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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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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

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Published on: November 5, 2015

Highly Thermo-Conductive Three-Dimensional Graphene Aqueous Medium.

Zheng Bo^1,2, Chongyan Ying^1,2, Huachao Yang^3,4

¹State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People's Republic of China.

Nano-Micro Letters

|June 17, 2021

Summary

A novel three-dimensional graphene structure with covalent-bonding nanofins (3D-GS-CBF) significantly enhances aqueous medium thermal conductivity. This stable 3D graphene filler offers superior performance for thermal management and solar vapor generation applications.

Keywords:

Multiscale modeling Practical thermal management Solar thermal conversion Thermo-conductive aqueous medium Three-dimensional graphene

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

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Published on: September 23, 2018

Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

High thermal conductivity in aqueous media is essential for advanced thermal applications.
Graphene's 2D nature leads to anisotropic thermal conductivity and structural defects, limiting its practical use.
Three-dimensional (3D) graphene architectures offer a potential solution to overcome these limitations.

Purpose of the Study:

To propose and demonstrate a 3D graphene structure with covalent-bonding nanofins (3D-GS-CBF) as an effective filler for aqueous media.
To investigate the thermal conductivity enhancement and stability of the proposed 3D-GS-CBF aqueous medium.
To evaluate the performance of the 3D-GS-CBF aqueous medium in solar vapor generation and thermal management.

Main Methods:

Fabrication of 3D graphene structure with covalent-bonding nanofins (3D-GS-CBF).
Preparation of 3D-GS-CBF aqueous medium with low filler concentration (0.26 vol%).
Multiscale modeling including non-equilibrium molecular dynamics simulations and heat conduction model.

Main Results:

Achieved a thermal conductivity of 2.61 W m^-1 K^-1 for the 3D-GS-CBF aqueous medium, a 1300% enhancement.
Demonstrated long-term stability of 3D-GS-CBF in solution for over 6 months.
Improved solar vapor evaporation rate by 1.5 times and showed superior cooling performance compared to commercial coolants.

Conclusions:

The proposed 3D-GS-CBF is a highly effective filler for creating advanced aqueous thermal mediums.
3D-GS-CBF addresses the stability issues associated with conventional graphene networks.
The developed aqueous medium shows significant potential for high-performance thermal management and solar energy applications.