The surface modification results were analysed by the methods of the specific surface area measurement and infraredabsorption spectroscopy, and the best conditions for modification were obtained.
Infra - redabsorption takes place only when there is a change of dipole moment.
红外吸收峰仅在有偶极矩变化时才能实现。
3
Thirdly, analyzing crystal structure and character by X-ray diffraction, infra-red spectrum, Raman spectrum, absorption spectrum and fluorescence spectrum.