Synthesis of porous zirconia spheres for HPLC by polymerization-induced colloid aggregation (PICA)
- Univ. of Minnesota, Minneapolis, MN (United States)
Porous, spherical zirconia particles with a narrow particle size distribution, which are useful as chromatographic packing materials for high performance liquid chromatography (HPLC), were synthesized by polymerization-induced colloid aggregation (PICA) first described by Iler and McQueston (US Patent 4,010,242, 1977.) and the effects of a number of crucial processing variables were examined. In this method, an aqueous zirconia sol consisting of 700 [angstrom] (mean diameter) particles is mixed with urea and formaldehyde polymer adsorbs onto the ZrO[sub 2] colloids, entraining the colloids in the precipitation of the polymer gel and thus alloying the colloids to aggregate. Features of the aggregation process are elucidated from responses of the process to variations in temperature, reaction mixture composition, and solvent polarity. Results suggest that the aggregation process resembles those reported for the bridging flocculation of colloids by adsorbed polymers. Porous zirconia particles obtained after polymer combustion and sintering of the aggregates are 3.5 [mu]m in diameter with a surface area of 13 m[sup 2]/g, a porosity of 29% and pores ranging from <50 to 350 [angstrom] in diameter. The particles are strong enough to withstand the packing of a HPLC column.
- OSTI ID:
- 7072507
- Journal Information:
- Journal of Colloid and Interface Science; (United States), Vol. 163:2; ISSN 0021-9797
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LIQUID COLUMN CHROMATOGRAPHY
PACKINGS
SYNTHESIS
ZIRCONIUM OXIDES
PHYSICAL PROPERTIES
SOL-GEL PROCESS
CHALCOGENIDES
CHROMATOGRAPHY
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360601* - Other Materials- Preparation & Manufacture