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Mechanism of heat transfer01:19

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
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Mechanisms of Heat Transfer II01:20

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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Mechanisms of Heat Transfer I01:14

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Improving thermoelectric performance by constructing a SnTe/ZnO core-shell structure.

Song Li1, Jingwen Zhang1,2, Dawei Liu1

  • 1School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China zjwhfut18205614071@163.com zjiuxing@hfut.edu.cn.

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|September 12, 2022
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Summary
This summary is machine-generated.

Tin telluride (SnTe) shows promise as an eco-friendly thermoelectric material. This study enhances SnTe

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Tin telluride (SnTe) is an emerging intermediate-temperature thermoelectric material.
  • Its environmental friendliness makes it attractive for energy conversion applications.

Purpose of the Study:

  • To enhance the thermoelectric performance of SnTe by creating a SnTe/ZnO core-shell structure.
  • To investigate the effects of ZnO nanostructures and Cu2Te alloying on thermoelectric properties.

Main Methods:

  • Facile hydrothermal synthesis to create SnTe/ZnO core-shell structures.
  • Spark plasma sintering to convert ZnO nanosheets into nano-dots.
  • Cu2Te alloying to introduce point defects.

Main Results:

  • Successful fabrication of SnTe/ZnO core-shell structures with ZnO nano-dots after sintering.
  • Improved Seebeck coefficient due to energy barriers at the SnTe/ZnO interfaces.
  • Reduced lattice thermal conductivity through phonon scattering by ZnO interfaces and point defects.
  • Achieved a peak figure of merit (ZT) of 0.94 at 823 K for SnTe(Cu2Te)0.06-1.5% ZnO.

Conclusions:

  • The SnTe/ZnO core-shell structure effectively optimizes thermoelectric performance.
  • Synergistic enhancement of electrical and thermal transport properties leads to high ZT values.
  • This approach offers a new strategy for developing efficient thermoelectric materials.