Polyelectrolyte-Induced Aggregation of Microcrystalline Cellulose: Reversibility and Shear Effects

Flocculation and reflocculation of clay suspension by different polymer systems under turbulent conditions

“…The instrument settings used for this research were: (1) the focal plane of the beam was positioned 20 µm above the sapphire window/solution interface; (2) the data acquisition time was 3 s per data point; (3) there was no signal averaging between data points; (4) there was no data smoothing/averaging between channels. Although the absolute magnitude of the mean chord length cannot be directly compared to the true average particle size, trends and changes observed in the actual particle size distribution are reflected in changes in the mean chord length [13].…”

The Colloidal Probe Technique and its Application to Adhesion Force Measurements

“…This discrepancy may be due to the fact that the fibre surface in paper making is often negatively charged due to adsorption of xylan, which may be essential for the polyelectrolyte-induced aggregation of cellulose. To optimise the conditions for this process, Alfano et al [100] investigated the aggreagation of microcrystalline cellulose mediated by the flocculant cationic poly(acrylamide) (C-PAM) and anionic colloidal silica (ACS) and the mechanism of shear-induced destruction of these aggregates. In this study they used force measurements between silica particles (5 ± 7.5 mm radius) and a mica surface as a model system.…”

Methods and Techniques for Fractal Analysis of Environmental Systems

“…Although the technique has been used to monitor flocculation [72,73], it appears that it has not yet been used to determine the fractal dimension of these systems. This should be a relatively straightforward matter: if one assumes that the instrument samples the aggregates in an unbiased manner, then the same kind of analysis as was applied for the volume obscuration techniques can be used.…”