Effect of attrition milling on dispersion of onion like carbon in aqueous medium |
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Authors: | J-Y Lee K-H Cho D-P Lim Y-B Lee D-S Lim |
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Institution: | (1) Department of Materials Science and Engineering, Korea University, Seoul, 136-701, South Korea |
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Abstract: | Nanodiamond powders, synthesized by the detonation of explosives, can be transformed into onion like carbon (OLC) by means
of thermal treatment in inert environments. OLC aggregates could not be reduced to nanometer sizes by conventional milling.
The effect of milling with micron sized ceramic beads in water with polyacrylic acid on the dispersion of onion like carbon
was investigated. The zeta potential of the OLC slurry with added surfactant was measured, in order to examine the electrostatic
repulsion as a means of dispersing the OLC. The size of the OLC particles in water was measured using a particle size analyzer.
Fourier transform infra-red spectroscopy, Raman spectroscopy, X-ray diffraction, and high-resolution transmission electron
microscopy were used to observe the differences between the milled and non-milled OLC. The particle size of the OLC decreased
steadily with increasing surfactant concentration in the water and milling time. By milling with a PAA concentration over
8.0×10-4 m/L, the size of the OLC particles decreased to less than 100 nm. The effect of attritional milling with micron sized beads
and the addition of surfactant on the dispersion of OLC was confirmed. It was observed that the defects on the dispersed OLC
increased with increasing milling time.
PACS 81.07.-b; 81.05.Tp; 81.05Uw; 83.80.Hj |
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Keywords: | |
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