Journal
NANOMATERIALS
Volume 13, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nano13050901
Keywords
graphene nanoplatelets; cement-based composites; oxidation; mechanical properties; electrical properties
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The dispersion and interaction of graphene in the cement matrix can be improved by oxidizing graphene with sulfonitric acid. This oxidation process enhances the mechanical and electrical properties of the final cement composites.
Graphene nanoplatelets can improve the electrical and mechanical properties of cement matrix composites. The dispersion and interaction of graphene in the cement matrix appears to be difficult due to its hydrophobic nature. By introducing polar groups, graphene oxidation improves the level of dispersion and interaction with the cement. In this work, graphene oxidation using sulfonitric acid for 10, 20, 40, and 60 min was studied. Thermogravimetric Analysis (TGA) and Raman spectroscopy were employed to analyze the graphene before and after the oxidation. The mechanical properties of the final composites showed an improvement of 52% in the flexural strength, 4% in the fracture energy, and 8% in the compressive strength in the case of 60 min of oxidation. In addition, the samples showed a reduction of at least one order of magnitude in electrical resistivity when compared with pure cement.
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