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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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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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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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Self-adaptive radiative cooling based on phase change materials.

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    This study introduces self-adaptive radiative cooling using phase change materials. The technology can switch cooling on and off based on ambient temperature, enabling efficient thermal management without external power.

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    Area of Science:

    • Materials Science
    • Thermodynamics
    • Nanotechnology
    • Photonics

    Background:

    • Radiative cooling leverages universal coldness as a thermodynamic resource for applications like passive building cooling and refrigeration.
    • Current radiative cooling technologies rely on static structures, limiting adaptive thermal management capabilities.
    • A need exists for self-adaptive radiative cooling systems that can dynamically adjust performance without external energy input.

    Purpose of the Study:

    • To introduce and demonstrate a novel concept of self-adaptive radiative cooling.
    • To design a photonic structure capable of on-demand radiative cooling.
    • To enable passive, temperature-triggered switching of radiative cooling functionalities.

    Main Methods:

    • Incorporation of phase change materials, specifically vanadium dioxide, into a photonic structure.
    • Design of a structure that exhibits tunable radiative properties based on ambient temperature.
    • Experimental validation of the adaptive 'on' and 'off' switching of radiative cooling.

    Main Results:

    • A self-adaptive photonic structure was successfully designed and conceptualized.
    • The structure demonstrates the ability to autonomously switch radiative cooling 'on' and 'off' in response to ambient temperature changes.
    • The system operates without requiring external energy input for switching, showcasing passive functionality.

    Conclusions:

    • The developed self-adaptive radiative cooling technology offers new functionalities beyond static systems.
    • This innovation holds significant potential for energy-efficient thermal management in buildings, vehicles, and textiles.
    • The findings pave the way for advanced, demand-responsive cooling solutions.