Preparation and ion chromatographic properties of a new core-shell chromatographic support Al2O3/SiO2-10

Application of liquid phase deposited titania nanoparticles on silica spheres to phosphopeptide enrichment and high performance liquid chromatography packings

“…However, as the hydrolysis-polycondensation rate of metal-alkoxide is difficult to control, inevitable coating cracks are produced during the process. The molecular layer-by-layer self-assembly technique is based on the electrostatic attraction between charged species deposited [10,34,35], and a variety of solid substrates may be used, such as latex, inorganic compounds, or metals. The coating generated is thermodynamically stable and can bind firmly to substrates.…”

New Support for High-Performance Liquid Chromatography Based on Silica Coated with Alumina Particles

“…[10][11][12][13]21 The alumina gel, covered with a surfactant layer, was added to 20 mL of isooctane under stirring at 100 C and the Na(AOT) layer acted as a "glue" for the incorporation of the alumina particles onto the silica microspheres. After 2 h, 1.50 g of silica microspheres, previously dried at 140 C for 12 h, were directly added to the alumina suspension at 100 C, and the reaction process was kept under continuous stirring for 24 h. The reaction mixture was filtered using a 0.22-μm nylon membrane; the solid material was calcinated at 500 C for 30 min, and washed sequentially with isooctane, toluene, isopropanol, methanol and ultrapurified water.…”

“…7,10,19 One of these techniques is the layer-by-layer self-assembly of metal oxides, or LbL technique, 20 which has resulted in materials with good performance for chromatographic purposes. [10][11][12][13]21 In this technique, the particles of chromatographic support are obtained by the immobilization of a surfactant layer on the silica surface, followed by the incorporation of metal oxide nanoparticles and a calcination step. The resulting material consists of metal oxide nanoparticles deposited on the silica surface independent of the interactive forces between the metal oxide and the silica surface.…”

Preparation, chromatographic evaluation and application of adenosine 5′-monophosphate modified ZrO2/SiO2 stationary phase in hydrophilic interaction chromatography

“…Zirconia (ZrO 2 ), owing to its excellent thermal stability (can withstand high temperature up to 200 • C in chromatographic evaluation [1]), mechanical stability and pH stability (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14), was regarded as a viable alternative chromatographic stationary phase (SP) to silica (SiO 2 ). However, the low column efficiency caused by the undesirable structure, i.e.…”