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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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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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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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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Copper shell networks in polymer composites for efficient thermal conduction.

Seunggun Yu1, Jang-Woo Lee, Tae Hee Han

  • 1Center for Materials Architecturing, Korea Institute of Science and Technology , Seoul 136-791, Republic of Korea.

ACS Applied Materials & Interfaces
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Summary
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Researchers developed advanced polymeric composites with copper (Cu) thin film networks for superior thermal management. This novel approach significantly enhances thermal and electrical conductivity in materials for electronic devices.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Effective thermal management is critical for the performance and reliability of modern electronic devices.
  • Developing advanced materials with enhanced thermal and electrical conductivity is an ongoing challenge.
  • Polymeric composites offer potential but often struggle with isotropic conductivity.

Purpose of the Study:

  • To develop a straightforward method for creating polymeric composites with enhanced isotropic thermal and electrical conductivity.
  • To investigate the properties of composites formed by metallized polymer beads with a unique 3D copper network structure.
  • To compare the performance of these novel composites against conventionally prepared composites.

Main Methods:

  • Copper (Cu) thin film metallization of polystyrene (PS) beads.
  • Hot press molding of Cu-plated PS beads to form 3D Cu shell-networks within a PS matrix.
  • Characterization of thermal and electrical conductivity of the resulting composites.

Main Results:

  • The 3D Cu shell-networks in the PS matrix exhibited isotropic and ideal conductive performance even at very low Cu content.
  • Compared to conventionally melt-mixed Cu beads/PS composites (23.0 vol % Cu), the novel composites showed a 60-fold increase in thermal conductivity.
  • Electrical conductivity was enhanced by 8 orders of magnitude in the novel PS composites with Cu shell networks.

Conclusions:

  • A straightforward and high-throughput strategy for fabricating isotropic thermal and electrical conductive polymeric composites was successfully demonstrated.
  • The unique 3D Cu shell-network structure is key to achieving superior conductivity in polymeric composites.
  • This method offers a promising route for developing advanced materials for thermal management applications.