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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...
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
Energy Bands in Solids01:01

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Ag(9) cúmulo cuántico a través de una ruta de estado sólido.

Thumu Udaya B Rao1, Bodappa Nataraju, Thalappil Pradeep

  • 1DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai 600 036, India.

Journal of the American Chemical Society
|November 2, 2010
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron un grupo de plata estable, Ag ((9) ((H ((2) MSA) ((7), utilizando una ruta de estado sólido. Este método produce racimos puros con propiedades ópticas únicas, importantes para la investigación de racimos.

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Área de la Ciencia:

  • Nanotecnología La nanotecnología es la nanotecnología.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química Inorgánica La Química Inorgánica es la química inorgánica.

Sus antecedentes:

  • Los cúmulos de plata están ganando atención por sus propiedades ópticas y electrónicas únicas.
  • La síntesis de grupos de plata puros y bien caracterizados en cantidades macroscópicas sigue siendo un desafío.
  • Comprender la estabilidad y la cinética de descomposición de los cúmulos de plata es crucial para sus aplicaciones.

Objetivo del estudio:

  • Desarrollar una síntesis escalable para los clústeres de plata con la composición Ag ((9) ((H ((2) MSA)) (7).
  • Para caracterizar los grupos sintetizados a fondo utilizando diversas técnicas espectroscópicas y microscópicas.
  • Para investigar la estabilidad y el comportamiento de descomposición de los cúmulos de plata.

Principales métodos:

  • La ruta de síntesis del estado sólido para los racimos de Ag{9) H{2) MSA{7).
  • Purificación mediante electroforesis con gel de poliacrilamida (PAGE).
  • Caracterización a través de UV-vis, FTIR, luminiscencia, RMN, TEM, XPS, XRD, TG, SEM / EDAX, análisis elemental y ESI.

Principales resultados:

  • Se han sintetizado con éxito cantidades macroscópicas de Ag ((9)) (((H ((2)) MSA) ((7) casi puros.
  • La ruta del estado sólido minimizó la contaminación por nanopartículas.
  • El cúmulo exhibió perfiles de absorción característicos similares a los cúmulos de oro y luminiscencia con un rendimiento cuántico de 8 × 10 (−3) a 5 °C.
  • La descomposición en agua siguió la cinética de primer orden, pero se estabilizó en mezclas de disolventes y en estado sólido.

Conclusiones:

  • La ruta del estado sólido es eficaz para sintetizar aglomerados de Ag ((9) puro.
  • Los clústeres de plata sintetizados poseen propiedades relevantes para la investigación de clústeres y aplicaciones potenciales.
  • La estabilidad se puede mejorar en entornos específicos, ampliando su utilidad.