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Videos de Conceptos Relacionados

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Video Experimental Relacionado

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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Autoensamblaje dinámico de objetos magnetizados de tamaño milimétrico que giran en una interfaz líquido-aire.

Grzybowski1, Stone, Whitesides

  • 1Harvard University, Department of Chemistry and Chemical Biology, Cambridge, Massachusetts 02138, USA.

Nature
|July 13, 2000
PubMed
Resumen

Los investigadores crearon patrones dinámicos utilizando discos magnéticos giratorios en una interfaz líquido-aire. Este sistema de autoensamblaje revela nuevos fenómenos de ordenamiento y ayuda a la comprensión de sistemas dinámicos complejos.

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Área de la Ciencia:

  • Física Física es la física de las cosas.
  • Ciencia de los materiales Ciencia de los materiales.
  • La dinámica de fluidos es la dinámica de fluidos.

Sus antecedentes:

  • La autoorganización y la formación de patrones son áreas clave de interés científico.
  • Los sistemas dinámicos, que disipan energía para crear orden, son cruciales para estudiar comportamientos complejos.
  • Las investigaciones anteriores se han centrado principalmente en estructuras estáticas autoensambladas.

Objetivo del estudio:

  • Para investigar la formación de patrones dinámicos en un sistema de discos magnéticos.
  • Explorar los mecanismos de autoensamblaje impulsados por los campos magnéticos y las interacciones hidrodinámicas.
  • Comprender nuevos fenómenos de ordenamiento en sistemas dinámicos.

Principales métodos:

  • Utilizando discos magnéticos de tamaño milimétrico en una interfaz líquido-aire.
  • Aplicación de un campo magnético generado por un imán permanente giratorio.
  • Observar el comportamiento del disco, incluido el giro, la atracción hacia el eje de rotación y la repulsión mutua debido al movimiento del fluido.

Principales resultados:

  • Los discos magnéticos sincronizaron su rotación con el imán.
  • Un equilibrio entre fuerzas atractivas y repulsivas condujo a la formación de diversos patrones dinámicos.
  • Se observaron varios tipos de pedidos no descritos anteriormente.

Conclusiones:

  • El sistema proporciona una nueva plataforma para estudiar el autoensamblaje dinámico.
  • Esta investigación ofrece información sobre los principios fundamentales que rigen los comportamientos complejos en los sistemas disipativos.
  • Los hallazgos pueden servir como base para probar teorías relacionadas con los vórtices en interacción.