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Title: Studies on kinetic behaviour of colloidal dispersion of Mg-Al hydrotalcite-like compounds
Authors: Jin, Z L
Hou, W G
Sun, D J
Zhang, C G
Issue Date: Mar-2006
Publisher: NISCAIR-CSIR, India
Abstract: The aggregation kinetics of dispersion of Mg-Al hydrotalcite- like compounds (HTlc) at various KCl concentrations (CKCl) has been investigated by dynamic light scattering, electrophoresis and interaction energy calculations. In the three different regimes that are observed, the phenomena of stability or aggregation upon addition of electrolyte have been characterized as mostly stable, slow aggregating and fast aggregating, respectively. In the range of 0 < CKCl < 20 mM. The mean hydrodynamic diameter (dmean) initially decreases slightly, and then increases slowly with increasing ionic strength and thus the colloidal dispersion can be considered as stable. In the range of 20 < CKCl < 205 mM, aggregation rate increases with the increase of  CKCl , indicating that this regime is a slow aggregation regime, In the range of CKCl˃ 205 mM,  the aggregation rate reaches a maximum, showing it to be a fast aggregation regime where the aggregation rate constant is independent of the electrolyte concentration. The stability ratio in fast aggregation regime is higher than unity, The critical electrolyte concentration for the Mg-Al HTlc sample is found to be 205 mM.
Page(s): 609-613
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.45A(03) [March 2006]

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