Drozdova M. Chemical Analytical Properties of Composite Films Based on Silica Oxide, Surfactants and Cationic polyelectrolytes

The thesis developed and summarized general conditions of analytical application of sol-gel modified composite films based on silica, surfactants and cationic polyelectrolytes in spectrophotometric and voltammetric methods of analysis. The film contained the most hydrophilic polyelectrolyte among tested possessed the best chemical analytical properties. The correlations between nature and concentration of surfactant in silica sol and analytical response of the composite film towards investigated analytes was found and used in practice. It was found synergetic effect of non-ionic surfactant and cation-exchange polyelectrolyte in silica sol on sorption properties of the composite films towards rhodamin 6G, 1,10-phenanthrolinate complexes of Fe(II) and Zn(II). It was shown that hemoproteins (hemoglobin and myoglobin) can be stabilized on the surface of graphite electrode in silica sol-gel film contained organic cation-exchanger аnd surfactant. Both ion-exchange and capsulation mechanism can be used for these purpose. Proposed methods of protein modification especially capsulation are perspective for the development of active element of biosensors. There were developed sorption-spectroscopic methodics of the detection of NO2- using oxidation of rhodamine 6G adsorbed on the composite film, Fe(II) as complex with 1,10-phenanthroline and Zn(II) as Zn-(Phen)2-bengal rose tricomponent complexes with the help of the composite films. The methodics were applied for the analysis of pharmaceutical, environmental objects and food.