超细金刚石对应的碳液滴生成时间估算

FORMATION TIME ESTIMATION OF THECORRESPONDING CARBON LIQUID DROPLETSOF ULTRAFINE DIAMONDS

在爆轰反应区的热密产物流中进行Ｂｒｏｗｎ运动的最初碳原子“珠”通过任意碰撞在Ｃ－Ｊ面处聚结成碳液滴。这个过程可以近似用胶体理论的快速聚沉动力学来描述。假定在爆轰反应区末端爆轰产物中碳液滴数等于聚沉过程结束时的碳滴数，则在此基础上计算得到的类金刚石碳滴的生成时间在爆轰反应区的时间长度内，实验中得到的超细金刚石的大颗粒（～２０ｎｍ）含有约７．３６×１０￣５个原子，其对应反应区内的液态碳滴可以近似处理成严格进行两分子反应的碳的十九级滴，当碳滴所包含的碳原子数达到以上特定值时，爆轰反应过程结束，因此碳滴形成时间能被估算出来。

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.