| Grant number: | 23/03984-3 |
| Support Opportunities: | Regular Research Grants |
| Start date: | October 01, 2023 |
| End date: | September 30, 2025 |
| Field of knowledge: | Engineering - Chemical Engineering |
| Principal Investigator: | Martina Costa Reis |
| Grantee: | Martina Costa Reis |
| Host Institution: | Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| Associated researchers: | Ardson dos Santos Vianna Junior |
| Associated scholarship(s): | 24/04996-8 - Synthesis of chemical gardens through the injection method, BP.TT |
Abstract
Chemical gardens- hollow precipitates with a dendritic aspect formed when a seed of a metallic salt is dropped into an alkaline solution of sodium silicate, sulfate, or carbonate- are the most iconical example of self-organization in chemical systems. Unlike the dissipative structures that emerge from the Belousov-Zhabotinsky and Briggs-Rauscher reactions, chemical gardens are permanent structures thathave been explored in the development of cement, microfluidic devices, and filtration systems. However, although the experimental conditions that lead to the formation of chemical gardens are well-known, there are still no phenomenological models in the literature that explain the formation and growth of the precipitates. In view of this, in this project, a reaction-diffusion model based on the Darcy-Brinkman-Stokes equation will be used to describe how the coupling of non-linear chemical reactions with the diffusive mass transport sets conditions for the formation and growth of chemical gardens. Particularly, the focus will be placed on the interfacial mass transport that causes the thickening of the precipitate walls and the pressure developed inside the hollow precipitates. Moreover, by aiming for possible practical applications in corrosion, microfluidics, and astrobiology, the influence of external fields, such as gravityand electric field, on the growth dynamics of chemical gardens will be investigated through bifurcation analyses of the dissipative structures. The results obtained in this project will be relevant not only for the field of non-equilibrium thermodynamics but also for an emergent research field known as chemobrionicswhose objetive is the study of self-organization processes in precipitation systems by aiming at possible practical applications. (AU)
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