Hn. Mcmurray, UNIFORM COLLOIDS OF RUTHENIUM DIOXIDE HYDRATE EVOLVED BY THE SURFACE-CATALYZED REDUCTION OF RUTHENIUM TETROXIDE, Journal of physical chemistry, 97(30), 1993, pp. 8039-8045
Hydrosols of ruthenium dioxide hydrate comprising substantially monodi
sperse, spherical, and pristine submicron particles have been synthesi
zed by the reduction of aqueous ruthenium tetroxide. Subsequent to nuc
leation, colloidal particles grow spontaneously by heterogeneously cat
alyzing the reduction of ruthenium tetroxide by water. The kinetics of
the growth process are described and a mechanism proposed whereby par
ticles act as microelectrodes, coupling the anodic oxidation of water
and the cathodic reduction of ruthenium tetroxide. Observed trends in
particle size and size distribution are discussed in relation to the k
inetic law of particle growth.