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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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Updated: Sep 25, 2025

Graphene Coatings for Biomedical Implants

Graphene Coatings for Biomedical Implants

Published on: March 1, 2013

High impact resistance in graphyne.

Yang Yang^1,2, Qiang Cao^1,2, Yang Gao³

¹The Institute of Technological Sciences, Wuhan University Wuhan 430072 China caoqiang@whu.edu.cn.

|May 2, 2022

Summary

This summary is machine-generated.

Graphyne sheets offer excellent ballistic protection, showing high impact resistance comparable to graphene. Different graphyne structures exhibit unique wave speeds and mechanical properties, suggesting their potential as protective materials.

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Area of Science:

Materials Science
Nanotechnology
Solid Mechanics

Background:

Graphyne, a novel carbon allotrope, has been synthesized with promising mechanical and electrical properties.
Understanding the mechanical behavior of new materials is crucial for their application in protective structures.

Purpose of the Study:

To investigate the ballistic protection capabilities of various graphyne structures (α-, β-, δ-, γ-graphyne).
To compare the impact resistance and mechanical properties of graphyne with graphene.

Main Methods:

Utilized molecular dynamics simulations combined with elastic theory.
Calculated in-plane elastic wave and out-of-plane cone wave velocities.
Determined specific penetration energies and Young's modulus.

Main Results:

Graphyne exhibits specific penetration energies approximately 83% of graphene, indicating superior impact resistance.
γ-Graphyne shows high sound wave speeds and a Young's modulus ~60% of graphene.
α-Graphyne demonstrated the highest penetration energy and impact resistance across most tested projectile speeds.

Conclusions:

Graphyne possesses significant potential as a protective structural material due to its high impact resistance.
The distinct mechanical properties of different graphyne isomers allow for tailored applications in protective technologies.