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Showing 1 to 20 of 70 for “"Layer-by-layer (LbL)"”.
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Polyelectrolyte Coatings with Internal Hierarchy
… thesis are focused on the surface modification by polyelectrolytes and polyelectrolyte copolymers. The internal structural hierarchy originate thereby from the self-assembly processes at different length scales. To generate different levels of hierarchy, the coatings were constructed by using …
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Layer-by-layer coated microneedles for cancer immunotherapy
… The drug was incorporated as a releasable multilayer coating on the microneedle surface constructed with alternating absorption of oppositely charged species including protein or nucleic acid drugs and biocompatible polymer carriers, forming a 'sticky' layer-by-layer (LbL) film through …
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Highly absorptive thin films for integrated photonic devices
Highly absorptive thin films serve as the active layer of a new class of photonic devices based on the strong coupling of light and matter. In order to develop these devices into a new field of integrated photonics, methods for analysis, patterning, and deposition of the active layer are necessary. …
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Influence on molecular geometry and chain conformation on properties of polyelectrolyte multilayers
The layer-by-layer (LbL) method of self-assembly is a versatile technique for fabricating thin polymer films. This thesis compares the properties of LbLfilms composed of different weak polycations. Slight perturbations in film assembly conditions can lead to large differences in film properties. …
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Ion transport and structure of layer-by-layer assemblies
Layer-by-layer (LbL) films of various architectures were examined as potential solid state electrolytes for electrochemical systems (e.g. batteries and fuel cells). The relationship between materials properties and ion transport within LbL films was investigated in three systems, described below. …
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Photoinduced wetting kinetics of water on immersed nanoporous titania surfaces with application to oil-water separation
… these structured surfaces are prone to fouling by oil and dirt. The photocatalytic and hydrophilic nature of titania coatings can be exploited to ensure preferential wetting of water over oil under ultraviolet (UV) irradiation and this provides a mechanism for recovery of fouling. Titania …
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Preliminary framework for quantitative sustainable design of redox-mediated electrodialysis for biorefinery separations
… technology that can contain novel layer-by-layer (LBL) membranes and employ a modified cell pair and redox-flow platform. Environmental and chemical engineering industries are gaining interested in modeling redox-ED as it possible that modern advances in the novel layer-by-layer …
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Polyelectrolyte multilayers for tunable release of antibiotics and other therapeutics
Polyelectrolyte multilayers (PEMs) were fabricated via the layer-by-layer (LbL) deposition process, incorporating hydrolytically degradable poly([beta]-amino esters) to result in biodegradable PEMs that can release active ingredients in a dosage- and rate-tunable fashion. Specifically, PEMs …
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Engineering the electrochromism and ion conduction of layer-by-layer assembled films
This work applies the processing technique of layer-by-layer (LBL) assembly to the creation and development of new electrochemically active materials. Elements of the thin-film electrochromic cell were chosen as a particular focus for LBL fabrication. Layer-by-layer assembly is the ideal processing …
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Next generation of electrospun textiles for chemical and biological protection and air filtration
… addition, antibacterial fiber mats were obtained by a post-spin treatment of cellulose acetate fibers. The latter material allowed for the covalent CHX immobilization on the fibers via titanate linkers. The layer-by-layer (LbL) electrostatic assembly technique was applied in combination with …
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Peptide-Functionalized Layer-by-Layer Nanoparticles Demonstrate Improved Blood Brain Barrier Permeability for Glioblastoma Treatment
… brain and are stitched together into a barrier by tight junction complexes. One approach to overcoming this barrier is encapsulating drugs in nanoparticles whose surfaces are engineered (usually, with the addition of ligands) to promote binding to various receptors of the BBB, thus triggering …
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Studying and controlling chromophore orientation in polyelectrolyte layer-by-layer thin films
… technique for the polymeric thin films is layer-by-layer (LBL) electrostatic assembly. This technique takes advantage of the electrostatic attraction between oppositely charged polyelectrolytes to assembly films. For example, a polyanion and polycation are dissolved in separate aqueous …
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Functionalized multilayer thin films for protection against acutely toxic agents
… in order to construct thin films via the Layer-by-Layer (LbL) technique has been further investigated and extended. In this process a fully automated system capable of depositing thin polymer films from atomized mists of solutions containing species of complementary functionality has been …
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Tuning the transport properties of layer-by-layer thin films for fuel cell applications
… polymer films with tunable properties is layer-by-layer (LbL) assembly. This technique consists of building a polymer film by sequential dipping into polymer solutions with complementary interactions, such as opposite electrostatic charges. The LbL method allows the formation of thin films …
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Hydrophobic coatings for film boiling based drag reduction on a torpedo model
… film boiling. Film boiling is characterized by the presence of a vapor layer which remains as long as the surface temperature stays above the Leidenfrost point. This vapor layer has poor heat transfer characteristics but has the potential to reduce drag by acting as a buffer between the solid …
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The Application of Thin Film Ionic Self-assembled Multilayer (ISAM) Nanostructures in Electromechanical Bending Actuators and Micro-fabricated Gas Chromatography (uGC) Devices
Ionic self-assembled multilayer (ISAM) thin film nanostructures, including highly porous and conductive gold nanoparticles (GNP), and highly porous and thermally stable silica nanoparticles (SNP), were fabricated via the layer-by-layer (LbL) self-assembly technique. Their application in ionic …
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Nanoscale surface modification of wood veneers for adhesion
… of the surface can be performed using layer-by-layer (LbL) assembly, where the adsorption of polyelectrolytes or nanoparticles in sequential steps yields a multilayer film with a defined layer sequence on a given substrate. The objective of this study was to quantify adsorption of …
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Surface Optochemical Sensors
… sensors for studying cellular processes by investigating techniques to modify surface properties. The spectral characteristics of the modified surfaces and coatings are designed to show remarkable changes after interaction with analytes from biological fluids and cells. My studies focused …
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Mechanistic Study of DNA Delivery from Self-Assembled Nanolayered Films
… cellular barriers. Surfacemediated gene delivery bypasses systemic trafficking obstacles by localizing DNA release within the cellular microenvironment. Local delivery has several advantages including increased efficacy at the target site and reduced off-target effects. Layer-by-layer (LbL) …
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Systematic investigation of the effects of hydrophilic porosity on boiling heat transfer and critical heat flux
… on it. In particular, recent work carried out by O'Hanley demonstrated the separate effects of surface wettability, porosity, and roughness on CHF, and found that porous hydrophilic surface coatings provided the largest CHF increase, with a 50-60% enhancement over the base case. In the present …
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