Preparation and particle size analysis of chromium hydroxide hydrosols of narrow size distributions

Role of Particle Substructure in the Sintering of Monosized Titania

“…This grain structure is desirable because it should be very resistant to grain growth even in dense materials, and it is a useful model system as well. 49 The difference in the grain structure development in two apparently identical gravitational compacts is possibly due to a differences in the relative intraparticle grain growth and interparticle neck growth rates between the two samples. The initial grain growth rate in the sample that lacks "transparticle" grains may be sufficiently rapid to maintain a grain size that is always larger than the interparticle necks.…”

Preparation and characterization of monodispersed metal hydrous oxide sols

“…This information is pertinent in the study of particle nucleation and growth mechanisms. (1). Similar results are obtained if chromium nitrate, chloride, or perchlorate are heated in the presence of a soluble sulfate salt, but not in the absence of sulfate ions; in the latter case these chromium salts solutions produced no sols on aging.…”

Perikinetic Aggregation Induced by Chromium Hydrolytic Polymer and Sol

“…The size of the particles increases with time over about 14 h and when a critical size is reached the particles stop growing (26). This critical diameter slightly depends on the reaction conditions and particularly on the amount of sulfate initially added to the system (27,28). The spherical amorphous particles have a polymeric, gel nature and show a high surface porosity.…”