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Orthokinetic aggregation in two dimensions of monodisperse and bidisperse colloidal systems
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 220, 269-280 p.Article in journal (Refereed)
Abstract [en]

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. The interactions between the monodisperse latex particles floating at the air-water interface were controlled either by varying the electrolyte concentration or by creating a bidisperse system through addition of small particles. The results show that the clusters in all the systems are characterized by a high fractal dimension; indicating that the clusters are rearranged and densified by the shear. Kinetic analysis suggests that aggregation of the monodisperse systems mainly proceeds through homogeneous aggregation, i.e. large clusters sticking to other large clusters. The weakly aggregated monodisperse system displayed a transition from heterogeneous to homogenous aggregation of clusters with time which could be related to an incubation time. The bidisperse system, finally, with a size ratio around 10, favored a more heterogeneous aggregation between small and large clusters throughout the aggregation process; a slightly lower fractal dimension was observed compared to the strongly aggregated monodisperse system.

Place, publisher, year, edition, pages
1999. Vol. 220, 269-280 p.
Keyword [en]
Shear induced aggregation, orthokinetic, two-dimensions, kinetics, dynamic scaling, fractal dimension, colloids, bidisperse
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26721OAI: oai:DiVA.org:ri-26721DiVA: diva2:1053724
Note
A1273Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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