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A Novel Lubricant Based on Covalent Functionalized Graphene Oxide Quantum Dots
Andreas Wolk1, Marta Rosenthal2, Stephan Neuhaus1
1University of Paderborn, Department of Chemistry, Technical Chemistry, Warburgerstr. 100, 33098, Paderborn, Germany.
Scientific Reports
|April 13, 2018
Summary
Dodecyl amine functionalized graphene oxide quantum dots were synthesized and showed excellent solubility. These nanoparticles effectively reduced friction and inhibited corrosion on steel surfaces when applied as a thin film.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Graphene oxide quantum dots (GOQDs) are promising nanomaterials.
- Functionalization is key to tailoring GOQD properties for specific applications.
- Improving solubility and surface adhesion is crucial for practical use.
Purpose of the Study:
- To synthesize dodecyl amine-functionalized few-layer graphene oxide quantum dots (GOQDs).
- To investigate the structural, thermal, and solubility properties of the functionalized GOQDs.
- To evaluate the performance of these GOQDs as a lubricant and corrosion inhibitor on steel surfaces.
Main Methods:
- Synthesis of few-layer graphene oxide quantum dots.
- Covalent functionalization with dodecyl amine.
- Characterization using NMR, AFM-IR, AFM, and HRTEM.
- Thermal stability testing up to 220°C.
- Solubility tests in various organic solvents.
- Friction testing using a Thwing-Albert FP-2250 friction tester.
- Corrosion inhibition assessment.
Main Results:
- Successful synthesis of dodecyl amine-functionalized GOQDs with good yields.
- Confirmed covalent functionalization and determined structure/particle size.
- Demonstrated excellent solubility in diverse organic solvents and solution stability.
- Achieved a significant reduction in the friction coefficient on steel from 0.17 to 0.11.
- Observed a notable corrosion inhibition effect on steel surfaces.
Conclusions:
- Dodecyl amine functionalization enhances GOQD solubility and processability.
- The functionalized GOQDs exhibit excellent tribological and anti-corrosion properties on steel.
- Spray application of these GOQDs offers an efficient method for surface modification.
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