Properties of individual fractions of detonation nanodiamond

Detonation nanodiamonds synthesized and purified on an industrial scale were additionally purified and separated into narrow size fractions by centrifugation. The average particle size for the smallest fraction was lower than 30 nm and the yield was about 20 wt.%. Using FTIR spectra analysis, it was demonstrated that ND aggregates of different sizes, separated from the same pristine ND, have different surface compositions of active surface groups, particularly oxygen-containing groups, which finally influence their zeta potential values and hydrosol stability. Using DTA analysis, the higher reactivity of the smallest fractions during heat treatment in air was also demonstrated. (c) 2006 Elsevier B.V. All rights reserved.