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Showing 1 to 20 of 84 for “"N-isopropylacrylamide"”.
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Poly(N-Isopropylacrylamide)-based scaffolds for tissue engineering applications
… 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
… 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 characterize …
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Design and fabrication of microfluidic valves using poly(N-isopropylacrylamide)
… 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 prepolymer …
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Ratiometric fluorescent metal ion indicators based on functionalized poly(N -isopropylacrylamide)
… 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 indicators for free …
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The synthesis and development of novel, easily processable poly (n-isopropylacrylamide)-based hyrdogels.
This work describes the invention of a synthetic method which allows a fully-reacted PNIPAM/clay nanocomposite system to remain a watery liquid until it is cooled to a predetermined temperature. Beyond this temperature, the polymer/clay precursor hydrogel liquid (PCPH) spontaneously forms a …
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Synthesis and characterization of tethered poly(n-isopropylacrylamide) for quantitative cell adhesion studies
… 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 below its lower critical solution temperature (LCST ~ 32\uf0b0C). This …
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An Investigation of Poly(N-Isopropylacrylamide) for Applications with Microfluidic Paper-Based Analytical Devices
… 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 platforms …
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Single molecule tracking studies of lower critical solution temperature transition behavior in poly(N-isopropylacrylamide)
… 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 molecules …
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Stable Polymer Micelle Systems as Anti-cancer Drug Delivery Carriers
… Tetronic®, poly(ethylene oxide)-b-poly(N-isopropylacrylamide) and poly(ethylene oxide)-b-poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate-lactaten). In previous work in our lab, Pruitt et al. developed a stabilized drug carrier named Plurogel® [5, 6]. Unfortunately, the rate of …
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Evaluating bacterial cell immobilization matrices for use in a biosensor
… The thermally reversible gel, NIPA-co-AAc (N-isopropylacrylamide-co-acrylic acid), shows promise as an immobilization matrix for the bacteria; however its high lower critical solution temperature (LCST) of ~33oC is problematic for typical, ambient applications. Another thermally reversible …
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Novel Precursors for Polymer-Protein-Conjugate Synthesis via Reversible Addition-Fragmentation Chain Transfer Polymerization
The RAFT polymerization of N-isopropylacrylamide with two different chain transfer agents, namely benzyl 1-pyrrolecarbodithioate and cumyl 1-pyrrolecarbodithioate, yielded polymers with narrow molecular weight distributions as well as Mn values that were in good agreement with the calculated ones. …
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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
… translational diffusion in first layer, poly (N-isopropylacrylamide) (PNIPAM). Rather, fluorescence recovery is thought to be due to either rotational diffusion or a combination of fast surface diffusion and slow bulk diffusion. Increasing relative humidity enhanced recovery. FRAP results for …
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Self-assembly behavior in hydrophilic block copolymers
… Glucose-modified polybutadiene-block-poly(N-isopropylacrylamide) copolymers were prepared and their self-assembly behavior in water studied. The copolymers formed vesicles with an asymmetric membrane with a glycosylated exterior and poly(N-isopropylacrylamide) on the inside. Above the low …
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Chemical sensors based on swellable molecularly imprinted polymer microspheres in a hydrogel
… swellable norephedrine templated poly (N-isopropylacrylamide-acrylic acid) (poly NIPA-AAc) particles by suspension polymerization in a perfluorocarbon solvent using ultrasonic emulsion technique. The particles were crosslinked with 5% of N, N'-methlene-bis-acylamide (MBA) using 20% …
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Synthesis, physico-chemical properties and potential applications of colloidal gel particles
Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive …
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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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Synthesis and study of the micellization behavior of a dual temperature- and pH-responsive PAA-b-PNIPAM block copolymer
… and pH-responsive poly(acrylic acid-block-N-isopropylacrylamide) (PAA-b-PNIPAM) diblock copolymers with different relative chain lengths of the hydrophobic and hydrophilic blocks were synthesized by reversible addition fragmentation chain transfer polymerization. The preliminary results …
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A Thermal Switch from Thermoresponsive Polymer Aqueous Solutions
… 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 transition temperature. A novel technique, transition grating method, is used to measure the …
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The preparation and characterization of thermo-sensitive colored hydrogel film and surfactant-free porous polystyrene three-dimensional network.
… In this thesis colored thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) hydrogel film was prepared by firstly synthesizing polymer latex and secondarily crosslinking the nanoparticles and casting the polymers onto glass. The shape-memory effect has been observed when changing the …
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