OSCILLATIONS pH IN THE Salt – H2O – OH– SYSTEMS

Abstract

The synthesis of Thin films by using thioamides and salts at the presence of alkali is usually carried out by mixing the two solutions. The first solution (A) contains the salt and alkali and the second thioamide (B).Before mixing, the solutions could be in the state which sufficiently far from true equilibrium that may lead to irreproducible results after mixing the solutions.The deviation from the true equilibrium is determined by the “memory” effects of solution and the possibility of the system state at the “oscillation mode”, in addition to the above effects, the film properties depend on the concentration of reactants and temperature solutions.Thus, study of state of the solution A before mixing with the solution B at beginning of kinetic process of formation lead sulfide is interesting to achieve reproducible results in the synthesis of films PbS.