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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic...
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Heating and Cooling Curves02:44

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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El sobrecalentamiento del oro más allá del umbral de catástrofe de entropía previsto

Thomas G White1, Travis D Griffin2, Daniel Haden2

  • 1Department of Physics, University of Nevada, Reno, NV, USA. tgwhite@unr.edu.

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Los investigadores han desafiado experimentalmente las teorías

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Área de la Ciencia:

  • Ciencias de los materiales
  • La termodinámica
  • Física del estado sólido

Sus antecedentes:

  • La teoría de la "catástrofe de entropía" predice un límite superior para la estabilidad sólida.
  • Este límite es teóricamente alrededor de tres veces el punto de fusión.
  • Los acontecimientos desestabilizadores intermedios (catástrofes) impiden alcanzar este límite teórico.

Objetivo del estudio:

  • Para investigar experimentalmente el límite de estabilidad de los cristales sobrecalentados.
  • Para probar el umbral de la "catástrofe de entropía" en condiciones extremas.
  • Para explorar la dinámica de la fusión bajo calentamiento ultra rápido.

Principales métodos:

  • Utilizó técnicas de calentamiento ultrarrápido.
  • Se empleó dispersión de rayos X inelástica de alta resolución para rastrear la temperatura de la celosía.
  • Muestras de oro probadas experimentalmente bajo condiciones de temperatura extrema.

Principales resultados:

  • Las muestras de oro se calentaron a más de 14 veces su punto de fusión manteniendo la estructura cristalina.
  • El límite de sobrecalentamiento observado superó significativamente el umbral previsto de "catástrofe de entropía".
  • Las muestras no se expandieron en las muy cortas escalas de tiempo estudiadas, lo que difiere de las estimaciones anteriores.

Conclusiones:

  • Los resultados experimentales sugieren un límite sustancialmente mayor o potencialmente inexistente para el sobrecalentamiento en sólidos.
  • Las condiciones de calentamiento ultrarrápido y los efectos de escala de tiempo son factores críticos en la dinámica del sobrecalentamiento.
  • Este estudio proporciona nuevos conocimientos sobre los límites fundamentales de la estabilidad de los materiales sólidos.