A5070353962- Covalent Organic Framework Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Luminescence and Fluorescent Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Supercapacitor Materials and Fabrication
- Advanced Photocatalysis Techniques
- Microbial Fuel Cells and Bioremediation
- Electrospun Nanofibers in Biomedical Applications
- Advanced battery technologies research
- Graphene research and applications
- MXene and MAX Phase Materials
- Insect Pest Control Strategies
- Chemical Synthesis and Reactions
- Neurobiology and Insect Physiology Research
- biodegradable polymer synthesis and properties
- Plant and animal studies
University of Peradeniya
2024
General Sir John Kotelawala Defence University
2021-2023
Rice University
2020-2023
The University of Texas at Dallas
2016-2021
University of Dallas
2020
The University of Texas at Austin
2016
A crystalline microporous hydrogen-bonded cross-linked organic framework has been developed through covalent photo-cross-linking of molecular monomers that are assembled in a state. The elastic expands its void space to adsorb iodine rapidly with high uptake capacity an aqueous environment as well recovering form after the release iodine.
We report an azine linked covalent organic framework based on hexaphenylbenzene monomer functionalized with aldehyde groups (“HEX-COF 1”, avg. pore size = 1 nm, surface area >1200 m<sup>2</sup> g<sup>−1</sup>, sorption capability at 273 K, atm 20 wt% for CO<sup>2</sup> and 2.3 CH<sub>4</sub>).
We report the synthesis and characterization of a new class 2D-covalent organic frameworks, called COFamides, whose layers are held together by amide hydrogen bonds. To accomplish this, we have designed monomers with nonplanar structure that arises from steric crowding, forcing side groups out plane COF sheets orienting bonds between layers. The presence these provides significant structural stabilization as demonstrated comparison to control structures lack bonding capability, resulting in...
Two-dimensional covalent organic frameworks (2D-COFs) are a class of crystalline porous polymers that consist covalently linked, two-dimensional sheets can stack together through noncovalent interactions. Here we report the synthesis novel COF, called PyCOFamide, which has an experimentally observed pore size is greater than 6 nm in diameter. This among largest reported to date for 2D-COF. PyCOFamide exhibits permanent porosity and high crystallinity as evidenced by nitrogen adsorption,...
Here, we report a structure-function study of imine covalent organic frameworks (COFs) comparing series novel fluorine-containing monomers to their non-fluorinated analogues. We found that the produced 2D-COFs with not only greatly improved surface areas (over 2000 m2 g-1 compared 760 for analogue), but also crystallinity and larger, more defined pore diameters. then studied formation these COFs under varying reaction times temperatures obtain greater insight into mechanism formation.
The development of economical and versatile catalysts is both technological fundamental interest in the synthesis COFs. Imine COFs are a widely investigated class commonly synthesized via Schiff base reaction that requires use acetic acid, elevated temperatures, reduced pressure, long periods. Here, we present group 14–15 metal halides as general low-cost for imine catalytic activity lead, antimony, bismuth proved by successful series with varying pore sizes structural stability. Synthesis...
We report the synthesis of one new boronate ester-based covalent organic framework (COF) and two polymers (COPs) made with fluoranthene-containing monomers hexahydroxytriphenylene. The structure monomer heavily influences whether this material forms a highly ordered mesoporous or an amorphous, microporous (COP). fluoranthene was carried out using divergent strategy that allows for systematic structural variation ability to conduct careful structure–function study. found small variations in...
Hierarchical porous carbons (HPCs) hold great promise in energy-related applications owing to their excellent chemical stability and well-developed structures. Attention has been drawn toward developing new synthetic strategies precursor materials that permit greater control over composition, size, morphology, pore structure. There is a growing trend of employing metal-organic frameworks (MOFs) as HPC precursors highly customizable characteristics favor syntheses. In this article, we report...
