Silicon oxide in combination with magnesium chloride is used as a support for the industrial preparation of some types of Ziegler-Natta catalysts. These catalysts are the best candidates for the low pressure production of linear low-density polyethylene and ethylene co-polymers from the gas phase, with improved optical properties in the film form. By many authors silica is believed to act as an...

A simple, precise, accurate and rapid high performance thin layer chromatographic method has been developed for the simultaneous estimation of ondansetron combinations in solid dosage form with omeprazole and rabeprazole, respectively. The method involved separation of components by TLC on a precoated silica gel 60 F(254) using a mixture of dichloromethane:methanol (9:1) as a mobile phase. Dete...

Preparation of Freeze-dried Discs.-Discs, 5 mm. in diameter, were cut from Ford 428 mill coloured blotting paper, and an arbitrary colour was allocated to each test substance for ease of identification (Bowie and Gould, 1952). After sterilizing, each disc was impregnated with a standard drop (0.02 ml.) of a standard solution of test substance appropriate to the colour of the disc. The discs wer...

The rapid separation of inorganic anions was determined by capillary ion chromatography using monolithic silica capillary columns modified with dilauryldimethylammonium bromide. The stability of the modified stationary phase was satisfactory owing to a strong hydrophobic interaction between the lauryl groups of the reagent, even if the eluent did not contain dilauryldimethylammonium ion. Bromid...

The instant thin-layer chromatographic method of determining the radiochemical purity of (99m)Tc-tetrofosmin recommended by the manufacturer uses a mixture of acetone and dichloromethane (35:65 v/v) as the solvent and a silica gel (SG) strip as the solid phase. Currently, SG strips are not available commercially and an alternative solid phase is needed. The present study reports that silicic ac...

In this work Imidazolium Nanoparticle Networks (INNs) with chloride counter-ions were used to complex copper dichloride. This complexation reaction leads to the formation of a green material. The properties of the copper INN material were compared to: first, copper imidazolium complexes, without the presence of silica nanoparticles, which are not thermochromic; second, chloride-containing INN m...

Nano-silica-bonded 3-n-propyl-1-sulfonic acid imidazolium chloride (nano-SB-[PSIM]Cl) was applied as a highly efficient, general and heterogeneous catalyst for one pot multi-component reaction of 2-naphthol, arylaldehydes, and thioacetamide leading to 1-thioamidolakyl-2-naphthols. All reactions proceeded with excellent yields in short times under solvent-free conditions. Our protocol was superi...