nanoparticle

The regularities of obtaining silver nanoparticles in the presence of polyvinylpyrrolidone, which was both a reductant and a stabilizer of nanoparticle dispersion, have been studied. The influence of such factors as temperature, polyvinylpyrrolidone amount, concentration and nature of silver salts on the shape and size of nanoparticles has been established. The chemistry of the silver salts and polyvinylpyrrolidone reaction with the formation of vinylsuccinimide units in the structure of macromolecules has been proposed, which is confirmed by the results of IR spectroscopy.

A new route to synthesize new nanosized mixed ligand complexes of Zr(IV) have been investigated by the reaction of zirconium(IV) chloride with 3(2'-hydroxyphenyl)-5-(4-substituted phenyl)pyrazolines and ammonium salts of dithiophosphate, which after being treated with H2S gas acts as a precursor for ZrS2. These complexes have been examined for crystalline/amorphous nature through XRD. The morphology of the complexes was studied by employing XRD which shows that all the complexes are amorphous solid.

It has been shown that for curing reaction in fractal space the reaction rate constant reduction is typical. Another typical feature of this reaction is the formation of a large number of microgels with smaller molecular weight in comparison with reaction in Euclidean space at the same conversion degree. The dimensional border between nanoreactor and nanoparticle for the curing reaction under consideration has been obtained.

Structural features of titanium(IV) oxide powder doped with sulphur (S-TiO2) have been determined. Using scanned electronic microscopy, X-ray phase and diffraction analyses the oxide morphology has been studied. Surface composition of S-TiO2 nanoparticles has been examined by X-ray photoelectron and IR-spectroscopy.

Rice husk ash was used to produce sodium silicate with SiO2/Na2O=3. The investigation of NaOH concentration and temperature on the silica conversion showed that NaOH has positive influence. SiO2/Na2O  3 was produced with 0.8 mol/l of NaOH and 403/453 K. These solutions were used to produce silica sol with diameter of 5nm.

The interfacial layer thickness and its elasticity modulus were determined experimentally for particulate-filled polymer nanocomposite. It has been found out that elasticity modulus of interfacial layer is 5 times greater than corresponding characteristic for bulk polymer matrix. It has been shown that the theoretical calculation of interfacial layer thickness within the frameworks of fractal model corresponds well to experimental data.