| Grant number: | 06/04636-3 |
| Support type: | Scholarships in Brazil - Master |
| Effective date (Start): | March 01, 2007 |
| Effective date (End): | February 28, 2009 |
| Field of knowledge: | Physical Sciences and Mathematics - Chemistry |
| Principal researcher: | Hamilton Brandão Varela de Albuquerque |
| Grantee: | Raphael Nagao de Sousa |
| Home Institution: | Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil |
Abstract Spatio-temporal pattern formation in reaction-transport systems has becoming a very active research area. Complex behavior in these systems takes place under far from thermodynamical equilibrium conditions and results from the interplay between nonlinear temporal dynamics and transport properties. Due to some properties of lateral information exchange and easy global control, reaction-migration systems at the solid/liquid interface are considered ideal model systems. It is proposed in this projet the experimntal study of the oscillatory dynamics associated to the electrooxidation reaction of formic acid on platinum surfaces. The experiments will be performed in sulphuric, phosforic and perchloric acid aqueous solutions perturbed by the presence of small amounts of tetrafluoroborate, hexafluorophosphate, and trifluoromethanesulphonate anions. The key aspects of the systems temporal dynamics will be investigated by means of usual electrochemical techniques and also in terms of gravimetric studies with the electrochemical quartz crystal nanobalance. From the spatio-temporal point of view, the experiments will be carried out with a set of sixty four platinum electrodes kept under global control and in which the individual currents will be be independently followed by means of a multichanel data acquisition system. An anular one-dimentional arrangement will be initially adopted and the dynamic investigated under the influence of negative global coupling. | |