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Perikinetic aggregation of alkoxylated silica particles in two dimensions
YKI – Ytkemiska institutet.
1999 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 218, 77-87 p.Article in journal (Refereed)
Abstract [en]

Aggregation and cluster formation of a two–dimensional colloidal system consisting of 2 mm alkoxylated silica particles trapped at the air-toluene interface has 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 kT 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 DLCA like structure, Df ≈1.45, while the octadecyl system resulted in a more dense structure, Df ≈ 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).

Place, publisher, year, edition, pages
1999. Vol. 218, 77-87 p.
Keyword [en]
Perikinetic aggregation, particle interactions, fractal dimension, dynamic scaling, image analysis
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26718OAI: oai:DiVA.org:ri-26718DiVA: diva2:1053721
Note
A1225Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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