Galletto Paolo, Lin Wei, Borkovec Michal
Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
Phys Chem Chem Phys. 2005 Apr 7;7(7):1464-71. doi: 10.1039/b417761d.
The early stages of the heteroaggregation (or heterocoagulation) of latex particles were probed by time resolved simultaneous static and dynamic light scattering (SSDLS). We show that the heteroaggregation rate constant and the apparent hydrodynamic radius of the dimer can be obtained by analyzing the SSDLS data without the need to invoke the optical form factors for the doublets. A similar approach was proposed earlier for homoaggregation. The validity of the present approach was tested by investigating heteroaggregation between sulfate and amidine latex particles of different size, and similar data for smaller particles, which were previously analyzed in terms of the Rayleigh-Debye-Gans (RDG) theory. In this case, the presently obtained rate constants were found to be in excellent agreement with the results based on RDG. The present technique is particularly interesting for larger particles, where RDG cannot be applied, or to particles of more complex shapes, where the optical form factor cannot be easily evaluated.
通过时间分辨同步静态和动态光散射（SSDLS）对胶乳颗粒的异质聚集（或异质凝聚）早期阶段进行了探测。我们表明，通过分析SSDLS数据可以获得异质聚集速率常数和二聚体的表观流体动力学半径，而无需调用双峰的光学形状因子。早期针对同质聚集也提出了类似的方法。通过研究不同尺寸的硫酸盐和脒基胶乳颗粒之间的异质聚集以及较小颗粒的类似数据（此前根据瑞利 - 德拜 - 甘斯（RDG）理论进行了分析）来测试本方法的有效性。在这种情况下，发现目前获得的速率常数与基于RDG的结果非常吻合。本技术对于无法应用RDG的较大颗粒或难以轻松评估光学形状因子的更复杂形状的颗粒特别有意义。
