关键词: 压汞法, 分形维数, 冷冻干燥, 多孔介质

Abstract: In order to characterize quantitatively the microstructure of freeze-dried material, the computational method of surfacefractal dimentsion through mercury intrusion is introduced. The surface fractals of freeze-dried materials, taking beef and turkeyfor examples, are calculated respectively. The results show that it is easy and reasonable to obtain the surface fractals of freeze-dried materials by mercury porosimetry, and surface fractals can be employed to characterize roughness and complexity of thepore distribution in freeze-dried materials. The surface fractal depends intimately upon the pore distribution of freeze-driedmaterial. The more the volume fraction of micro-pores in freeze-dried material is, the larger the surface fractal dimension will beobtained.

Key words: mercury intrusion, surface fractal dimension, freeze-drying, porous media