Distinguishing Heteroaggregation from Homoaggregation in Mixed Binary Particle Suspensions by Multiangle Static and Dynamic Light Scattering
Distinguishing Heteroaggregation from Homoaggregation in Mixed Binary Particle Suspensions by Multiangle Static and Dynamic Light Scattering
复制标题
通过多角度静态和动态光散射区分混合二元颗粒悬浮液中的异质聚集和同质聚集
DOI：
10.1021/jp021792h
复制
发表时间：
2002
影响因子：
3.3
通讯作者：
M. Borkovec
中科院分区：
文献类型：
--
作者：
W. L. Yu;M. Borkovec
时间分辨多角度光散射用于测量含水二元胶体颗粒混合物中的绝对异聚集（异凝聚）速率常数。这些测量是可能的，尽管同时发生的同质聚集（homocoagulation）。该程序可用于静态以及动态光散射，即使后者的技术更准确，更灵敏。该方法利用了不对称颗粒二聚体的形状因子的差异。因此，需要不同尺寸的颗粒，但该方法已经对10%的尺寸差异敏感。我们已经将该技术应用于100 - 200 nm尺寸范围内的胶乳颗粒，其中Rayleigh-Gans-Debye近似是准确的，并获得了不对称二聚体的形成聚集（凝聚）速率常数作为高达300 mM的离子强度的函数。
Time-resolved multiangle light scattering is used to measure absolute heteroaggregation (heterocoagulation) rate constants in aqueous binary colloidal particle mixtures. These measurements are possible despite the simultaneous occurrence of homoaggregation (homocoagulation). The procedure can be used with static as well as with dynamic light scattering, even though the latter technique is more accurate and more sensitive. The approach exploits the differences in the form factors of the asymmetric particles dimers. Particles of unequal size are therefore needed, but the method is sensitive already to 10% difference in size. We have applied the technique for latex particles in 100−200 nm size range, where the Rayleigh−Gans−Debye approximation is accurate, and obtained the formation aggregation (coagulation) rate constants for the asymmetric dimers as a function of the ionic strength up to 300 mM.