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Se midieron las fuerzas repulsivas de largo alcance de Casimir-Lifshitz.

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Los investigadores demostraron fuerzas repulsivas de Casimir-Lifshitz, cambiando las interacciones de atractivas a repulsivas entre los materiales. Este descubrimiento abre posibilidades para la levitación cuántica y nuevos dispositivos a nanoescala.

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Área de la Ciencia:

  • Física Física es la física de las cosas.
  • La mecánica cuántica es la mecánica cuántica.
  • Ciencias de la superficie Ciencias de la superficie.

Sus antecedentes:

  • Las fluctuaciones cuánticas generan fuerzas intermoleculares, incluidas las fuerzas de van der Waals a distancias cortas.
  • A mayores distancias, estas fuerzas exhiben efectos de retardo debido a la velocidad finita de la luz, como se describe en las teorías de Casimir, Polder y Lifshitz.
  • Anteriormente, solo se habían medido experimentalmente las fuerzas atractivas de Casimir-Lifshitz entre cuerpos materiales.

Objetivo del estudio:

  • Para demostrar experimentalmente la posibilidad de fuerzas repulsivas de Casimir-Lifshitz.
  • Investigar la influencia de la elección del material y del fluido de inmersión en el signo y la magnitud de estas fuerzas.
  • Explorar las aplicaciones potenciales de las fuerzas sintonizables de Casimir-Lifshitz.

Principales métodos:

  • Medición experimental de las fuerzas entre cuerpos macroscópicos sumergidos en un fluido.
  • Variación sistemática de los materiales que interactúan y las separaciones superficiales.
  • Comparación de los resultados experimentales con las predicciones teóricas de las interacciones Casimir-Lifshitz.

Principales resultados:

  • Demostró con éxito las fuerzas repulsivas de Casimir-Lifshitz mediante la selección de materiales adecuados que interactúan.
  • Se observó que las fuerzas repulsivas son más débiles que las fuerzas atractivas para separaciones similares.
  • Se confirmó que la magnitud de las fuerzas de atracción y repulsión aumenta a medida que disminuye la separación de la superficie.

Conclusiones:

  • El signo de las fuerzas de Casimir-Lifshitz puede ser controlado, permitiendo interacciones repulsivas.
  • Las fuerzas repulsivas de Casimir-Lifshitz ofrecen potencial para la levitación cuántica en fluidos.
  • Este trabajo allana el camino para dispositivos conmutables a nanoescala con fricción estática ultra baja.