reactions couple to transport properties through a nonlinear dynamics
that can yield complex spatio-temporal structures on both macroscopic
and microscopic scales. Beautiful patterns are observed in convection
fluids, flames, oscillating reactions, morphogenesis, precipitate systems...
Propagation of waves of chemical activity characterize certain physiological
processes such as nerve transmission and cardiac rhythmic function.
We study such exotic phenomena in physico-chemical systems both theoretically
and experimentally. We carry out experiments to explore new systems
and new behavior, notably pattern formation in precipitate systems,
and tree-like ramified structures in metal electrodeposition systems.
The latter are studied from the viewpoint of fractal analysis. We also
attempt to unravel the similarities between the geochemical self-organization
(band and stripe formation in rocks) and the periodic precipitation
observations (Liesegang banding). Finally, we try to interpret the observed
behavior by modeling the reaction-diffusion/other transport equations
that underlie the dynamics of those systems.