𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A dynamic light scattering study on aggregation of rodlike colloidal particles

✍ Scribed by R. Brunner; S. Gall; W. Wilke; M. Zrinyi

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
403 KB
Volume
239
Category
Article
ISSN
0378-4371

No coin nor oath required. For personal study only.

✦ Synopsis

The kinetics of aggregation of rodlike iron(III)hydroxide colloids in aqueous solution have been investigated by dynamic light scattering. KNO3 and KzSO 4 electrolytes were used in different concentrations as controllers for the aggregation kinetics. The experimental results of the cluster growth were fitted in the fast regime to the diffusion limited aggregation (DLA) and are characterized by a power law with a fractal dimension dr = 1.71. Clearly, the slow aggregation shows the exponential kinetics of the reaction limited aggregation (RLA). In the growing curves of the colloid clusters, a transition to a very fast aggregation kinetic was observed. The transition occured at a typical aggregate size which was crucially dependent on the colloid concentration. This was taken as an evidence for a percolation process.

πŸ“œ SIMILAR VOLUMES

A Study of Colloidal Particle Brownian A
A Study of Colloidal Particle Brownian Aggregation by Light Scattering Techniques
✍ Athanasios S. Kyriakidis; Stergios G. Yiantsios; Anastasios J. Karabelas πŸ“‚ Article πŸ“… 1997 πŸ› Elsevier Science 🌐 English βš– 169 KB

Aggregation kinetics and aggregate structure are studied for monodisperse polystyrene latex particles of diameter 60 and 140 nm. The experimental part consists of measurements over a rather broad range of electrolyte concentrations (0.1 to 0.8 M NaCl) and for particle volume fractions 10(-6) to 10(-

Dynamic Light-Scattering Study of Aggreg
Dynamic Light-Scattering Study of Aggregating and Gelling Colloidal Disks
✍ Taco Nicolai; Stephane Cocard πŸ“‚ Article πŸ“… 2001 πŸ› Elsevier Science 🌐 English βš– 117 KB

We have studied the relaxation of the concentration fluctuations of gelling disk-like clay particles (Laponite) in water containing 5 mM NaCl. At a Laponite concentration of 10 g/l a gel is formed that does not flow when tilted. The comparison of dynamic light scattering and dynamic mechanical measu