The integration of covalent organic frameworks (COFs) with inorganic materials provides opportunities to develop a new class composite high surface areas and novel functionalities relevant photocatalysis, chemical adsorption, magnetic resonance imaging. However, current methods for the preparation COF-based composites require challenging, multistep synthetic protocols. Herein, we report one-pot synthesis approach using wide range metal oxides catalyze highly crystalline porous COFs. We found...
Herein we report a combined experimental and computational study on the effect of fluorine atom incorporation materials properties azine-linked COFs.
Two-dimensional (2D) rigid polymers provide an opportunity to translate the high-strength, high-modulus mechanical performance of classic rigid-rod 1D across a plane by extending covalent bonding into two dimensions while simultaneously reducing density due microporosity structural design. Thus far, this potential has remained elusive because challenge producing high-quality 2D polymer thin films, particularly those with irreversible, benzazole linkages. Here, we present facile two-step...
Covalent Organic Frameworks (COFs) are crystalline, porous organic materials. Recent studies have demonstrated novel processing strategies for COFs to form adaptable architectures, but these focused primarily on imine-linked COFs. This work presents a new synthesis and route produce crystalline hydrazone-linked COF gels aerogels with hierarchical porosity. The method was implemented series of different alkyl side-chain substituents, achieving control the hydrophilicity final aerogel....
Despite having an inherently low surface area upon carbonization, polyacrylonitrile (PAN) remains one of the more widely studied precursor polymers for making high-performance carbon fibers (CFs) supercapacitors because its electrospinnability and high yield. Copolymerization with vinylimidazole (VIM) or acidic monomers such as itaconic acid (IA) comprises attractive approach to modify properties PAN-based enhance their electrochemical performance. In this study, a terpolymer,...
Supercritical carbon dioxide (scCO2) activation provides milder conditions to process covalent organic frameworks (COFs) without compromising their crystallinity and porosity. To this end, three hydrazone COFs (TFPB-DHz COF, TFPT-DHz Py-DHz COF) were synthesized with a terephthaloyl dihydrazide linker (DHz) which has no substituents. date, the synthesis of narrow range alkoxy linkers not been possible. The scCO2-activated hydrazone-linked in study crystalline had high surface areas (surface...
Hierarchical porous carbons (HPCs) hold great promise in energy-related applications owing to their excellent chemical stability and well-developed structures. Attention has been drawn toward developing new synthetic strategies precursor materials that permit greater control over composition, size, morphology, pore structure. There is a growing trend of employing metal-organic frameworks (MOFs) as HPC precursors highly customizable characteristics favor syntheses. In this article, we report...
ABSTRACT:Hierarchical porous carbons (HPCs) hold great promise in energy-related applications owing to their excellent chemical stability and well-developed structures. Attention has been drawn toward developing new synthetic strategies precursor materials that permit greater control over composition, size, morphology, pore structure. There is a growing trend of employing metal-organic frameworks (MOFs) as HPC precursors highly customizable characteristics favor syntheses. In this article,...
Hierarchical porous carbons (HPCs) hold great promise in energy-related applications owing to their excellent chemical stability and well-developed structures. Attention has been drawn toward developing new synthetic strategies precursor materials that permit greater control over composition, size, morphology, pore structure. There is a growing trend of employing metal-organic frameworks (MOFs) as HPC precursors highly customizable characteristics favor syntheses. In this article, we report...
ABSTRACT:Hierarchical porous carbons (HPCs) hold great promise in energy-related applications owing to their excellent chemical stability and well-developed structures. Attention has been drawn toward developing new synthetic strategies precursor materials that permit greater control over composition, size, morphology, pore structure. There is a growing trend of employing metal-organic frameworks (MOFs) as HPC precursors highly customizable characteristics favor syntheses. In this article,...
We report the synthesis and characterization of a new class 2D-covalent organic frameworks, called COFamides, whose layers are held together by amide hydrogen bonds. To accomplish this, we have designed monomers with non-planar structure that arises from steric crowding, forcing side groups out plane COF sheets orienting bonds between layers. The presence these provides significant structural stabilization as demonstrated comparison to control structures lack bonding capability, resulting in...