Video Experimental Relacionado
Updated: Jun 10, 2025
08:42
Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
Published on: July 10, 2017
13.3K
Marco orgánico covalente 3D monocristalino con una superficie específica y una capacidad de almacenamiento de gases
Baoqiu Yu1,2, Yu Tao3, Xuan Yao3
1Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China.
Journal of the American Chemical Society
|October 11, 2024
Resumen
Dos nuevas estructuras orgánicas covalentes monocristalinas (COF) presentan superficies y capacidades de almacenamiento de metano récord. Estos materiales avanzados ofrecen información sobre la ingeniería de poros para una absorción eficiente de gases.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- Nanotecnología
Sus antecedentes:
- Los marcos orgánicos covalentes monocristalinos (COF) son cruciales para comprender sus propiedades intrínsecas.
- El desarrollo de COF con estructuras de poro adaptadas es esencial para aplicaciones como el almacenamiento de gas.
Objetivo del estudio:
- Sintetizar y caracterizar dos nuevos COFs 3D monocristalinos.
- Para investigar su microporosidad y sus capacidades de almacenamiento de metano.
Principales métodos:
- Reacciones de condensación utilizando precursores específicos de aminas y aldehídos.
- Difracción de electrones 3D de un solo cristal y difracción de rayos X de sincrotrón para el análisis estructural.
- Mediciones de la absorción de nitrógeno para la determinación de la superficie.
Principales resultados:
- Se han sintetizado con éxito dos COF 3D monocristalinos: TAM-TFPB-COF y TAPB-TFS-COF.
- Determinación de la estructura de la red de dia-b con tres interpenetraciones de TAM-TFPB-COF.
- Las superficies de Brunauer-Emmett-Teller (BET) alcanzaron un nivel récord (3533 y 4107 m2 g−1).
- Capacidades de absorción de metano demostradas hasta el 28,9% en peso a 200 bar.
Conclusiones:
- El estudio presenta nuevos COF monocristalinos con una microporosidad excepcional.
- La ingeniería atómica ajustó con éxito las estructuras microporosas permanentes para mejorar el almacenamiento de metano.
- Estos hallazgos allanan el camino para materiales avanzados en aplicaciones de almacenamiento de gas.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:18Network Covalent Solids
13.4K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.4K
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.7K
02:37Metallic Solids
18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K