Microwave extinction characteristics of nanoparticle aggregates

2016 Global Conference on Polymer and Composite Materials

材料科学;化学

Wu, Y.P.^1 ; Cheng, J.X.^1,2 ; Liu, X.X.^3 ; Wang, H.X.^3 ; Zhao, F.T.^1 ; Wen, W.W.^1

Kadinuo Science and Technology (Beijing) Co., Ltd., Beijing

100013, China^1

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing

100084, China^2

Xi'An Research Institute of High Technology, Xi'an

710025, China^3

关键词: Diffusion limited aggregation model;    Discrete dipole approximation;    Extinction characteristics;    Extinction cross section;    Fractal structures;    Nanoparticle aggregate;    Numerical results;    Spherical nanoparticles;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/137/1/012042/pdf
DOI  :  10.1088/1757-899X/137/1/012042

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Structure of nanoparticle aggregates plays an important role in microwave extinction capacity. The diffusion-limited aggregation model (DLA) for fractal growth is utilized to explore the possible structures of nanoparticle aggregates by computer simulation. Based on the discrete dipole approximation (DDA) method, the microwave extinction performance by different nano-carborundum aggregates is numerically analyzed. The effects of the particle quantity, original diameter, fractal structure, as well as orientation on microwave extinction are investigated, and also the extinction characteristics of aggregates are compared with the spherical nanoparticle in the same volume. Numerical results give out that proper aggregation of nanoparticle is beneficial to microwave extinction capacity, and the microwave extinction cross section by aggregated granules is better than that of the spherical solid one in the same volume.