Zhou Hongwei, Xu Shenghua, Mi Li, Sun Zhiwei, Qin Yanming
Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, No.15 Beisihuanxi Road, Beijing 100190, People's Republic of China and National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, No.15 Beisihuanxi Road, Beijing 100190, People's Republic of China.
J Chem Phys. 2014 Sep 7;141(9):094302. doi: 10.1063/1.4893876.
Absolute coagulation rate constants were determined by independently, instead of simultaneously, using static and dynamic light scattering with the requested optical factors calculated by T-matrix method. The aggregating suspensions of latex particles with diameters of 500, 700, and 900 nm, that are all beyond validity limit of the traditional Rayleigh-Debye-Gans approximation, were adopted. The results from independent static and dynamic light scattering measurements were compared with those by simultaneously using static and dynamic light scattering; and three of them show good consistency. We found, theoretically and experimentally, that for independent static light scattering measurements there are blind scattering angles at that the scattering measurements become impossible and the number of blind angles increases rapidly with particle size. For independent dynamic light scattering measurements, however, there is no such a blind angle at all. A possible explanation of the observed phenomena is also presented.
通过独立而非同时使用静态和动态光散射来测定绝对凝聚速率常数，其中所需的光学因子由T矩阵法计算得出。采用了直径为500、700和900nm的乳胶颗粒聚集悬浮液，这些颗粒均超出了传统瑞利 - 德拜 - 甘斯近似的有效性极限。将独立的静态和动态光散射测量结果与同时使用静态和动态光散射的结果进行了比较；其中三个结果显示出良好的一致性。我们在理论和实验上发现，对于独立的静态光散射测量，存在一些盲散射角，在这些角度下散射测量变得不可能，并且盲角的数量随着粒径迅速增加。然而，对于独立的动态光散射测量，根本不存在这样的盲角。还给出了对观察到的现象的一种可能解释。
