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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Radiative Exchange between Graphitic Nanostructures: A Microscopic Perspective.

Anh D Phan^1,2, Sheng Shen³, Lilia M Woods¹

¹†Department of Physics, University of South Florida, Tampa, Florida 33620, United States.

The Journal of Physical Chemistry Letters

|August 22, 2015

Summary

This summary is machine-generated.

Researchers studied electromagnetic heat exchange in graphene nanostructures using a modified coupled dipole method. This approach reveals pathways for controlling near-field radiation at the nanoscale.

Keywords:

graphene nanostructures near-field heat exchange plasmonics

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Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Electromagnetic radiative heat exchange is crucial for nanoscale thermal management.
Graphene nanostructures offer unique properties for controlling thermal radiation.
Understanding heat transfer at the atomic level is essential for designing advanced materials.

Purpose of the Study:

To investigate electromagnetic radiative heat exchange in graphene nanostructures.
To develop an atomistic approach for analyzing near-field radiation.
To identify mechanisms for controlling heat transfer at the nanoscale.

Main Methods:

Utilized the coupled dipole method modified by the fluctuation dissipation theorem.
Incorporated many-particle electromagnetic contributions.
Analyzed systems with nontrivial boundary conditions and varying temperatures.

Main Results:

Developed a microscopic picture of heat exchange in graphene nanostructures.
Introduced key parameters: transmission coefficient, characteristic temperature function, and atomic morphology.
Demonstrated control over near-field radiation through atomic-level manipulation.

Conclusions:

The atomistic approach provides fundamental insights into nanoscale heat transfer.
Graphene nanostructures can be engineered to control radiative heat exchange.
This work offers general strategies for near-field radiation management.