Mesoporous silica LUS-1 (Laval University Silica) was successfully functionalized by propyl sulfonic acid and was used as a recyclable catalyst for the synthesis of acridine-1,8-diones via a pseudo four component reaction of aromatic aldehydes, dimedone and ammonium acetate (or anilines). The excellent yields, short reaction time, simple work-up procedure, and environmentally friendly condition...

It has already been shown that tissue cultures of phagocytic cells may be protected against the toxic effect of silica dust by a number of organic bases and aluminium complexes. These compounds have now been used to treat mice after the administration of silica dust intravenously. Protective activity was measured by capacity to inhibit or retard the development of silicotic nodules in the liver...

A nano-composite powder composed of silica and carbon with a unique property could be prepared from a mixture of a silicate compound and an epoxy compound, in which the silica within the nano-composite powder has a BET surface area of as high as greater than 800m2/g although the nano-composite powder has a BET surface area of less than 10m2/g. It was estimated that the silica and the carbon are...

spherical mesoporous silica mcm-41 was synthesized for adsorptive removal of sulfur compounds from fossil fuels using 1mm solution of dibenzothiophene (dbt) in dodecane as model oil. the prepared silica adsorbent has been characterized by nitrogen adsorption-desorption analysis as well as small angle x-ray scattering (saxs), and transmission and scanning electron microscopy (sem) methods. resul...

Microcrystals of sodium urate produced direct lysis of erythrocyte membranes, as had been described previously for silica. Calcium pyrophosphate crystals induced modest erythrocyte hemolysis, also, and time-course experiments showed a markedly different reaction curve from those produced by silica and urate. Polyvinylpyridine-N-oxide, a strong hydrogen acceptor, was bound from solution to urate...

a simple highly versatile and efficient sonochemical synthesis of 1,2,4,5-tetrasubstituted and 2,4,5-trisubstituted imidazoles is achieved by condensation of 1,2-dicarbonyl compound, aldehyde, ammonium acetate and primary amine using antimony trichloride immobilized on silica gel (sio2-osbcl2) as a catalyst in ethanol at moderate temperature. operational simplicity, practicability and applicabi...

Modern passenger car tire tread compounds usually consist of a polymer blend Solution Styrene-Butadiene Rubber (SSBR) and Butadiene (BR) in combination with silica/silane system. To further enhance the compatibility between nonpolar polar silica, different functional groups can be introduced at end or along chains. The influence such functionalization SSBR BR on processing behavior as well mech...

Abstract Mesoporous silica was prepared using sodium silicate as a precursor and Cetyl Trimethylammonium Bromide (CTAB) templating agent. The adsorption ability of enhanced by DMA (dimethylamine) modifier glycidoxypropyltrimethoxysilane (GPTMS) linking compound. process carried out incorporating the chloride solution into DMA-modified mesoporous silica, followed desorption flowing acid solution...

Millingtonia hortensis is widely distributed tree which belongs to Bignoniaceae family, commonly used as a folk medicine, having anti epileptic, antioxidant, antimicrobial, larvicidal and anticancer activities. In the present study, purification and characterization of bioactive compound(s) from methanolic extract of the leaves of Millingtonia hortensis were carried out using silica gel column ...

Novel chromophoric and fluorescent carbonitrile-functionalized poly(vinyl amine) (PVAm) and PVAm/silica particles were synthesized by means of nucleophilic aromatic substitution of 8-oxo-8H-acenaphtho[1,2-b]pyrrol-9-carbonitrile (1) with PVAm in water. The water solubility of 1 has been mediated by 2,6-O-β-dimethylcyclodextrin or by pre-adsorption onto silica particles. Furthermore, 1 was conve...