Nano Plan HEAT RESISTANT NANODIAMONDS BY DETONATION SYNTHESIS

Nano. Plan HEAT RESISTANT NANODIAMONDS BY DETONATION SYNTHESIS Center of Technology Nano. Plan: Irina Larionova, Dr. Yury Ladygin Nikolay Bychin, Dr. Alexander Frolov Russia

Nano. Plan Production of Nanodiamonds TNT + RDX P>16 -30 GPa Т=3000 -4000 К Polydispersity 3 Surface polyfunctionality

Nano. Plan IR-spectra of detonation diamonds of various types Nano diamonds of VNIITF Nano diamonds of FSUE FR & PC ALTAI Nano diamonds of ZAO ALIT А. P. Koshcheyev Thermal Desorption Massspectrometry…. Ros. Chemical Journal, 2008, vol. I. II, No 5

Nano. Plan Oxidation regularity of nano size diamonds in air ND aggregates number and weight distribution Thermal stability of the fractioned ND obtained by ”dry” synthesis 20 nm 557. 9 0 С 45 nm 592. 4 0 С 65 nm 597. 3 0 С 100 nm 599. 4 0 С Aggregate size influence on the ND oxidation rate in air

Nano. Plan Surface structure influence on thermal stability of nano diamonds Change of ND oxidation thermal effect with the growth of powders density

Conclusions The reactivity of nano size diamonds reduces in the following sequence: ND of “dry” synthesis, ND of wet synthesis, ND from ice shell. The thermal stability of dimensional fractions of ND while heating in air logically reduces with reducing their aggregates size. The rate of oxidation in air of ND fraction 20 nm in size is 4. 5 times higher than the same of fractions 100 nm in size, their thermal stability changing respectively. The thermal stability of ND powders depends on their surface purity. Nondiamod carbon phases and sorbet admixtures available reduce thermal stability and thermal effect of the material oxidation. The thermal stability of nano diamond in nitrogen is high and determined only by the portion of volatiles in the ND composition. After heat treatment in nitrogen thermal stability of ND powders of any fractions increases on the average by 10 degrees. The TGA allows us to perform express-evaluation of diamond powders before introducing them into composition. The combination of the TGA and mass-spectrometry of thermal desorption products gives us possibility of finding the manufacturer of this diamond.

Acknowledgments This work has been performed within the scope of investigations under ISTC project No 1708 Thank you very much for your attention!