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Videos de Conceptos Relacionados

Electron Behavior00:54

Electron Behavior

Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.Electrons Orbit the NucleusElectrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus...
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
VSEPR Theory02:37

VSEPR Theory

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...
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Electron Behavior01:09

Electron Behavior

Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Molecular Entanglement and Electrospinnability of Biopolymers
07:59

Molecular Entanglement and Electrospinnability of Biopolymers

Published on: September 3, 2014

Hacia la electrónica molecular con uniones moleculares de gran área.

Hylke B Akkerman1, Paul W M Blom, Dago M de Leeuw

  • 1Materials Science Centre, University of Groningen, Nijenborgh 4, NL-9747 AG, Groningen, The Netherlands.

Nature
|May 5, 2006
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para crear uniones electrónicas moleculares estables y reproducibles de hasta 100 micrómetros de ancho. Esta técnica supera las limitaciones anteriores, permitiendo conexiones de túneles moleculares a mayor escala para aplicaciones prácticas.

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Molecular Entanglement and Electrospinnability of Biopolymers
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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • La electrónica molecular es la electrónica molecular.

Sus antecedentes:

  • El transporte electrónico de una sola molécula es crucial para la electrónica molecular.
  • Las uniones de túneles moleculares existentes se enfrentan a desafíos en cuanto a fiabilidad, estabilidad y reproducibilidad.
  • Las monocapas autoensambladas (SAM) ofrecen potencial, pero están limitadas por cortes eléctricos en la fabricación.

Objetivo del estudio:

  • Desarrollar un método escalable y confiable para fabricar uniones electrónicas moleculares de gran diámetro.
  • Para superar las limitaciones de las técnicas existentes, tales como pequeños diámetros y pantalones cortos inducidos por la fabricación.
  • Para lograr altos rendimientos y una excelente estabilidad en las uniones de túneles moleculares.

Principales métodos:

  • Utilizando fotorresistentes con patrones litográficos para procesar las uniones moleculares dentro de agujeros definidos.
  • Introducción de una capa intermedia de polímero conductor entre el SAM y el electrodo de metal superior.
  • Fabricación de uniones moleculares con diámetros de hasta 100 micrómetros.

Principales resultados:

  • Se ha logrado un alto rendimiento de fabricación superior al 95% para las uniones moleculares.
  • Demostró una excelente estabilidad y reproducibilidad de las uniones fabricadas.
  • Conductividad obtenida por unidad de área comparable a los diodos de nanoporo de referencia.

Conclusiones:

  • El método desarrollado permite la fabricación de uniones moleculares a gran escala con alto rendimiento y confiabilidad.
  • La capa intermedia de polímero conductor evita efectivamente los cortocircuitos eléctricos, lo que permite diámetros de dispositivos más grandes.
  • Este enfoque rentable tiene el potencial de avanzar en la electrónica molecular práctica.