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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 34 for “"poly(allylamine)"”.
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The use of novel poly(allylamine) based amphiphilic polymers for drug delivery.
Fourteen novel comb shaped amphiphilic polymers were successfully synthesised to determine the effect of polymer architecture on the potential of these amphiphilic polymers for hydrophobic drug delivery. Polyallylamine (PAA) was grafted with four different types of hydrophobic pendant groups …
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New polymeric biomaterial interfaces for biosensor applications
… patterned to generate cellular array templates: poly(allylamine)-g- poly(ethylene glycol) graft-copolymer and poly(ethylene glycol) dimethacrylate hydrogel. Poly(allylamine)-g-poly(ethylene glycol) polycation graft-copolymers were designed, synthesized, and characterized in order to combine …
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Characterization of new surface morphologies in a hydrogen-bonded multilayer system
… an analysis of surface morphology changes in poly(acrylic acid)/polyacrylamide (PAA/PAAm) hydrogen-bonded multilayers. These changes were induced by immersion of the films in aqueous solutions of poly(allylamine hydrochloride), or PAH, at different levels of pH. Positive charges on PAH are …
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Koloidinių tirpalų sudarytų iš polimerinių ir metalinių nanodalelių tyrimai /
Polymeric and metallic nanoparticles are extensively used in wide range of scientific areas. High interest in nanoparticles is due to new and unusual properties of materials that occur only at nanoscale. Polyaniline (PANI) is one of the most extensively studied conducting polymer. Silver …
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Surface engineering using layer-by-layer assembly of pH-sensitive polymers and nanoparticles
… by using layer-by-layer assembly of pH-sensitive polymers and nanoparticles. In the first part of this thesis, hydrogen-bonded multilayer coatings comprising poly(acrylic acid) and polyacrylamide were used to functionalize spherical colloidal particles. Multilayer-modified colloids showed an …
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Fundamental studies of pH-sensitivity in polyelectrolyte multilayers
… of the pH-sensitive behavior of weak polyelectrolytes, such as poly(acrylic acid)(PAA) and poly(allylamine hydrochloride) (PAH) from two perspectives of the assembled multilayers - functional group composition and layer growth. In the first part of this thesis, with respect to the …
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Biological applications of weal polyelectrolyte multilayers
… on biological applications of ultra-thin weak polyelectrolyte multilayers with specific emphasis on cell patterning, drug delivery, and antibacterial coatings. All of these very different applications were studied using three different polymers - polyacrylic acid (PAA), poly(allylamine …
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Polyelectrolyte multilayers as nanostructured templates for inorganic synthesis
… of inorganic matter embedded within a soft polymeric matrix on the nanometer length scale are an important class of materials with potential application in optoelectronics and photonics, magnetic media, and batteries and fuel cells. In addition to the component material properties, the …
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Polyelectrolyte multilayers : nanofabricated architectures for bio-interface materials
… whereby aqueous solutions of oppositely charged polymers are alternately and repeatedly deposited onto a substrate, has emerged in recent years as a promising approach for creating thin films with nanoscale control of structure, composition, and surface properties. Applications ranging from …
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Tribological and mechanical characterizations of polyelectrolyte multilayer nanoassemblies
… layer-by-layer assembly of oppositely charged polyelectrolytes has received much interest for the deposition of film architectures, ranging from tens to hundreds of nanometers in thickness, that can be precisely tuned as a function of the processing conditions. The resulting polyelectrolyte …
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Study of the effect of mechanical stiffness substrata, assembled with polyelectrolyte multilayer thin films, on biofilm forming staphylococcus epidermidis' initial adhesion mechanism
Polyelectrolyte multilayer thin films are polymer films assembled through a layer-by-layer sequential addition of oppositely charged polymers. The layer-by-layer film assembly technique allows for properties such as film thickness, chemical functionality, and elastic moduli to be easily altered by …
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Ion Conducting Polyelectrolytes in Conductive Network Composites and Humidity Sensing Applications for Ionic Polymer-Metal Composite Actuators
Ionic polymer-metal composites (IPMCs) are widely studied for their potential as electromechanical sensors and actuators. Bending of the IMPC depends on internal ion motion under an electric potential, and the addition of an ionic liquid and ionic self-assembled multilayer (ISAM) conductive network …
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Nanoscale surface modification of wood veneers for adhesion
… attachment of amine containing water soluble polyelectrolytes provides a path to create functional surfaces in a controlled manner. Furthermore, modification of the surface can be performed using layer-by-layer (LbL) assembly, where the adsorption of polyelectrolytes or nanoparticles in …
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Novel Liquid extraction method for detecting Native-wood Formaldehyde
… groups is needed. In this study cross-linked poly (allylamine) (PAA) beads were synthesized and used as a strong nucleophile to extract all the biogenic and synthetic free-formaldehyde within the woody matrix of never-heated and heat-treated Virginia pines; the results were compared to simple …
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Development of a non-living model system for cell membranes and investigation of its mechanical and tribological properties
… through layer by layer deposition of alternating poly(allylamine hydrochloride) (PAH)and poly(sodium 4-styrenesulfonate) (PSS) polyelectrolyte multilayers (PEM). Single step bilayer formation was observed under QCM on the PAAm-PEM support owing to high electrostatic interactions between the PEM …
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PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers
… explores the design of novel pH-responsive polyelectrolyte multilayer (PEM) films. The discoveries of discontinuous pH-induced swelling transitions and concomitant conformational memory effects as well as pH-gated nano- and microporosity in PEMs, are described. The PEMs in this thesis are …
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Molecularly Imprinted Polymers for the Recognition of Tobacco Viruses
… of virus recognition in molecularly imprinted polymers (MIPs) using already utilized techniques. The clinical relevance of this study relates to the development of a virus imprinted MIP, which would apply to the identification, classification, and removal of viruses. The separation of viruses …
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Engineering the microfabrication of layer-by-layer polyelectrolyte assembly
The feasibility of microstructuring polyelectrolyte multilayers has been established by using the layer-by-layer assembly technique in combination with patterned self-assembled monolayers (SAMs). SAMs of a carboxylic acid surface (COOH) and a triethylene glycol surface (EG) were used to promote and …
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Smart Polymer Electromechanical Actuators for Soft Microrobotic Applications
Ionic electroactive polymer (IEAP) actuators are a class of electroactive polymer devices that exhibit electromechanical coupling through ion transport in the device. They consist of an ionomeric membrane coated with conductive network composites (CNCs) and conductive electrodes on both sides. A …
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Surface plasmon resonance study of the purple gold (AuAl₂) intermetallic, pH-responsive fluorescence gold nanoparticles, and gold nanosphere assembly
… with tunable spacers. These spacers consist of polyelectrolyte multilayers (PEMs) consisting of poly(allylamine hydrochloride) and poly(styrene sulfonate) assembled at pH 8.4. The distance between Au NPs and fluorophores was varied by changing the ambient pH from 3 to 10 and back, which causes …
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