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Dissolving and uniform distribution of carbon nanoparticles in different media is one of the urgent problems in the technology of composite materials. The compatibility of CNTs and GNPs with polar solvents and polymers can be achieved, with more or less success, by oxidation of the carbon surface, whereas the compatibility of carbon nanomaterials with non-polar media is a much more complex task. We have solved this problem by modifying the CNTs and GNPs surface with titanium stearate. In the surface layer, the stearate groups are directed outside and approve good compatibility with oils, whereas the titanium atoms represent bridges between the stearate and carbon surfaces. The advantage of the modification method developed by us is that the modification process is carried out in an aqueous solution of stearate and titanium compounds, according to the scheme presented in Fig.
The same scheme is realized for oxidized GNPs.
The final product represents dry granules containing 40-45 % of CNTs or GNPs and 55-60 wt.% of titanium stearate. The modified products form stable colloids in oil.
The CNTs and GNPs modified with titanium stearate can be employed as additives for lubricants, polymers, etc.