Chemical control in precipitation of spherical zirconia particles

Synthesis and characterization of substituted salicylate zirconium compounds and their catalytic activity over ε-caprolactone

“…This formula of ion showed that compound was dimeric as supported by elemental analysis and 1 H-NMR result. However, the similar reaction between zirconium propoxide and salicylate was formulated as Zr 10 O 6 (OH) 4 (OOC-C 6 H 4 OH) 8 (OOC-C 6 H 4-O) 8 .6PrOH by U. Schubert et al [10]. The complexation of zirconium precursor with carboxylate groups in different formula depends on a few parameters such as carboxylate/ zirconium alkoxide ratio, reaction time, and solvents.…”

“…The complexing carboxylate ligands such as methacrylate, chloro acetate, 3-pentenoate, perfluoroheptanoate, butynoate, phthalate, pyridine-2-carboxylate or related ligands have often been reported in the literature as chemical additives to regulate the reactivity of zirconium alkoxides [1][2][3][4][5][6][7][8]. When some of the alkoxide groups are substituted by carboxylate groups, a new molecular precursor can be obtained which exhibits a different molecular structure and reactivity.…”

Synthesis of Nimesulide Nanoparticles in the Microemulsion Epikuron/Isopropyl Myristate/Water/n-Butanol (or Isopropanol)

“…In this case, the thermodynamic stabilization determines the size of the particles. A cleanup example was shown for the formation of monodisperse spherical zirconia particles (27). These are precipitated by hydrolysis of alcoholic solutions of zirconium alkoxides in the presence of long-chain carboxylic acids.…”

The separation of diastereoisomers of polystyrene oligomers in reversed phase HPLC

“…To a certain degree modification of the zirconia surface masks the underlying effects of the Lewis acid/ base and Bronsted base sites. Zirconia stationary phases are rigid in structure and can be prepared in almost monodisperse particle size distributions similar to that of silica [4,18]. The pore structure has also been shown to be controllable during the synthesis [19 26].…”