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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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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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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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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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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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Hydrogenated carbon nanotube-based spin caloritronics.

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Physical Chemistry Chemical Physics : PCCP
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Partially hydrogenated carbon nanotubes (CNTs) exhibit magnetism and the spin-Seebeck effect. An odd-even effect allows for potential spin-Seebeck diode applications in these novel carbon-based spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Spin caloritronics merges thermoelectric and spintronic phenomena.
  • Graphene exhibits spin caloritronic properties, but research on carbon nanotubes (CNTs) is limited.

Purpose of the Study:

  • Investigate the spin-Seebeck effect (SSE) in partially hydrogenated carbon nanotubes.
  • Explore the potential of hydrogenated CNTs for spin caloritronic applications.

Main Methods:

  • Utilized first-principles calculations to simulate and analyze hydrogenated CNTs.
  • Examined the magnetic properties and spin-Seebeck effect in these structures.

Main Results:

  • Linear hydrogenation induces magnetism and the SSE in CNTs.
  • An odd-even effect in the SSE was observed, enabling diode-like behavior.
  • The SSE is attributed to unique band structures resulting from hydrogenation-induced division of the nanotube.

Conclusions:

  • Partially hydrogenated CNTs are promising for spin caloritronic devices.
  • The observed odd-even SSE effect offers potential for diode applications.
  • The findings are extendable to CNTs of various diameters, highlighting broad application potential.