Séminaire IGE

Nanomaterials for Water Management

vendredi 5 avril 2024 - 13h30
David Riassetto - LGMP
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Wet chemistry synthesis methods include sol-gel chemistry, photoreduction and solvo/hydrothermal synthesis. These methods allow to obtain nanometric thick films, nanoparticles or nanowires. Since these materials are obtained in liquid phase, they can be deposited on all types of substrates in order to induce a new functionality to this support material. Moreover, these methods can be combined to produce surfaces with finely controlled properties. In this seminar, I will show how this fine control can provide technical solutions for water management. For instance, in our group, we have developed approaches to coat any type of surface with SiO2, TiO2 or ZnO. Besides, based on sol–gel route, we formulated and optimized different all- inorganic oxides photo-resists. These photo-resists lead to a single-step lithography (i.e. with only one deposition step) of nanometer-scale thin oxides films, etched with soft solvent (e.g. Ethanol). Such method is compatible with the formation of gratings in the range of the millimeter to the sub- micrometric size on rather large surfaces on top of glass or plastic substrates and was use for making optical chemical waveguide sensor elaborated thru sol-gel method. We have also demonstrated the relationship between the structural properties of a seed layer and the morphology of ZnO nanowires and also developed a method for the synthesis of ZnO nanowires that does not require any seed layer. These nanowires combined with our know-how in functionalization of surfaces whose wettability is controlled, allow us to consider the realization of JANUS membranes. This type of membrane appears to be very promising in order to allow the depollution or desalination of water by membrane distillation. Recently, we started to study the photocatalytic properties of nanowires membranes made with a mixture of Cu2O and ZnO nanowires in order to reach a Z-scheme charge carriers transfer and to reduce CO2, produce hydrogen ...

Equipe organisatrice : Organisation labo

Salle de conférence MCP, IGE MCP, 38400 Saint Martin d'Hères

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