[Synthesis and evaluation of ethylstyrene-divinylbenzene-coated titania for high performance liquid chromatography]

Ethylstyrene-divinylbenzene-coated TiO2 (ES-DVB-TiO2) was synthesized by at first bonding of vinyltriethoxysilane with hydroxyl group on titania and secondly by addition polymerization of vinyltriethoxysilane and ethylstyrene-divinylbenzene. The hydrophobic selectivity, absolute mobile phase sensitivity, and stability of the stationary phase were evaluated. Finally, several kinds of practical separations were tested on ES-DVB-TiO2. These examples showed that ES-DVB-TiO2 synthesized in our laboratory was a good reversed-phase stationary phase.

[Preparation and chromatographic characteristics of octadecyl bonded titania stationary phase for high performance liquid chromatography]

Porous titania microspheres (surface area: 36.7 m2/g, average pore volume: 0.30 mL/g, average pore diameter: 32.2 nm, average diameter: 3.5 microns) with a very narrow particle size distribution, were synthesized by refluxing polymerized-induced colloid aggregation (PICA), with octadecyltrimethoxysilane in toluene as a solvent for 8 h, and octadecyltitania stationary phase (ODT) was obtained. The carbon content and hydrophobic selectivity of the stationary phase were 2.87% (i.e. 0.66 mumol/m2) and 0.4638, respectively. ODT showed good chromatographic performances when it was used to separate the neutral and basic solutes using methanol solution as a mobile phase.

Synthesis of porous titania microspheres for HPLC packings by polymerization-induced colloid aggregation (PICA)

Porous titania microspheres with a very narrow particle size distribution (PSD) were synthesized by polymerization-induced colloid aggregation (PICA). After being sintered, the titania microspheres that are obtained have an average diameter of 3.5 microm, a surface area of 36.7 m2/g, an average pore volume of 0.30 mL/g, and an average pore diameter of 32.2 nm. The microspheres possess enough rigidity to withstand high packing pressure and are very useful as a new kind of chromatographic packing material for high performance liquid chromatography (HPLC).