Synthesis and Characterisation of Monodisperse Zirconia Particles

Abstract

Monodisperse spherical ZrO 2 particles were prepared by controlled hydrolysis of zirconium tetraalkoxide in alcoholic solution. Ageing the reaction solution at 60°C for 4 h yields particles with sizes in the range between 200 and 2000 nm. The influence of various ions and surfactants on the final product was investigated. Stable suspensions of coated, monodisperse, zirconia particles were prepared by hydrolysis and subsequent polymerisation of tetraethoxysilane in an alkaline ethanol solution. Thermal analysis revealed that the weight loss of bound water occurred below 400°C and is about 35 %. The phase transition from amorphous zirconia to

Inherently fluorescent and porous zirconia colloids: preparation, characterization and drug adsorption studies

“…The synthesis route described by Widoniak et al 20 was used with modifications. Briefly, a magnetic stirrer with oil bath, glassware, pipettes and reagents were put in a glove box.…”

“…19,20 The process is a multistep reaction as detailed by Widoniak et al 20 after hydrolysis of the metalorganic precursor small crystallites form, whose aggregation provides large secondary particles. The last reaction step is demonstrated by the whitening of the reaction mixture (usually within 1-5 min).…”

“…Spherical m-ZrO 2 are obtained from alkoxide precursors in alcohol after controlled hydrolysis and condensation. [18][19][20] The diameter of these particles is usually over micrometer, and could only be reduced down to a Institute of Materials and Environmental Chemistry, Research Centre for Natural 200 nm by the addition of monovalent metallic cations. 20 For a nano-sized object, the use of a template is necessary, 21,22 however, this involves multi-step preparation.…”

“…[18][19][20] The diameter of these particles is usually over micrometer, and could only be reduced down to 200 nm by the addition of monovalent metallic cations. 20 For a nano-sized object, the use of a template is necessary, 21,22 however, this involves multi-step preparation.In this paper we investigated the possibility of obtaining multifunctional: porous and fluorescent zirconia particles in one single synthetic step that are able to adsorb significant quantity of drug.We intended to induce both porosity and fluorescence in ZrO 2 starting from the method of Widoniak et al 20 where these functionalities were not described. Zhang and coworkers described cetyl trimethylammonium bromide (CTAB) induced fluorescence in ZrO 2 powders.…”

In-situ Synthesis and Normal Chromatographic Properties of Nonporous SiO2/ZrO2 Core-shell Composite Microspheres

“…14 However it is difficult to obtain uniform and monodisperse zirconia microspheres of sub-2 μm diameter, because they easily aggregate during the preparation process. 15 Since sub-2 μm monodisperse silica microspheres can be simply synthesized according to the modifying Stöber method, 16,17 coating ZrO2 nanoparticles on the surface of SiO2 cores would be a good way to prepare monodisperse core-shell SiO2/ZrO2 composite microspheres. 18,19 To the best of our knowledge, no report has been devoted to the preparation of monodisperse SiO2 microspheres coated with ZrO2 crystalline nanoparticles in one step.…”