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Showing 1 to 20 of 66 for “"poly(N-isopropylacrylamide)"”.
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Poly(N-Isopropylacrylamide)-based scaffolds for tissue engineering applications
… of this work is to investigate the potential of poly(Nisopropylacrylamide)- based scaffolds in tissue engineering applications, specifically spinal injury and nucleus pulposus replacement. Poly(N-isopropylacrylamide), denoted PNIPAAm, is a synthetic polymer with hydrophilic properties at room …
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Microstructure and Mechanics of Poly(n-Isopropylacrylamide) Based Responsive Fluids
… particles and temperature 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 …
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Design and fabrication of microfluidic valves using poly(N-isopropylacrylamide)
… compact printable microfluidic valve composed of poly(N-isopropylacrylamide) has been designed, fabricated, and tested. The design of the valve consists of filling microwells with poly(NIPAAm) and bonding PDMS channels above them. This filling is achieved using thermal inkjet printing of a …
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Ratiometric fluorescent metal ion indicators based on functionalized poly(N -isopropylacrylamide)
… transition of a well-known stimuli-responsive polymer poly(N-isopropylacrylamide) (PNIPAM) is presented. The sensing mechanism involves the polymer conformational change resulting from charge neutralization by the analyte metal ions. The ultimate goal is to develop ratiometric fluorescent …
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The synthesis and development of novel, easily processable poly (n-isopropylacrylamide)-based hyrdogels.
… temperature. Beyond this temperature, the polymer/clay precursor hydrogel liquid (PCPH) spontaneously forms a cross-linked hydrogel that does not re-liquefy upon re-heating, but instead, possesses all of the highly utilisable stimuli-responsive properties typical of PNIPAM-based …
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Synthesis and characterization of tethered poly(n-isopropylacrylamide) for quantitative cell adhesion studies
Environmentally responsive (or smart') polymers represent a new approach for controlling biofouling release. Poly(N-isopropylacrylamide) (PNIPAAm) is a thermo responsive polymer that can potentially be used to control biofouling, as it exhibits a change in its relative hydrophobicity above and …
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An Investigation of Poly(N-Isopropylacrylamide) for Applications with Microfluidic Paper-Based Analytical Devices
… m>,<em>N</em>′-methylenebisacrylamide-crosslinked poly(N-isopropylacrylamide), also known as P(NIPAM), was developed as a fluid delivery system for use with microfluidic paper-based analytical devices (microPADs). MicroPADs are postage-stamp-sized devices made out of paper that can be used as …
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Single molecule tracking studies of lower critical solution temperature transition behavior in poly(N-isopropylacrylamide)
… single molecule tracking, SMT, experiments in poly(n-isopropylacrylamide, pNIPAAm, were carried out using probe fluorophores that had partitioned into the polymer. When the pNIPAAm switches from expanded to collapsed at elevated temperatures, the free volume accessible to the diffusing …
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Stable Polymer Micelle Systems as Anti-cancer Drug Delivery Carriers
<p>Several temporarily stable polymer micelle systems that might be used as ultrasonic-activated drug delivery carriers were synthesized and investigated. These polymeric micelle systems were Plurogel®, Tetronic®, poly(ethylene oxide)-b-poly(N-isopropylacrylamide) and poly(ethylene …
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Synthesis and study of crystalline hydrogels, guided by a phase diagram.
Monodispersed nanoparticles of poly-N-isopropylacrylamide-co-allylamine (PNIPAM-co-allylamine) and PNIPAM-co-acrylic acid (AA) have been synthesized and used as building blocks for creating three-dimensional networks. The close-packed PNIPAM-co-allylamine and PNIPAM-co-AA nanoparticles were …
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Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers
Two grafted polymer layers were synthesized, for diffusion studies, with surface-initiated polymerization (SIP). The results suggest that there is very little bulk translational diffusion in first layer, poly (N-isopropylacrylamide) (PNIPAM). Rather, fluorescence recovery is thought to be due to …
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Self-assembly behavior in hydrophilic block copolymers
Block copolymers are receiving increasing attention in the literature. Reports on amphiphilic block copolymers have now established the basis of their self-assembly behavior: aggregate sizes, morphologies and stability can be explained from the absolute and relative block lengths, the nature of the …
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Chemical sensors based on swellable molecularly imprinted polymer microspheres in a hydrogel
… sensors based on swellable molecularly imprinted polymer microspheres is presented. These sensors were successfully used to measure norephedrine and theophylline in water and in buffer at neutral pH.</p><p>A new method was developed for preparing swellable norephedrine templated poly …
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Perturbation studies of excitable media
Poly(N-isopropylacrylamide) (PNIPA) based systems are probably the most often studied polymer gels due to their dramatic change in volume, swelling and deswelling. Since this system has the best response to pH between 4 and 7, the ferrocyanide-iodate-sulfite (FIS) reaction, which exhibits pH …
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A Thermal Switch from Thermoresponsive Polymer Aqueous Solutions
… the transition properties of thermoresponsive polymer for drug delivery, its potential in thermal switch can be expected. I used Poly(N-isopropylacrylamide) (PNIPAM) as an example to show the abrupt thermal conductivity change of thermoresponsive polymer solutions below and above their phase …
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The preparation and characterization of thermo-sensitive colored hydrogel film and surfactant-free porous polystyrene three-dimensional network.
Polymer hydrogel films change their properties in response to environmental change. This remarkable phenomenon results in many potential applications of polymer hydrogel films. In this thesis colored thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) hydrogel film was prepared by firstly …
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Experimental spectroscopic and theoretical studies of organic compounds and polymeric structures
… state effects were evident in the spectra. Homopolymeric poly(N-isopropylacrylamide) and poly(4-vinylpyridine) as well as copolymer poly(N-isopropylacrylamide/4-vinylpyridine) [poly(NIPAM/4-VP)] microgels (the latter synthesized using percentage composition of 4-VP in the range of 7.5 – 90 %, …
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Synthesis and Structure-Property Relationships of Polysaccharide-Based Block Copolymers and Hydrogels
Polysaccharides are known as among the most abundant natural polymers on the Earth. As this class of material is usually renewable, biodegradable, biocompatible in many contexts and environmentally friendly, it is of great interest to use these benign polymers to design and prepare materials, …
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An Injectable Thermosensitive Hydrogel Potentially Used for Wound Dressing with Self-adhesive Properties
… retention of cells and drugs in the local sites. Poly (N-Isopropylacrylamide) (PNIPAM) could be applied because PNIPAM-based polymers can achieve fast gelling at body temperature. Additionally, the introduction of dopamine could provide self-adhesive property for wound dressing applications …
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Design, Fabrication and Applications of Organic-Inorganic Hybrid Systems
… of colloidal template particles including, polystyrene, poly (vinylcaprolactam) and poly (N-isopropylacrylamide) was used for the deposition of a variety of metal oxides/hydroxide nanoparticles. A classical surfactant free co-polymerization process was employed for the synthesis of these …
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