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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Motor térmico molecular basado en un cristal elástico altamente flexible

Hinako Kato1, Yoji Horii1, Chiharu Watanabe1

  • 1Graduate School of Humanity and Science, Nara Women's University, Kitauoya-Higashimachi, Nara 630-8506, Japan.

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Resumen

Los investigadores desarrollaron nuevos cristales elásticos a partir de moléculas de porfirina dodeciladas. Estos cristales moleculares actúan como motores, convirtiendo el calor ambiental en oscilaciones mecánicas continuas, demostrando un nuevo método de conversión de energía.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería molecular
  • La termodinámica

Sus antecedentes:

  • Los materiales de accionamiento convierten la energía en trabajo mecánico, generalmente utilizando luz o productos químicos.
  • La activación térmica de fuentes ambientales es un desafío importante en la ciencia de los materiales.

Objetivo del estudio:

  • Introducir nuevos cristales elásticos con capacidad de accionamiento mediante la energía térmica ambiente.
  • Para demostrar un motor molecular que convierte los gradientes térmicos en movimiento mecánico.

Principales métodos:

  • Síntesis de moléculas de porfirina dodeciladas para formar cristales elásticos.
  • Instalación experimental con gradiente de temperatura (fuentes de calor de alta y baja temperatura).
  • Observación y medición de la deformación y oscilación de los cristales bajo tensión térmica.

Principales resultados:

  • Los cristales elásticos exhibieron una alta flexibilidad y una deformación significativa en respuesta a los cambios de temperatura.
  • Se observaron oscilaciones continuas, grandes y rápidas cuando los cristales fueron sometidos a una diferencia de temperatura.
  • Las oscilaciones persistieron durante más de 160 horas (3,9 millones de ciclos) bajo gradientes de temperatura mantenidos.

Conclusiones:

  • Este estudio presenta el primer cristal molecular que funciona como un motor alimentado por fuentes de temperatura ambiente.
  • El material desarrollado demuestra una eficiente extracción de energía cinética de gradientes térmicos estáticos.
  • Esto abre nuevas vías para el desarrollo de dispositivos autoalimentados que utilizan la energía térmica ambiental.