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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 17 of 17 for “"Covalent Organic Frameworks (COFs)"”.
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The synthesis and characterization of porous, conductive, and ordered materials
… precursors with boronic acids to prepare covalent-organic frameworks (COFs) possessing boroxole linkages. After preparing the precursors, several different reaction conditions were attempted, but the desired COFs proved elusive. The second class of materials was tetrathiafulvalene-based …
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Design, Synthesis, Characterization, and Evaluation of Boronate Ester-Linked Porous Materials: Covalent Organic Frameworks and Polymers of Intrinsic Microporosity
… with evaluation of a series of alkylated covalent organic frameworks (COFs), insight into the influence of alkylation in the hexagonal COF pores on the hydrolytic stability of the B-O linkages led to development of a family of hybrid COFs (HCOFs). These HCOFs were made by incorporating a …
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Acetylene Functionalized Photocatalytic COFs for PFAS Adsorption and Degradation
Covalent organic frameworks (COFs) are of deep interest in various applications due to their highly tunable architectures and porosities. COFs used as photocatalysts have great potential because they usually possess high surface areas for adsorption, tunable pore and surface functionalities, and …
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The Chemistry of Metal Oxyhydroxides and their 3D Porous Hybrid Materials for the Capture, Transport and Degradation of Toxic Chemicals
… 3-dimensional porous materials, such as metal organic frameworks (MOFs), and covalent organic frameworks (COFs), and their applications for gas capture and degradation, especially for toxic gases and chemical warfare agent simulants. We report and verify that the active sites in UiO-67 MOFs are …
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Synthesis and Characterization of Nanoporous Copolymers with Potential Gas Storage Applications
Nanoporous organic polymers, including hypercrosslinked polymers (HCPs), covalent organic frameworks (COFs), polymers of intrinsic microporosity (PIMs), and conjugated microporous polymers (CMPs) etc., are considered good candidates for potential gas storage and gas separation applications. …
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Modeling Nanofiltration Separation Mechanisms in Covalent Organic Framework Membranes
… challenge these goals. In this work, we apply covalent organic frameworks (COFs) as model NF membrane materials to demonstrate control over partitioning and transport mechanisms. We experimentally isolate and quantify steric and non-steric contributions to solute partitioning and transport in …
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Selective transport properties in nanostructured materials
… nanostructures, our interest has extended to covalent organic frameworks (COFs) and their desalination properties. Through classical calculations, we show that COF membranes can achieve high salt rejection rate while enhancing the water permeability up to two to three orders of magnitude …
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From molecular Au(I) complexes to subnanoclusters and nanoparticles: study of the influence of secondary interactions in (photo)catalytic systems
… stabilized on carbon-based matrixes, such as covalent organic frameworks (COFs). Thorough the in-situ reduction of organometallic gold(I) complexes, such as [Au(C6F5)(tht)], the growth and stabilization of nanoparticles approximately 2-4 nm in size within the cavities of the semiconductor …
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Development and physicochemical characterization of thin-film composite nanofiltration membranes with covalent organic framework active layers
… process for removing pathogens along with organic and inorganic contaminants. Despite their advantages, technical advances, and the development of novel membrane materials in recent decades, the relatively high cost of energy required for membrane processes and operational problems …
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Building and Exploring Databases of Porous Materials for Adsorption Applications
… customisable structures. Among them are metal-organic frameworks (MOFs), covalent organic frameworks (COFs), metal-organic cages (MOCs) and organic cages (OCs). MOFs are coordination networks assembled from organic ligands and metal clusters, while COFs are their fully organic equivalents. MOCs …
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Computational Study of Metal-Organic Frameworks for Gas Adsorption Applications
Metal-organic frameworks (MOFs) are among the most promising materials for gas adsorption applications because of their ultrahigh surface areas (up to 8,000 m² g¯¹) and high porosity. Their self-assembly nature of metal ions or clusters and organic ligands allow for high tuneability and a large …
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BRIDGING EXPERIMENT AND THEORY IN PORPHYRIN CHEMISTRY: DEVELOPING MATERIALS FOR SENSING, OPTICAL, AND CATALYTIC TECHNOLOGIES
… motivated the development of Rh–porphyrin-based covalent organic frameworks (COFs) as robust heterogeneous catalytic architectures featuring ordered porosity and accessible active centers. By incorporating Rh–porphyrin units into imine- and triazole-linked COFs, we created modular catalytic …
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Quantum Chemical Studies for the Engineering of Metal Organic Materials
<p>Metal Organic Materials (MOM) are composed of transition metal ions as connectors and organic ligands as linkers. MOMs have been found to have high porosity, catalytic, and optical properties. Here we study the gas adsorption, color change, and non-linear optical properties of MOMs. These …
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Fundamental Understanding of Palladium-Based Catalysts: From Pyrene-Based COFs to Size-Controlled Bimetallic Nanostructures
… free energy and distinct chemical behavior. Covalent organic frameworks (COFs), a class of porous and crystalline materials composed of light elements (H, B, C, N, and O), are attractive supports for SACs due to their designable periodic structures and stable covalent bonding. These …
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Investigation of Charge Transfer in Metal-Organic Frameworks for Electrochemical Applications
… capability for efficient mass transport. Metal-organic frameworks (MOFs) are a novel class of porous coordination polymers constructed with organic linkers connected by inorganic nodes. Their extraordinarily high surface area, permanent pores/channels, good thermal and chemical stabilities have …
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Novel covalent organic framework (COF) thin-film composite nanofiltration membrane for effective removal of organic compounds from petroleum produced water
… are adequate technologies to remove the bulk of organic matter in produced water, the removal of small organic matter remains a challenge. A novel thin-film composite nanofiltration membrane with an active layer made with a covalent organic framework (COF) developed in the early phases of this …
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Microporous materials fabricated from discrete molecular cages
… open pore spaces in solid materials, as porous frameworks with open void spaces are often higher in energy relative to their more dense structural counterparts. Nonetheless, during the last few decades, technology has advanced such that scientists have significant control over the size, shape, …