Synthesis and Characterization of Nano Graphite Powder

Graphite, a crystalline form of carbon, is one of the most stable forms of natural carbon under standard conditions. Graphite is widely used in crucibles, electrodes, batteries, fuel cells, lubricants, steel linings and conductive coatings.

Various synthesis methods for graphene nanoparticles have been developed and investigated. They can be classified into two types: pristine graphene and reduced graphene oxide (rGO). In this paper, we have synthesized water-soluble nanographite by in situ emulsion polymerization with methacrylate as the polymeric monomer. We also examined the dispersion stability and dispersion state of nanographite particles in aqueous environment by UV-vis spectrophotometry and scanning electron microscopy.

In order to evaluate the dispersion stability of the emulsion, the absorbance of different supernatants was measured by UV-vis spectrophotometry at different temperatures. The absorption values of the samples were compared with those of a reference sample. The results show that the absorbance of the emulsion has a tendency to change at higher temperatures.

The optimal polymerization condition is 70degC and 5 h. After that, the water-soluble nanographite is added into a water-based cutting fluid as the lubricant additive. The performance of the lubricant is evaluated on four-ball friction tester and surface tensiometer, and it was found that the addition of nanographite to the water-based cutting fluid decreases the tribological characteristics of the cutting fluid such as the coefficient of friction and wear scar diameter by 44% and 49%, respectively.

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