Particle tracking to reveal gelation of hectorite dispersions |
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Authors: | H A Houghton I A Hasnain A M Donald |
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Institution: | (1) Sector of Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, UK |
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Abstract: | Passive microrheological techniques using particle tracking have been developed for the study of the gelation of hectorite
suspensions. By following the Brownian motion of the particles, it is possible to determine the increasing caging of the particles
with time, as the system gels. Since only the Brownian motion is followed, the gelation process itself should not be affected
by the measurement. As gelation proceeds the increasing heterogeneity of the particle environments can be monitored by a variety
of measures, including kurtosis. An effective viscosity can be extracted from the measurements and used to indicate the gelation
process. |
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Keywords: | 83 80 Hj Suspensions dispersions pastes slurries colloids 47 57 Qk Rheological aspects 61 20 -p Structure of liquids |
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