中文摘要：

利用分形生长理论的有限扩散模型（DLA）模拟了凝聚粒子的可能结构,基于离散偶极子近似方法（DDA）对纳米石墨凝聚粒子的红外消光截面进行了数值计算,分析了凝聚粒子包含的纳米石墨粒子数目、原始粒径及凝聚粒子分形结构、空间取向对红外消光性能的影响,比较了纳米石墨凝聚粒子和等体积球的红外消光特性。结果表明,纳米石墨粒子适当凝聚有利于红外消光,在中、远红外,凝聚粒子的消光性能明显好于等体积球粒子的消光性能。

英文摘要：

The diffusion-limited aggregation model（DLA） for fractal growth is used to study the nano-graphite aggregation.The possible structures of nano-graphite aggregates are got by simulating.Based on the discrete dipole approximation method（DDA）,the effects of the number of particles,original radius,fractal structure and orientation on infrared extinction are discussed,and the infrared extinction properties of nano-graphite aggregates are compared with the spherical nano-graphite particle with same volume.The research results show that propriety of aggregation for nano-graphites is good for infrared extinction,and the infrared extinction properties of nano-graphite aggregates are better than those of spherical particle with same volume.