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Videos de Conceptos Relacionados

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Diamagnetism01:26

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Ordenamiento ferromagnético en sólidos superatómicos.

Chul-Ho Lee1, Lian Liu, Christopher Bejger

  • 1Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society
|November 8, 2014
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores demuestran que el ensamblaje de materiales en estado sólido a partir de grupos moleculares crea propiedades magnéticas predecibles. Modificar estos bloques de construcción superatómicos permite cambios controlados en el comportamiento ferromagnético colectivo.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química del estado sólido.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El ensamblaje de materiales en estado sólido a partir de grupos moleculares ofrece potencial para propiedades novedosas.
  • Los criterios clave para obtener beneficios incluyen síntesis reproducible, propiedades emergentes y relaciones estructura-propiedad predecibles.

Objetivo del estudio:

  • Demostrar la viabilidad de crear sólidos ensamblados en racimos con propiedades emergentes predecibles.
  • Para investigar el comportamiento magnético de los sólidos ensamblados a partir de racimos moleculares de telururo de níquel y fullerenos.
  • Mostrar que la modificación de los bloques de construcción superatómicos conduce a cambios predecibles en las propiedades magnéticas colectivas.

Principales métodos:

  • Se utilizaron mediciones de magnetometría y relajación del espín del muón.
  • Definición cristalográfica empleada de los sólidos superatómicos.
  • Sintetizó cantidades macroscópicas de materiales puros a partir de racimos moleculares de telururo de níquel y fullerenos.

Principales resultados:

  • Demostró una transición de fase ferromagnética en sólidos ensamblados en racimo a bajas temperaturas.
  • Confirmado que las propiedades observadas son emergentes y no simples promedios de subunidades constituyentes.
  • Demostró que las modificaciones racionales a los superátomos resultan en cambios predecibles en las propiedades magnéticas cooperativas.

Conclusiones:

  • Cumplió con los criterios para obtener beneficios significativos de los materiales de estado sólido ensamblados en racimo.
  • Estableció una plataforma para el diseño de materiales con propiedades magnéticas sintonizables a través de la ingeniería superatómica.
  • Abrió vías para el desarrollo de materiales funcionales avanzados basados en bloques de construcción moleculares.