a. Responsible: Dr. Sergio A. Pellice
The main objective of this research line concerns to the development of organic-inorganic hybrid coatings obtained from the hydrolytic condensation of organically functionalized silicon alkoxydes. Through the control of the synthesis process the optimization of physicochemical and functional properties is pursued.
As particular objectives arise:
- To develop hybrid organic-inorganic biocidal coatings.
- To develop coatings and membranes with interest in the biotechnological field.
c. Description of ongoing projects
- 1.Development of organic-inorganic hybrid coatings with biocidal properties.
Combination of the sol-gel chemistry, which allows the design and the synthesis of materials with very specific physicochemical properties, with the bactericidal properties of certain additives, as Ag, Cu and Co, make available the innovation in the field of biocidal coatings. Silver is one of the more recognized active agents against bacteria due to its low antimicrobial resistance and its relative low toxicity. By this way, it is possible to provide a barrier to proliferation of microorganisms’ colonies and their undesired consequences, sanitary, economical and esthetic.
Through the use of different synthesis parameters, this research line focuses in the control of two of the main keys related to the efficiency of these materials: the size of the active nanoparticles and the diffusive properties of their surrounding matrix. In order to reach a controlled release rate, the diffusive properties should be dealt through the developed nanostructure. So, the hydrolytic condensation process of different organically functionalized silicon alkoxydes and the incorporation of dense inorganic nanoparticles are two of the main variable to be handled within this research line.
- 2.Development of organic-inorganic hybrid sol-gel membranes and coatings of biotechnological interest through spray deposition.
The purpose of this research line is the optimization and consolidation of the spray deposition method to the development of silica-based hybrid organic-inorganic materials. The spray deposition is a widely used method in the industry due to the low operative costs and other advantages as high speed production, adaptability to complex geometries and its availability to automation processes. Nevertheless, the use of such deposition techniques with the alcohol-based sol-gel solutions is virtually unexplored.
Taking in account the wide possibilities that the sol-gel synthesis opens to the development of functional materials, there is an endless amount of new materials that, at the moment, cannot be commercialized.
d. Collaboration with other research groups of INTEMA
In these research lines a valuable collaboration is given by researchers and students of the Corrosion Division of INTEMA and of the Digital Processing of Images Group (Engineering Department, UNMdP).
a. Transversal image of silver-enriched organic-inorganic hybrid coating on glass substrate.
b. Inhibition halo on Agar diffusion test with an Escherichia coli culture.
Dr. Sergio A. Pellice