<p>Carbon nanoparticles (CNPs) are synthesized from candle soot and subjected to fractional isolation and characterization. Highly thermally stable (onset of degradation 697°C) and crystalline CNPs (size 20–25 nm) of superior purity were isolated by multistage separation and isolation process. In isolation process, various other fractions with sizes less and more than the size 20–25 nm were isolated and characterized. Nanolubricating fluid was prepared with purest fraction isolated and SAE 30 engine oil and its wear preventive property was evaluated. About 29% reduction in wear scar diameter with smoother wear scar morphology was observed, which exhibits good wear preventive property of nanolubricating fluid.</p
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