Video Experimental Relacionado
Updated: Jul 4, 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
13.4K
Síntesis de desbloqueo de estructuras orgánicas covalentes tridimensionales policubanas oligoméricas poliédricas
Guan-Yu Qiao1, Xiaoxue Wang1, Xiao Li1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
Journal of the American Chemical Society
|January 25, 2024
Resumen
Desarrollamos nuevos marcos orgánicos covalentes 3D (COF) utilizando bloques de construcción de silsesquioxano oligomérico poliédrico (POSS). Estos COF basados en POSS presentan topologías únicas y funcionan como excelentes electrolitos sólidos.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- Nanotecnología
Sus antecedentes:
- La química reticular permite estructuras porosas para diversas aplicaciones.
- Los bloques de construcción basados en silsesquioxano oligomérico poliédrico (POSS) ofrecen características inorgánicas únicas para crear marcos orgánicos covalentes (COF).
- La flexibilidad de las moléculas POSS de tipo cubano presenta desafíos en la construcción de COF 3D estables.
Objetivo del estudio:
- Desarrollar nuevas estructuras orgánicas covalentes 3D cristalinas (COF) utilizando bloques de construcción de silsesquioxano oligomérico poliédrico (POSS).
- Para superar los desafíos planteados por la flexibilidad de las moléculas POSS en la construcción del marco.
- Explorar el potencial de estos nuevos COF en aplicaciones como los electrolitos sólidos.
Principales métodos:
- COFs 3D sintetizados mediante el enlace de núcleos POSS con enlaces aromáticos rígidos.
- Se utilizaron métodos experimentales y teóricos para confirmar la formación y la estructura de los COF basados en POSS.
- Caracterizó las propiedades de las redes híbridas resultantes, incluida la superficie y la estabilidad térmica.
Principales resultados:
- Desarrolló con éxito COFs 3D cristalinos con topologías "the" y scu sin precedentes.
- Los FOC de policubano resultantes presentan grandes superficies y una excelente estabilidad térmica.
- Se ha demostrado una alta conductividad iónica (1,23 × 10−4 S cm−1) y un número de transferencia de iones de litio (0,86) para aplicaciones de electrolitos sólidos.
Conclusiones:
- Este trabajo presenta una nueva estrategia para crear COFs 3D ordenados con motivos flexibles.
- Los FOC basados en POSS desarrollados ofrecen una plataforma prometedora para materiales avanzados, particularmente como electrolitos sólidos.
- Enriquece las topologías conocidas de los COF 3D y proporciona una vía para el diseño futuro del marco.
Videos de Conceptos Relacionados
01:08Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
02:18Network Covalent Solids
13.5K
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...
13.5K
01:00Characteristics and Nomenclature of Homopolymers
3.0K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.0K
02:37Metallic Solids
18.4K
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....
18.4K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.3K
01:21Polymer Classification: Crystallinity
2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K