Abstract
The dispersion stability of graphene in liquids plays a very important role in improving application efficiency in many fields, such as in nanofluid, composite materials, and biomedical fields. Because of the size of graphene materials greatly affects the dispersion and stability of graphene, we take a new approach of using the high-energy ball grinding methods for reducing the size and increasing the surface area of multi-layer graphene materials (GNPs). Surface measurements (FE-SEM), Raman spectroscopy, FTIR infrared absorption spectra, BET (surface area) measurements were used to evaluate the material properties, dispersion, and stability of GNPs in liquids. The results show that high-energy ball milling is a very effective method to improve the dispersion and stability of GNPs in liquids. Graphene materials milled during 5 hours has the size of GNPs of 218 nm, the surface area of 196.63 m2/g – an increase of 555% compared with original graphene; GNPs have the best dispersion stability at a Zetapotential of 29.2 mV.
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