Tin– and Titanium–Oxygen Nanostructures on the Various Hydr(oxides) Surfaces

Tin– and titanium–oxygen nanostructures were synthesized by molecular layer-by-layer deposition from the gaseous phase onto various substrates (SnO₂, SiO₂, AlOOH) using (in the course of synthesis) hydroxyl and methoxy surface groups. The electrokinetic (electrokinetic potential, isoelectric point) and adsorption (adsorption of potential-determining ions, the point of zero charge) properties of prepared composites were studied as a function of pH of NaCl background solutions. Synthesis conditions that make it possible to obtain (on the boehmite substrate) nanostructures with electrosurface characteristics similar to the properties of corresponding bulk oxides were determined.     

Electrosurface Characteristics of (Hydr)oxides and Oxide Nanostructures in 1 : 1 Electrolyte Solutions. 3. Calculation of the Electrical Double Layer Parameters for Boehmite, Goethite, and Silicon Oxide According to Adsorption and Electrokinetic Data

The charge components, potentials, and capacities of the electrical double layer are calculated for aluminum, iron, and silicon (hydr)oxides on the basis of adsorption and electrokinetic measurements conducted in NaCl and KCl solutions. The dissociation degrees of surface groups in the point of zero charge and in the isoelectric point are estimated on the basis of the surface reaction constants. The 2-pK model in combination with the Graham model is shown to be applicable for describing the experimental results obtained for the systems in question.     

Colloid chemical characteristics of nanoporous glasses with different compositions in solutions of simple and organic electrolytes. 3. Calculation of electrochemical characteristics of membranes in terms of a homogeneous model

The electrosurface characteristics of nanoporous glass membranes–ion concentrations in pores with taking into account the specificity of counterions, electrokinetically mobile charge, the convective component of pore solution electrical conductivity, electroosmotic mobility of a liquid in the field of streaming potential and ion mobilities in pore space–were calculated within the homogeneous model. The effects of the type of counterion (sodium, potassium, ammonium, tetramethylammonium, and tetraethylammonium ions), solution concentration, glass composition, and pore size on the equilibrium and transport characteristics of membrane systems have been analyzed. A method for the determining of electrolyte activity coefficients in the membranes has been proposed.