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Showing 1 to 20 of 69 for “"microgels"”.
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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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Three dimensionally flocculated proangiogenic microgels for neovascularization
… gel formed from the mixing of negatively charged microgels composed of poly(ethylene glycol) (PEG) microgels and poly(sodium acrylate), and positively charged microgels composed of PEG and poly(vinyl benzyl trimethyl ammonium chloride). The structural strength of the colloidal gel could be tuned …
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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
… by co-polymerisation. A series of colloidal microgels have been prepared by surfactant-free emulsion polymerisation (SFEP) based on the NIPAM monomer. Butyl acrylate (BuAc) has been used as a co-monomer in order to alter the physico-chemical properties of poly(NIPAM) microgel particles. …
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Intelligent Nano/Microgels for Cell Scaffold and Drug Delivery System
<p>Stimulus-responsive polymer microgels swell and shrink reversibly upon exposure to various environmental stimuli such as change in pH, temperature, ionic strength or magnetic fields. Therefore, they become ideal candidates for biomaterial applications. For this work, we focus on the several …
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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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Microenvironmental modification and analysis of 3D cell culture using microgels
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Development and Characterization of Fatty Acid-Coated Microgels Within Microfluidic Systems
Fatty acid-coated hydrogel microstructures (mugels) were prepared within microfluidic devices and their properties were investigated. A photopolymerization technique was used to position pH-sensitive mugels within microchannels, and lipophilic acid chlorides were covalently grafted to these objects …
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The viability and fertility of bovine spermatozoa encapsulated in microcapsules and microgels
… spermatozoa encapsulated in microcapsules and microgels. In Experiment I, one of two morphologically distinct sperm types i.e. marker or unmarked bull spermatozoa (100 x 10⁶ sperm/bull) were encapsulated in protamine sulfate microcapsules and simultaneously inseminated with the reciprocal sperm …
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Synthesis and characterization of stimuli-responsive microgels based on poly(glycidol)block copolymers
… and used to synthesis of temperature sensitive microgels. Conjunction points have been successfully formed by UV irradiation of polymer water solution above cloud point. The influence of such parameters like block ratio, block length, amount of chromophore, concentration, irradiation time, …
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Synthesis of Polysaccharide Aldehydes or Ketones and Fabrication of Derived Hydrogels or Microgels
… and ketones. Their derived hydrogels and microgels were made for potential drug-delivery applications. Polysaccharide aldehydes and ketones are reactive intermediates for adding other functional moieties through chemo selective reactions such as Schiff-base formation or reductive …
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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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Development of mouse morulae after encapsulation in alginate microgels or poly-l-lysine microcapsule
… (42.1 %) when compared to embryos in alginate microgels (17%) and embryos in PLL microcapsules (14.60/0). Additionally, recipients of alginate and PLL encapsulated embryos had more resorption sites (4 0/0 and 13.4%) when compared to recipients of unencapsulated embryos (0%). These …
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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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3D Cell Culture in Microgels: A Novel Screening Platform for Disease Modelling and Drug Testing
… was used to encapsulate CRC organoids in microgels via droplet microfluidics to enable new assays applicable for drug screening. To make the organoid-microgel system applicable to combinatorial drug screening, I developed a barcoding method to couple treatment information to the microgels. …
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Improving Biocompatibility By Controlling Protein Adsorption: Modification And Design Of Biomaterials Using Poly(Ethylene Glycol) Microgels And Microspheres
… containing polymer and protein oligomers and microgels that can be designed to control cell adhesion. Finally, a modular strategy is proposed for the assembly of bioactive PEG-based hydrogel scaffolds. This was accomplished using novel PEG microspheres with diverse characteristics that …
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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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Controlling the interfacial behaviour of colloidal microgel systems
… the resultant dispersions were novel co-polymer microgels and all exhibited a thermo-sensitive volume phase transition. Key properties of the microgels, i.e. size, electrophoretic mobility and volume phase transition temperature (VPTT), were determined by dynamic light scattering (DLS), laser …
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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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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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