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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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Una temperatura gravitacional efectiva para la sedimentación.

P N Segrè1, F Liu, P Umbanhowar

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. Phil.Segre@msfc.nasa.gov

Nature
|February 24, 2001
PubMed
Resumen

Las fluctuaciones de la energía gravitacional en las suspensiones de partículas actúan como una temperatura efectiva, unificando los comportamientos de baja y alta concentración de partículas. Este hallazgo aclara los complejos fenómenos de sedimentación en fluidos.

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Área de la Ciencia:

  • Dinámica de fluidos La dinámica de fluidos.
  • La mecánica estadística es la mecánica estadística.
  • La ciencia coloidal es la ciencia coloidal.

Sus antecedentes:

  • La sedimentación de partículas sólidas en fluidos es compleja y no se comprende completamente.
  • Las bajas concentraciones de partículas muestran correlaciones de velocidad de tipo turbulento debido a las interacciones hidrodinámicas.
  • Las altas concentraciones de partículas exhiben un comportamiento poco claro debido al flujo de retorno del fluido y las interacciones de partículas.

Objetivo del estudio:

  • Para dilucidar los fenómenos complejos en la sedimentación de partículas.
  • Para cerrar el entendimiento entre las fracciones de volumen de partículas bajas y altas (phi).
  • Para identificar un componente que falta para aplicar la mecánica estadística del equilibrio a las fluctuaciones de la sedimentación.

Principales métodos:

  • Fluctuaciones del número de partículas investigadas y su energía gravitacional.
  • Argumentos de escala aplicados a la viscosidad de la suspensión y la velocidad de sedimentación.
  • Efectos incorporados del empaquetado de partículas.

Principales resultados:

  • La energía gravitacional de las fluctuaciones del número de partículas sirve como una temperatura efectiva.
  • Se ha demostrado que el comportamiento de sedimentación de alto pH es equivalente al comportamiento de bajo pH bajo un escalamiento apropiado.
  • Los efectos de embalaje de partículas son cruciales para unificar las descripciones de sedimentación.

Conclusiones:

  • Se identifica un mecanismo de temperatura eficaz para la termalización en la sedimentación.
  • Se logra una descripción unificada de la sedimentación de partículas a través de diferentes fracciones de volumen.
  • El estudio proporciona una nueva perspectiva sobre la dinámica de partículas fluidas y la mecánica estadística.