A constant current charge/discharge protocol which showed fumed silica filled to the point of incipient wetness with aqueous NaCl solution to have dielectric constants >10⁸ over the full range of dielectric thicknesses of 0.38-3.9 mm and discharge times of 0.25->100 s was studied, making this material another example of a superdielectric. The dielectric constant was impacted by both frequency a...

A method for the polymerization modification of nanoscale fumed silica by crosslinking a lignin layer adsorbed on nanosilica surface under gas dispersion medium is described. mixture phenol and formaldehyde in presence HCl proved to be most effective agent. It has been suggested that molecules occurs mechanism similar production phenol-formaldehyde resins.

Hydrophobic fumed silica (HFS) is a commonly used rheology additive in waterborne coatings. A series of experiments were conducted on the HFS-dispersing technology this study. The size and structure HFS primary particles observed via transmission electron microscopy (TEM). measurement results TEM D50 = 13.6 nm D90 19.7 nm, respectively. particle dispersion performance tested dynamic light scatt...

Dispersions of hydrophilic fumed silica are investigated in a range of polar organic media. The silica forms stable, low-viscosity sols exhibiting shear thickening behavior in a host of liquids, including ethylene glycol and its oligomers and short-chain alcohols, such as n-propanol. In contrast, the silica flocculates into colloidal gels in other liquids, such as glycols with methyl end-caps a...

In this study, a new formulation of silica nanocomposite containing nifedipine (NI) loaded freezedried solid-lipid nanoparticles (NI-SLNs) and silica have been developed with improved flowability of powders, which can lead to the formulation of a widely acceptable oral dosage form. The stable NI-SLNs were prepared using two phospholipids, hydrogenated soybean phosphatidylcholine and dipalmitoyl...

Al2O3:SiOC nanocomposites were synthesized by thermal treatment of fumed alumina nanoparticles modified by phenyltrimethoxysilane. The effect of annealing temperature in inert ambient on structure and photoluminescence of modified alumina powder was studied by IR spectroscopy as well as photoluminescence spectroscopy with ultraviolet and X-ray excitation. It is demonstrated that increase of ann...

Thionines are recalcitrant and polluting textile dyes presenting various degrees of N-methylation. In this paper, a complete series of homologous thionines was used as the substrates for oxidation in the presence of a bioinspired commercial iron-porphyrin immobilized on to imidazole- and pyridine-functionalized fumed silica, to emulate the active site of ligninolytic peroxidases. The obtained c...

Fumed silica has found widespread application in industry due to variety of fascinating properties. Owing its specific manufacturing process, it consists finely dispersed particles and is featured with large surface area covered by profoundly reactive silanol groups which are available for chemical grafting. Spherical shape fumed lacking porosity provides a space-filling structure. These charac...