the preparation and characterization of the vinyltriethoxysilane-modified silica nanoparticles were investigated. also the surface tension of polystyrene, native (hydrophilic) silica and silane-modified (hydrophobic) silica were determined. two kinds of polystyrene/silica (treated and non-treated) nanocomposites were prepared with different filler loadings by solution method. their viscoelastic...

Vesicular karyomegaly of the liver hepatocytes is described from Baryancistrus sp. (Loricaridae), in 3 out of 7 fish, collected from Rio Xingu in central Amazonian (neutral water) Brazil and kept about 2 wk in a holding facility fed with acid water (pH 5.0 to 5.5). Altered cells also occurred in the gill epithelium. The vesicles in the liver were shown to contain a periodic acid-Schiff (PAS)-po...

This review describes the present state of science and technology of photopolymerizable (UV-curable) polyurethane (PU) nanocomposites which include nanosilica and organically-modified clay (organoclay). A number of documented improvements of properties of PU nanocomposites compared to the pristine PU are presented. Many data on the structure and properties of PU nanocomposites were obtained not...

In the reported work, wool fabric was coated with epoxy resin by hand layup method to fabricate wool-epoxy composites. Hydrophobic nanosilica used as a filler improve their mechanical characteristics. The physico-mechanical properties of composites were analyzed using various analytical techniques. surface morphology examined aid Scanning Electron Microscope. biodegradability developed determin...

In the present investigation it has been found that the ability of deoxycorticosterone and corticosterone to produce the theoretical amount of formaldehyde when treated with periodic acid is unimpaired by previous treatment with hot dilute mineral acids. The ability of cortisone to react with periodic acid to produce formaldehyde is reduced to negligible proportions by such treatment. As a resu...