| abstract |
An aqueous suspension liquid of finely divided diamond particlesncomprising 0.05 to 160 parts by weight of a finely divided diamond particlesnin 1000 parts of water, wherein; (i) the finely divided diamond particles havenan element composition consisting mainly of 72 to 89.5 % by weight ofncarbon, 0.8 to 1.5 % of hydrogen, 1.5 to 2.5 % of nitrogen, and 10.5 to 25.0 %nof oxygen; (ii) and, almost all of said diamond particles are in the range of 2nnm to 50 nm in diameters thereof (80 % or more by number average, 70 % ornmore by weight average), (iii) and, said finely divided diamond particlesnexhibit a strongest peak of the intensity of the Bragg angle at 43.9° (2±2°),nstrong and characteristic peaks at 73.5° (2±2°) and 95°(2±2°), a warped halonat 17°(2±2°), and no peak at 26.5°, by X-ray diffraction (XRD) spectrumnanalysis using Cu-Kα radiation when dried, (iv) and, specific surface area ofnsaid diamond particles when dry state powder is not smaller than 1.50×10 5 nm 2 /kg, and substantially all the surface carbon atoms of said particles arenbonded with hetero atoms, and the total absorption space of said powder isn0.5m 3 /kg or more, when dried. The diamond particles are very active andndispersible in aqueous liquid in stable, and have essentially same mechanicalnproperties as that of usual diamonds. |