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Related Concept Videos

Thermodynamic Potentials01:26

Thermodynamic Potentials

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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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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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Path Between Thermodynamics States01:21

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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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Temperature and Thermal Equilibrium01:11

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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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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Recent Progress of Two-Dimensional Thermoelectric Materials.

Delong Li1, Youning Gong1, Yuexing Chen2

  • 1Collaborative Innovation Centre for Optoelectronic Science & Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, People's Republic of China.

Nano-Micro Letters
|June 17, 2021
PubMed
Summary

Two-dimensional (2D) materials show promise for thermoelectric applications, converting heat to electricity. This review covers their development, properties, and future prospects for advanced thermoelectric devices.

Keywords:
Black phosphorus analoguePhotothermoelectric effectTin selenideTransition metal dichalcogenidesTwo-dimensional thermoelectric materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Thermoelectric generators (TEGs) offer direct heat-to-electricity conversion.
  • Significant advancements in thermoelectric material properties have been achieved.
  • Layered two-dimensional (2D) materials are emerging as high-performance thermoelectric candidates.

Purpose of the Study:

  • To provide a comprehensive review of 2D materials for thermoelectric applications.
  • To discuss theoretical simulations, experimental preparation, and nanodevice development.
  • To explore new applications and future prospects in the field of 2D thermoelectrics.

Main Methods:

  • Review of existing literature on 2D thermoelectric materials.
  • Analysis of theoretical simulations and experimental preparation techniques.
  • Examination of nanodevice architectures and emerging applications.

Main Results:

  • 2D materials like graphene, black phosphorus, dichalcogenides, IVA-VIA compounds, and MXenes exhibit unique properties suitable for thermoelectrics.
  • These materials enable diverse applications due to their electronic, mechanical, thermal, and optoelectronic characteristics.
  • The review covers advancements in device fabrication and performance.

Conclusions:

  • 2D materials represent a promising frontier for high-performance thermoelectric energy conversion.
  • Continued research into theoretical modeling, synthesis, and device engineering is crucial.
  • Addressing current challenges will unlock the full potential of 2D thermoelectric nanodevices.