Volodymyr V. Tkach

Modelagem Matemática da Solubilização dos Polímeros Condutores por Meio de Processos Polimeranalógicos

The transition of conducting polymer from insoluble to the soluble state by chemical and electrochemical way, experimentally observed, gains its mathematical representation by means of the developed model, which was described and analyzed by means of linear stability theory and bifurcation analysis. It was shown that the influence on the behavior of the system may come not only of strongly acid media and the presence of surfactants, but also of electrophilic substitution and self-doping. Also, the behavior of the system has been compared by the electrosynthesis of conducting polymers, non-accompanied by solubilization. DOI: http://dx.doi.org/10.17807/orbital.v8i2.621

O Mecanismo do Desempenho Eletroanalítico dos Derivados Triazólicos de Ferroceno e Polímeros Condutores na Eletrodetecção de Fármacos e Pesticidas e a Sua Descrição Matemática

A mechanism was suggested for the electroanalytic function of triazolic ferrocene derivatives in the electrochemical detection of pesticides and drugs, with the emphasis on the behavior of triazole ring. The suggested mechanism was mathematically represented, by form of analysis (by means of linear stability theory and bifurcation analysis) and development of a mathematical model. The result of the modeling has been compared with the result of experimental observations. DOI: http://dx.doi.org/10.17807/orbital.v8i4.690

МАТЕМАТИЧЕСКОЕ ОПИСАНИЕ ЭЛЕКТРОСИНТЕЗА КОМПОЗИТОВ ОКСИ-ГИДРОКСИСОЕДИНЕНИЙ КОБАЛЬТА С ПЕРЕОКИСЛЕННЫМ ПОЛИПИРРОЛОМ В. Ткач, С.С. де Оливейра, Ж. Майя, Б. Гюнтер Соарес, Р. Ожани, П.И. Ягодинец

The mechanism for the electrooxidation of procarbazine in alkaline media has been proposed. The process is realized completely on the electrode surface and is adsorption-controlled. The oscillatory behavior in this case is more probable, than for neutral media and may be caused by the influences of electrochemical oxidation and salt dissolution from the electrode surface.

The mathematical description of the electrochemical behavior during the anodic overoxidation of conductive polymers in strong acid media

The electrochemical behavior of the system with the anodic overoxidation of conducting polymers was described mathematically. The balance equation system describing it was analyzed using the linear stability theory and bifurcation analysis. The stable steady-state conditions and oscillatory instability conditions were found.