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Atomic Orbitals02:44

Atomic Orbitals

An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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VSEPR Theory02:37

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Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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First Law: Particles in One-dimensional Equilibrium01:10

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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If we...
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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about the...

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Polimorfos bidimensionales de boro para la plasmónica de rango visible: una exploración de los primeros principios

Yuefei Huang1, Sharmila N Shirodkar1, Boris I Yakobson1

  • 1Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.

Journal of the American Chemical Society
|November 2, 2017
PubMed
Resumen
Este resumen es generado por máquina.

El borofeno, un nuevo material 2D, exhibe propiedades plasmónicas únicas debido a su alta concentración de electrones. Estos plasmones operan a altas frecuencias, incluso en el espectro visible, sin necesidad de dopaje.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Física de la materia condensada
  • Nanotecnología

Sus antecedentes:

  • Los materiales bidimensionales (2D) ofrecen propiedades electrónicas únicas.
  • El borofeno, un alótropo de boro 2D recientemente descubierto, exhibe características metálicas.
  • La alta concentración de portadores de carga libre en el borofeno sugiere el potencial de comportamiento plasmónico.

Objetivo del estudio:

  • Para investigar las propiedades plasmónicas del borofeno.
  • Para calcular las frecuencias plasmónicas y las relaciones de dispersión en las estructuras de borofeno.
  • Explorar el potencial del borofeno para aplicaciones nanoplasmónicas.

Principales métodos:

  • Cálculos de respuesta lineal desde el principio de la función dieléctrica.
  • Cálculo de las frecuencias plasmónicas (ω) para las estructuras de borofeno seleccionadas.
  • Análisis de la dispersión plasmónica en el límite del vector de ondas pequeñas (q).

Principales resultados:

  • Los electrones de borofeno se comportan como un gas de electrones en 2D.
  • La dispersión de plasmones sigue la dependencia ω √q predicha.
  • Las frecuencias de plasmón no amortiguadas se extienden a las regiones cercanas al infrarrojo y visibles.

Conclusiones:

  • El borofeno es el primer material que soporta plasmones 2D a altas frecuencias sin dopaje.
  • La sintonizabilidad de la metalicidad y la anisotropía del borofeno permite un comportamiento de plasmón de ajuste fino.
  • El borofeno muestra una promesa significativa para las aplicaciones en nanoplasmónicos.