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Zhou Gang;Yun Shourong;Huang Fenglei(Mechanical and Engineering department, BIT, Beijing, 100081,P. R. China)  
The carbon beads executing Borwnian motion in a hot dense fluid of detonation re-action zone form carbon liquid droplets at the C-J front through random collisions. The processcan be described by colloidal theory. It is supposed that the final number of carbon droplets in thedetonation products at the end of the detonatin reaction zone is equal to that of carbon droplets atthe end of the clustering process. On this basis the calculated formation time for the liquiddroplets of diamond-like carbon is within the time interval of the reaction zone. Ultrafine dia-mond particles with a big size ( ̄20nm) contain about 7. 36 × 1e ̄5 carbon atoms and may be ap-proximately treated as ninteenth order droplets strictly undergoing two-molecule-reaction in thereaction zone. When the number of carbon atoms making up the diamond particle with a diameterof 20nm reaches the above definite amount,the detonation reaction process ends. The time inter-val when carbon droplets are formed can be estimated.
【CateGory Index】: O613.71
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