Richter Andreas, Babick Frank, Stintz Michael
Institut für Verfahrenstechnik und Umwelttechnik, TU Dresden, 01062 Dresden, Germany.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e483-90. doi: 10.1016/j.ultras.2006.05.057. Epub 2006 Jun 5.
The theoretical advantages of ultrasonic attenuation spectroscopy for particle size are currently not fully utilized. Especially in the region of larger particles, there is a lack of experimental confirmation of applicable models which may be used to infer particle sizes from measured attenuation spectra. With the present work, an attempt is made to supply experimental data, obtained with a commercially available ultrasonic attenuation spectrometer, and model calculations, which are based on the resonant scattering theory. It is shown that measured attenuation results for various combinations of disperse and continuous phase for both polydisperse emulsions and suspensions are reproducible by calculation. The approach is further examined for suspensions of porous particles. Here, the resonant scattering approach is combined with the Biot model for poroelasticity to obtain attenuation results with several fractions of titania aggregates, differing in particle size and pore diameter. The results indicate that the theory of resonant scattering is a valid approach if applied to particle size characterization in the large particle limit.
超声衰减光谱法在粒度分析方面的理论优势目前尚未得到充分利用。特别是在较大颗粒区域，缺乏对可用于从测量的衰减光谱推断粒度的适用模型的实验验证。通过本研究，尝试提供使用市售超声衰减光谱仪获得的实验数据以及基于共振散射理论的模型计算结果。结果表明，通过计算可以重现多分散乳液和悬浮液中分散相和连续相各种组合的测量衰减结果。该方法进一步用于多孔颗粒悬浮液的研究。在这里，共振散射方法与孔隙弹性的毕奥模型相结合，以获得不同粒径和孔径的二氧化钛聚集体不同比例的衰减结果。结果表明，共振散射理论在大颗粒极限下应用于粒度表征时是一种有效的方法。
