López-López J M, Schmitt A, Moncho-Jordá A, Hidalgo-Álvarez R
Grupo de Física de Fluidos y Biocoloides, Dpto. Física Aplicada, Facultad de Ciencias, Campus Fuentenueva s/n, Granada, Spain.
Soft Matter. 2006 Nov 15;2(12):1025-1042. doi: 10.1039/b608349h.
This review reports on recent advances in our knowledge about the stability of binary colloids. We focus not only on experimental results but also discuss theoretical and simulation studies regarding kinetic and structural aspects of heteroaggregation processes arising in such systems. In the first part of this work, heteroaggregation of oppositely charged particles is reviewed. When the interactions are short ranged, binary diffusion-limited cluster-cluster aggregation takes place. In this case, the short time behavior of the system follows the Hogg, Healy and Fuerstenau (HHF) theory. At long times, however, stable aggregates may form and remain in the system. Furthermore, cluster discrimination is observed, clusters that differ only by one constituent particle were found to behave quite differently. When the range of the interactions is increased, the latter effects become more pronounced. The fractal dimension of heteroaggregates is, in general, smaller than the values reported for fast and slow homoaggregation processes. In some cases, even values close to unity were obtained. This means that heteroaggregates have an open branched structure that may approach a chain-like morphology. In the second part of this work, we briefly discuss similar effects arising in heteroaggregation phenomena due to differences in particle size and chemical composition. The third part of this review tackles recent developments in the field of equilibrium phase diagrams of binary colloids. In the last section, the relatively small number of papers about heteroaggregation processes in two-dimensional systems is also discussed.
本综述报告了我们在二元胶体稳定性知识方面的最新进展。我们不仅关注实验结果，还讨论了关于此类系统中异质聚集过程的动力学和结构方面的理论及模拟研究。在这项工作的第一部分，回顾了带相反电荷粒子的异质聚集。当相互作用范围较短时，会发生二元扩散限制的簇 - 簇聚集。在这种情况下，系统的短时间行为遵循霍格、希利和富尔斯特瑙（HHF）理论。然而，在长时间时，可能会形成稳定的聚集体并留在系统中。此外，还观察到簇的区分现象，仅相差一个组成粒子的簇表现出截然不同的行为。当相互作用范围增加时，后一种效应会更加明显。一般来说，异质聚集体的分形维数小于快速和慢速均相聚集过程所报道的值。在某些情况下，甚至获得接近1的值。这意味着异质聚集体具有开放的分支结构，可能接近链状形态。在这项工作的第二部分，我们简要讨论了由于粒径和化学成分差异在异质聚集现象中产生的类似效应。本综述的第三部分探讨了二元胶体平衡相图领域的最新进展。在最后一节中，还讨论了关于二维系统中异质聚集过程的相对较少的论文。
