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Phase Transitions02:31

Phase Transitions

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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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Phase Transitions: Sublimation and Deposition02:33

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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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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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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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Phase Transitions: Vaporization and Condensation02:39

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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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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Gate-controlled VO2 phase transition for high-performance smart windows.

Shi Chen1, Zhaowu Wang2,3, Hui Ren1

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China.

Science Advances
|April 2, 2019
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Summary
This summary is machine-generated.

Researchers developed a new method to control vanadium dioxide (VO2) smart windows using electric fields. This breakthrough enhances solar energy regulation and visible light transmittance, making energy-saving windows more practical.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Storage

Background:

  • Vanadium dioxide (VO2) exhibits infrared thermochromism due to its metal-insulator transition (MIT), making it suitable for energy-saving smart windows.
  • Practical applications of VO2 smart windows are hindered by a high critical transition temperature (~68°C), low luminous transmittance (<60%), and limited solar energy regulation (<15%).

Purpose of the Study:

  • To develop a reversible and nonvolatile electric field control method for the MIT in monoclinic VO2 films.
  • To enhance the performance of VO2-based smart windows for improved energy efficiency.

Main Methods:

  • Utilized a solid electrolyte layer for gating treatment to modulate hydrogen insertion/extraction in the VO2 lattice at room temperature.
  • Achieved tristate phase transitions in VO2 by controlling hydrogen doping levels, enabling tunable light transmittance.

Main Results:

  • Demonstrated electric field control of VO2's MIT at room temperature.
  • Achieved a solar energy regulation ability of up to 26.5% with 70.8% visible luminous transmittance.
  • Exceeded previous performance records and theoretical limits for traditional VO2 smart windows.

Conclusions:

  • The developed electric field control method offers a viable pathway for practical, energy-saving VO2 smart windows.
  • The tristate phase transitions induced by hydrogen doping significantly improve solar energy regulation and luminous transmittance.
  • This research paves the way for next-generation smart window technologies with superior energy efficiency.