Within IRDL, Hamza Issa explored anisotropic diffusion in colloidal suspensions and its industrial implications.
Hamza Issa, chercheur·e au sein de IRDL (Institut National Polytechnique de Bretagne).
Thèse soutenue en 2023 à l'école doctorale École doctorale Sciences Pour l'Ingénieur (Lorient ; 2022-....).
Référencée dans le réseau ABES/STAR, cette thèse répond aux critères de rigueur de l'enseignement supérieur français.
Research on colloidal suspensions, particularly those containing anisometric particles, is of increasing relevance in various industrial sectors. These suspensions, which consist of solid particles dispersed in a liquid, are ubiquitous in applications ranging from paint to food, as well as composite materials and biomedical systems. Hamza Issa, within IRDL, has conducted an in-depth study on anisotropic translational diffusion, highlighting complex mechanisms that govern the behavior of these particles in fluids. This thesis is not limited to a simple theoretical exploration; it proposes kinetic models and numerical simulations to understand how the concentration and orientation of particles influence their dynamics.
The results obtained reveal similar concentration profiles for different strains of bacteria in channels of 100µm in height. This could have significant implications for controlling biofouling, a phenomenon that incurs considerable costs in sectors such as marine, where the accumulation of organisms on ship hulls can affect performance and durability. Indeed, understanding the interactions between active and passive particles paves the way for innovative solutions for antifouling coatings and biological control agents targeting specific microorganisms. For example, the use of anisometric particles in marine paint formulations could create surfaces more resistant to biofilm accumulation, thereby improving the energy efficiency of ships.
The implications of this research go beyond simple modeling. The findings suggest potential improvements in advanced material manufacturing methods by optimizing the concentration and orientation of particles in suspensions. This could transform how industries approach the design of new materials by integrating specific fluid properties that meet particular needs. For instance, in the electronics sector, optimized colloidal suspensions could be used to develop flexible screens or more efficient energy storage devices.
However, it is crucial to ask certain questions: how can these discoveries be implemented in concrete applications? What challenges must be overcome to integrate these models into existing industrial processes? Hamza Issa's research offers avenues for reflection, but it also calls for close collaboration between researchers and industry to maximize the impact of these advancements. Challenges include the need to validate these models in real industrial environments, where operating conditions may differ significantly from those in laboratories.
In summary, this thesis contributes to a better understanding of colloidal systems, with significant implications for various industrial and environmental applications. Hamza Issa's research, validated by the ABES/STAR network, demonstrates academic rigor and application potential in diverse sectors. By integrating this new knowledge, industries could not only improve their products but also reduce their environmental impact by developing more sustainable and efficient solutions.
Thus, research on anisotropic translational diffusion in colloidal suspensions is not merely a scientific advancement; it represents a transformative opportunity for many sectors, especially in a context where innovation and sustainability have become essential priorities.
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Sources et accès
Hamza Issa. Anisotropic translational diffusion in passive and active colloidal suspensions : Rheology and complex flows. Fluids mechanics [physics.class-ph]. Université de Bretagne Sud, 2023. English. ⟨NNT : 2023LORIS683⟩. ⟨tel-04885923⟩