Physics – Condensed Matter – Materials Science
Scientific paper
1998-09-11
J. Colloid and Interface Sci. 213 (1999) 36-45
Physics
Condensed Matter
Materials Science
38 pages in plain TeX and 7 JPG figures
Scientific paper
10.1006/jcis.1999.6106
It has been experimentally established in numerous cases that precipitation of monodispersed colloids from homogeneous solutions is a complex process. Specifically, it was found that in many systems nuclei, produced rapidly in a supersaturated solution, grow to nanosize primary particles (singlets), which then coagulate to form much larger final colloids in a process dominated by irreversible capture of these singlets. This paper describes a kinetic model that explains the formation of dispersions of narrow size distribution in such systems. Numerical simulations of the kinetic equations, with experimental model parameter values, are reported. The model was tested for a system involving formation of uniform spherical gold particles by reduction of auric chloride in aqueous solutions. The calculated average size, the width of the particle size distribution, and the time scale of the process, agreed reasonably well with the experimental values.
Goia Dan V.
Matijevic Egon
Park Jongsoon
Privman Vladimir
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