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Perikinetic Aggregation of Alkoxylated Silica Particles in Two Dimensions

✍ Scribed by Peter H.F Hansen; Lennart Bergström

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
589 KB
Volume
218
Category
Article
ISSN
0021-9797

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✦ Synopsis

Aggregation and cluster formation of a two-dimensional colloidal system consisting of 2-m alkoxylated silica particles trapped at the air-toluene interface have been studied. This novel system allows particle interactions to be controlled by varying the length of the grafted alkyl chains; simple estimates suggest particle bond strengths of 15 and 30 kT for the octadecyl-and octyl-coated system, respectively. Video-enhanced microscopy and image analysis enabled a simultaneously study of kinetics and structure of the ensemble of clusters in situ. The octyl system displayed a DLCAlike structure, D f Ϸ 1.45, whereas the octadecyl system resulted in a more dense structure, D f Ϸ 1.55. The temporal evolution of the cluster-mass distribution displayed a transition point between regimes of slower and faster aggregation for both systems, which was interpreted as a transition from DLCA to convection-limited cluster aggregation (CLCA).

📜 SIMILAR VOLUMES

Orthokinetic Aggregation in Two Dimensio
Orthokinetic Aggregation in Two Dimensions of Monodisperse and Bidisperse Colloidal Systems
✍ Peter H.F. Hansen; Martin Malmsten; Björn Bergenståhl; Lennart Bergström 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 190 KB

Orthokinetic aggregation of colloids trapped at the air-liquid interface was studied by direct imaging in a couette cell. This method allowed us to follow the temporal evolution of both the cluster-mass distribution and the cluster structure at a shear rate where Brownian aggregation is suppressed.