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Network Covalent Solids02:18

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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.
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Related Experiment Video

Updated: Jun 2, 2026

Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Published on: July 3, 2025

Graphene oxide hydrogel at solid/liquid interface.

Jiao-Jing Shao1, Si-Da Wu, Shao-Bo Zhang

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.

Chemical Communications (Cambridge, England)
|April 19, 2011
PubMed
Summary
This summary is machine-generated.

Porous alumina and graphene oxide (GO) aqueous dispersions exhibit strong interfacial interactions. This interaction rapidly enriches GO on alumina, forming a GO hydrogel.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Porous alumina is a widely used ceramic material.
  • Graphene oxide (GO) is a promising nanomaterial with unique properties.
  • Controlling the interaction between ceramic surfaces and nanomaterials is crucial for developing advanced composites.

Purpose of the Study:

  • To investigate the interfacial interaction between porous alumina and graphene oxide (GO) aqueous dispersion.
  • To understand the mechanism of GO enrichment on porous alumina surfaces.
  • To explore the formation of GO-based hydrogels on ceramic substrates.

Main Methods:

  • Characterization of porous alumina.
  • Preparation of graphene oxide (GO) aqueous dispersion.
  • Adsorption studies of GO onto porous alumina.
  • Microscopy and spectroscopy techniques to analyze the GO layer.

Main Results:

  • A strong solid/liquid interfacial interaction was observed between porous alumina and GO dispersion.
  • Rapid enrichment of GO onto the porous alumina surface was confirmed.
  • The formation of a stable graphene oxide hydrogel on the alumina surface was achieved.

Conclusions:

  • The strong interfacial interaction facilitates efficient GO adsorption and hydrogel formation.
  • Porous alumina can serve as a substrate for fabricating GO-based functional materials.
  • This study offers insights into the surface modification of ceramics with nanomaterials.