| Rheological Behaviour of Silicic Acid Sol in Relation
to Interaction with Certain Cations |
M. K. Naskar, M. Chatterjee and D. Ganguli
Pages : 12-16
DOI : 10.1080/0371750X.2002.10800010 |
| Abstract |
| Rheological behaviour of silicic acid sols with and without different
cations (e.g., Pb2, Zn2
, All+ and Zr4
) was studied by
steady shear and oscillatory flow measurements at different ageing
periods. From the steady shear flow curves, the changes in
viscosity, area of hysteresis of the flow curves and the yield
stress were measured with ageing time of the sols. A sharp
change of the above parameters (e.g., viscosity, area of hysteresis
of the flow curves and yield stress) occurred after a certain
time of ageing. It indicated qualitatively the point of gelation of
the sols. The gel point of the sols could be quantitatively measured
from their oscillatory flow measurement. From the above
results it was observed that gel po:nt (the time of gelation) increased
in the order of Pb2
|
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