爆轰合成纳米氧化铝颗粒的生成时间估算

Estimation of growth time of nanometer aluminum oxide prepared by detonation

利用胶体理论中的快速聚沉动力学模拟尺寸为20nm的γ氧化铝球形颗粒在爆轰化学反应区的生成过程,估算出其生长时间为0.11μs,该时间值在爆轰化学反应区的时间长度(约1.0μs)内。理论计算证明该尺度的纳米氧化铝颗粒是在爆轰反应区内形成的,这与实验证明的结果一致。根据爆轰反应机理可知爆轰化学反应区的长度可以通过改变炸药的爆轰参数来改变,因此通过人为改变混合炸药的爆轰参数可以控制纳米氧化铝在反应区的生长时间,进而可以控制其最终的生长尺寸。

The aggregation formation of a 20-nm-size nanometer aluminum oxide particle is simulated by the fast coagulation dynamics in the colloid theory.Its growth time is 0.11 μs,the time is less than 1.0 μs which is maximum time of chemical reaction of conventional detonation.So the calculation result proves that the nanometer aluminum oxide particles actually generate in the chemical reaction zone of detonation.It is consistent with the experimental conclusion.The parameters of detonation can change the length of the chemical reaction zone according to the mechanics of detonation reaction.So the growth time of nanometer aluminum oxide in the chemical reaction zone can be controlled by artificially changing the parameters of detonation.In this way the size of the nanometer aluminum oxide particle can be controlled.