Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Clustering of Binary Colloidal Suspensions: Experiment MEHRDAD YASREBI, WAN Y. SHIH, AND ILHAN A. AKSAY
 

Summary: Clustering of Binary Colloidal Suspensions: Experiment
MEHRDAD YASREBI, WAN Y. SHIH, AND ILHAN A. AKSAY
Department of Materials Science and Engineering and Advanced Materials Technology Center,
Washington Technology Centers, University of Washington, Seattle, Washington 98195
Received April 25, 1989; accepted August 24, 1990
The stability of binary colloidal suspensions is examined and compared to that of particle-polymer
systems. In particle-polymer systems, it is known that the addition of free polymers within a concentration
range of polymers to a stabilized dispersion leads to flocculation. Similar to particle-polymer systems,
we have observed that in binary colloidal suspensions, particles of the first kind can be induced to
flocculate by the presence of particles of the second kind, within a certain range of concentration of the
second kind of particles. Moreover, we have observed the growth of clusters of particles 1 at a later time
in the initially restabilized regime. This slow growth of clusters in the initially restabilized suspensions
is associated with the slowing of particle movement due to higher particle 2 concentrations. The aging
phenomenon (growth of clusters) that occurs at high particle 2 concentrations clearly indicates that the
seemingly restabilized suspension at high particle 2 concentrations is not due to thermodynamics, but
to slow kinetics associated with slow particle movements at high densities. A similar aging phenomenon
was observed with a particle-polymer (c~-A1203/PAA) system in the seeming restabilization regime at
high polymer concentrations. I991AcademicPress,Inc.
I. INTRODUCTION
The phenomenon of flocculation of colloi-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science