In this work we study the kinetics of coagulation of monodisperse
spherical colloids in aqueous suspension
at the early stage of coagulation. We have performed the
measurements on a multiangle static and
dynamic light scattering instrument using a fiber-optics-based
detection system which permits simultaneous
time-resolved measurements at different angles. The absolute
coagulation rate constants are determined
from the change of the scattering light intensity as well as from the
increase of the hydrodynamic radius
at different angles. The combined evaluation of static and dynamic
light scattering results permits the
determination of coagulation rate constants without the explicit use of
light scattering form factors for the
aggregates. For different electrolytes fast coagulation rate
constants were estimated. Stability curves
were measured as a function of ionic strength using different particle
concentrations.
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