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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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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?
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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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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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Updated: May 31, 2025

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Defects vibrations engineering for enhancing interfacial thermal transport in polymer composites.

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Defects in polymer composites, like graphite oxide in polyvinyl alcohol, enhance thermal conductivity by improving vibrational coupling at interfaces. This finding is crucial for developing advanced thermal management materials.

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Area of Science:

  • Materials Science
  • Polymer Composites
  • Thermal Conductivity

Background:

  • Understanding thermal transport mechanisms is key to enhancing thermal conductivity in polymer composites.
  • Systematic experimental data on thermal transport in these materials remain limited despite extensive simulations.

Purpose of the Study:

  • To investigate thermal transport mechanisms in polymer composites using perfect and defective fillers.
  • To elucidate the role of filler defects in influencing thermal conductivity.

Main Methods:

  • Fabrication of polyvinyl alcohol (PVA) based polymer composites with graphite (perfect filler) and graphite oxide (defective filler).
  • Experimental measurement of thermal conductivity.
  • Neutron scattering, quantum mechanical modeling, and molecular dynamics simulations.

Main Results:

  • PVA/defective filler composites exhibited higher thermal conductivity (~1.38 W m⁻¹ K⁻¹) compared to PVA/perfect filler composites (~0.86 W m⁻¹ K⁻¹).
  • Defects in fillers were found to lower the filler's intrinsic thermal conductivity but enhance composite thermal conductivity.
  • Enhanced vibrational coupling at PVA/defective filler interfaces was identified as the primary mechanism.

Conclusions:

  • Defects in fillers can improve thermal transport in polymer composites by enhancing interfacial vibrational coupling.
  • This study provides critical insights into designing polymer composites with superior thermal performance.