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Fractal Morphology and Breakage of DLCA and RLCA Aggregates
1Department of Chemical Engineering and Chemical Technology, Imperial College, London, SW7 2BY
Journal of Colloid and Interface Science
|January 7, 2000
Summary
This study characterized latex aggregates using multiple sizing techniques, revealing distinct fractal dimensions for diffusion-limited colloid aggregation (DLCA) and reaction-limited colloid aggregation (RLCA) structures. Turbulent flow disrupted aggregates, while laminar flow promoted growth.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Physical Chemistry
Background:
- Latex aggregates are common in various industrial and biological systems.
- Understanding their morphology and stability is crucial for controlling material properties and processes.
Purpose of the Study:
- To characterize the size distribution and fractal morphology of latex aggregates.
- To investigate the disruption of these aggregates under different flow conditions.
Main Methods:
- Utilized image analysis, laser scattering, and electrical sensing for aggregate characterization.
- Employed dimensional analysis and small-angle light scattering to estimate fractal dimensions.
- Investigated aggregate disruption using laminar and turbulent capillary flow.
Main Results:
- Diffusion-limited colloid aggregation (DLCA) yielded aggregates with a fractal dimension of ~1.8 and a loose structure.
- Reaction-limited colloid aggregation (RLCA) resulted in aggregates with a fractal dimension of ~2.1 and a more compact structure.
- Laminar flow did not disrupt aggregates and even promoted DLCA aggregate growth, while turbulent flow significantly disrupted both DLCA and RLCA aggregates.
Conclusions:
- Fractal dimensions and structural compactness differ significantly between DLCA and RLCA latex aggregates.
- Turbulent flow is effective in disrupting latex aggregates, whereas laminar flow is not and can promote growth.