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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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Related Experiment Video

Updated: Jun 4, 2025

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

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Published on: April 1, 2017

Deciphering Surface-Localized Structure of Nanodiamonds.

Li Ma¹, Zhijie He¹, Keyuan Chen¹

¹Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.

Nanomaterials (Basel, Switzerland)

|December 27, 2024

Summary

This summary is machine-generated.

This study analyzes nanodiamonds (NDs) using simulations, revealing a stable surface layer and controllable amorphous structures. These findings offer new methods for nanomaterial control in practical applications.

Keywords:

core–shell structure density functional theory molecular dynamics simulation nanodiamonds size effect surface structure

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Area of Science:

Materials Science
Nanotechnology
Computational Physics

Background:

Nanomaterials, particularly nanodiamonds (NDs), exhibit remarkable properties and broad applications.
Controlling atomic-level structures of NDs is challenging but crucial for understanding their behavior.
NDs are valued for their surface multifunctionality and chemical stability.

Purpose of the Study:

To analyze the structural and property characteristics of nanodiamonds (NDs).
To elucidate the core-shell interactions and surface structures of NDs for practical applications.
To investigate the thermodynamic stability of amorphous structures on ND surfaces.

Main Methods:

Density Functional Theory (DFT) for electronic characteristics of the surface layer.
Lattice dynamics and Molecular Dynamics (MD) simulations for structural analysis.
Analysis of core-shell interactions and surface amorphous structures.

Main Results:

Surface layer thickness of NDs remains constant at approximately 3 Å, irrespective of particle size.
DFT successfully computed subtle electronic characteristics of the ND surface layer.
Amorphous structures on ND surfaces are thermodynamically stable if the packing coefficient exceeds 0.38.

Conclusions:

A consistent surface layer structure and controllable amorphous surface properties were identified in nanodiamonds.
The study provides insights into core-shell interactions crucial for nanomaterial design.
This research offers a novel approach for controlling nanomaterials in real-world applications.