Video Experimental Relacionado
Updated: Jul 11, 2026
08:40
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Realización experimental del nitruro de carbono sólido covalente.
Science (New York, N.Y.)
|July 16, 1993
Resumen
Los investigadores sintetizaron nuevas películas delgadas de carbono-nitrógeno (C-N) utilizando la ablación láser pulsada y una fuente de nitrógeno atómico. El material resultante muestra potencial para aplicaciones súper duras debido a su estructura única de beta-C(3) N(4).
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
- Deposición de película delgada.
Sus antecedentes:
- Los materiales de carbono-nitrógeno (C-N) son de interés para aplicaciones avanzadas.
- Las predicciones teóricas sugieren que el beta-C(3) N(4) podría ser un material superduro.
- La síntesis experimental de tales materiales sigue siendo un desafío.
Objetivo del estudio:
- Para sintetizar nuevos materiales de película delgada C-N.
- Para caracterizar la composición, la unión y la estructura de las películas sintetizadas.
- Investigar el potencial del material sintetizado para aplicaciones súper duras.
Principales métodos:
- La ablación láser pulsada de objetivos de grafito.
- Uso de una fuente de nitrógeno atómico intenso para la deposición de película.
- Rutherford espectrometría de retrodispersión para el análisis elemental.
- Espectroscopia de fotoelectrones para el análisis de enlaces químicos.
- Difracción de electrones para la determinación estructural.
Principales resultados:
- Las películas delgadas C-N se prepararon con éxito con un contenido de nitrógeno sintonizable de hasta el 40%.
- La retrodispersión de Rutherford confirmó una alta incorporación de nitrógeno.
- La espectroscopia de fotoelectrones indicó enlaces C-N covalentes no polarizados.
- La difracción de electrones identificó la estructura de la cristallita como beta-C(3) N(4).
- Los sólidos C-N sintetizados exhibieron robustez térmica y dureza.
Conclusiones:
- El estudio sintetizó experimentalmente beta-C(3) N(4), un material superduro teóricamente predicho.
- El método de síntesis ofrece control sobre el contenido de nitrógeno y las propiedades de la película.
- El nuevo material C-N es prometedor para futuras aplicaciones de investigación e ingeniería.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:18Network Covalent Solids
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...
01:29Covalent Bonds
When two atoms share electrons to complete their valence shells they create a covalent bond. An atom’s electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.A Covalent...
01:08Covalent Bonds
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.
02:54Molecular and Ionic Solids
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
01:24Solid–Solid Solutions
The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
03:10The Equilibrium Constant
Consider the oxidation of sulfur dioxide: