical …
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Co-polymer microgels: contemporary physico-chemical, structural and analytical investigations
… NIPAM is a monomer commonly employed in microgel synthesis and the resultant particles are thermosensitive, a property which can be altered by modification of the system by co-polymerisation. A series of colloidal microgels have been prepared by surfactant-free emulsion polymerisation …
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Microstructure and Mechanics of Poly(n-Isopropylacrylamide) Based Responsive Fluids
… sensitive swellable poly(N-isopropylacrylamide) microgels has been studied. The strength and range of the colloidal interparticle interactions are manipulated by controlling the temperature dependent size of the poly( N-isopropylacrylamide) microgels. We first characterize the temperature and …
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Solution Properties of Polymer Nanostructures Studied by Scattering Techniques
… dendronized polymers and the thermosensitive microgel systems. The work comprises of different polymer nanostructured systems mainly studied by using the scattering techniques at the solution state . The importance of the studying the solution properties of the polymer systems can be related …
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Colloidal microgels: synthesis, characterisation and applications
Four sets of NIPAM and non-NIPAM based colloidal microgels have been synthesized by a surfactant-free emulsion polymerisation (SFEP) technique, which are: (i) poly (NIPAM) based homo-polymer, (ii) poly (NIPAM) based co-polymer, (iii) hydrophobically modified homo-polymer and (iv) hydrophobically …
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Dissecting Pluripotency and Mammalian Embryonic Development via Droplet Microfluidics
… system to encapsulate ESCs into agarose microgels, three-dimensional scaffolds that are in terms of their mechanical and biochemical properties fundamentally different from conventional tissue culture in plastic dishes. Subsequently, I investigated how these microenvironmental changes …
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Engineering Dynamic Granular Composites for the Repair of Cartilage Tissue
… over fusion. Hydrogel microparticles, known as microgels, are being jammed together into granular hydrogels, that are injectable, stabilizing via inter-particle crosslinking, and guiding tissue formation through microporosity and microgel properties. This thesis developed granular composites, …
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N-Vinylcaprolactam based Bulk and Microgels: Synthesis, Structural Formation and Characterization by Dynamic Light Scattering
… on N-vinylcaprolactam (VCL). Formation of PVCL microgels in presence of poly(vinyl alcohol) as stabilizer was studied. Size of resulting microgels strongly depends on the temperature and heating rate: interparticle aggregation was observed during slow heating and intraparticle collapse during …
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Advancing techniques for engineered tissue models of the bone marrow
… due to their composition by discrete microgel subunits that are packed together. We tuned the synthesis conditions for gelatin maleimide, enabling microfluidic emulsion of monodisperse, cell-laden microgels. Building on that foundation, we developed a first-generation microgel-based …
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Polyacrylamide and its derivatives for oil recovery
… system was developed to synthesize PAMs and PAMs-microgel. Products are dry particle powder and ready to disperse in water. Compared to traditional methods, less surfactant was consumed, and the required energy cost post-treatments, like drying, were not necessary. Hydrophobically modified PAMs …
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The development of novel smart wound dressings based on colloidal microgels and cotton fabric
A series of microgels have been prepared by a surfactant free emulsion polymerisation based on an N-isopropylacrylamide (NIPAM) monomer. Poly(NIPAM) is a thermo sensitive polymer which undergoes a conformational transition close to the human skin temperature. Poly(NIPAM) was co-polymerized with …
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Fabrication and light scattering study of multi-responsive nanostructured hydrogels and water-soluble polymers.
Monodispersed microgels composed of poly-acrylic acid (PAAc) and poly(N-isopropylacrylamide) (PNIPAM) interpenetrating networks were synthesized by 2-step method with first preparing PNIPAM microgel and then polymerizing acrylic acid that interpenetrates into the PNIPAM network. The semi-dilute …
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Development of Mesoporous Silicas, Responsive Polymer Microgels, and Related Nanocomposites
… the preparation of glucose-responsive polymer microgels (Chapter 4-6). In Chapter 4 and 5, two kinds of dye-composited microgel sensors have been developed, and they exhibited good stability, high selectivity, and good reproducibility for detection of glucose. In Chapter 6, a glucose responsive …
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Elucidating the Role of Plakoglobin in Embryonic Stem Cell Culture
… cells were cultured in three-dimensional agarose microgels generated by droplet microfluidics. The three-dimensional matrix of the microgels supported the naïve pluripotency network and upregulated Plakoglobin. A cell-adhesion protein located in both adherens junctions and desmosomes. It is …
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