Global ETD Search
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 28 for “"Covalent organic frameworks"”.
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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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Study of Porous Materials Incorporating Boronate Esters
<p> COF-18Å is one type of Covalent Organic Framework (COF) that incorporates self-assembling covalent bonded boronate esters as secondary building units to form a porous material. COF-18Å has the ability to store gases, high surface areas, good thermal stability, but is susceptible to hydrolysis. …
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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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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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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… govern the structural evolution of metal- and covalent-organic frameworks (MOFs and COFs) under dynamic conditions, and how particle breakage can be modeled efficiently for process design. Here, molecular dynamics simulations, microkinetic modeling, and population balance modeling are used to …
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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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Functionalized Polymeric Coatings for Enhanced Selective Removal of Ions in Electric-Field Driven Processes
… acid for the selective removal of copper and covalent organic frameworks as a newly emerging class of porous materials for water purification.
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ULTRA-LOW K DIELECTRIC MATERIALS WITH HIGH BREAKDOWN STRENGTH AND EXCELLENT MECHANICAL PROPERTIES
… become more ubiquitous. This thesis focuses on Covalent organic frameworks, a recently discovered two-dimensional polymer as a promising material for low permittivity material and its mechanical properties. Herein this report, we synthesize large area, ultra-thin, TpPa-1 2D polymer synthesized …
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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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Nanostrutture porfiriniche attraverso il self-assembly: approccio non-covalente e covalente
… quasi basato interamente su forze di natura non-covalente, tuttavia vale la pena considerare che due o più mattoni molecolari possono anche interagire con legami covalenti. Quest’ultimo è il caso del processo di polimerizzazione, in cui il self-assembly covalente porta ad estesi e macroscopici …
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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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Zirconium-based Metal-Organic Frameworks for Pleural Mesothelioma Therapy
… a new drug delivery system (DDS) based on metal-organic frameworks (MOFs) for mesothelioma therapy. MOFs are crystalline and porous materials formed by the self-assembling of metal ions and organic ligands. Zirconium (Zr)-based MOFs have emerged as promising candidates in biomedical applications …
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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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