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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Near-Wavelength Sculpturing-Evoked Radiative Cooling.

Wenzhuo Li1,2, Hetao Guo1,2, Wang Zhang3

  • 1College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary
This summary is machine-generated.

This study introduces a novel laser-based method for powerful radiative cooling in high-temperature environments. The technique achieves significant temperature reduction, offering a promising solution for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Radiative cooling offers energy-efficient temperature regulation.
  • Existing methods face challenges in high-temperature environments.
  • Inspiration from nature, like Sahara silver ants, drives innovation.

Purpose of the Study:

  • To develop a robust radiative cooling technique for high-temperature applications.
  • To leverage surface plasmon resonance for enhanced thermal emission.
  • To create a cost-effective and energy-efficient cooling solution.

Main Methods:

  • Direct femtosecond laser sculpting of microgrooves on substrates.
  • Tuning microgroove dimensions (depth, width) to control surface plasmon resonance (SPR).
  • Utilizing SPR to enhance mid-infrared emittance through the atmospheric transparency window.

Main Results:

  • Achieved a temperature drop of up to 24 °C at approximately 419 °C.
  • Demonstrated functional stability at temperatures exceeding 400 °C without additive layers.
  • Method is lightweight and maintains performance under harsh conditions.

Conclusions:

  • Femtosecond laser sculpting of microgrooves is an effective method for high-temperature radiative cooling.
  • The technology enables significant passive cooling in extreme thermal environments.
  • This approach opens new possibilities for advanced thermal management in various applications.