Epoxy-silica/clay nanocomposite for silver-based antibacterial thin coatings: structure and ionic mobility
| Autor: | Matias Hernan Valdes, Raul Ariel Procaccini, Hugo Fernando Giraldo Mejía, Sergio Antonio Pellice, Emilio Jiménez Piqué |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
Materials science Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry Enginyeria dels materials [Àrees temàtiques de la UPC] complex mixtures 01 natural sciences Coating Electrochemistry General Materials Science Electrical and Electronic Engineering Sol-gel Nanocomposite Nanopartícules Epoxy 021001 nanoscience & nanotechnology Condensed Matter Physics Exfoliation joint 0104 chemical sciences Dielectric spectroscopy Electroquímica Chemical engineering visual_art engineering visual_art.visual_art_medium Grazing-incidence small-angle scattering Nanoparticles 0210 nano-technology |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | A novel material was developed using sol-gel chemistry and an environmental-friendly grafting process of clay nanoparticles. In a previous work of our group, highly compact coatings had been generated using silicon alkoxides, as tetraethoxysilane (TEOS) and 3-glycidoxypropyl-trimethoxysilane (GPTMS), with the incorporation of silver ions and synthetic smectite-type clay nanoparticles, demonstrating antibacterial behaviour against Escherichia coli cultures. By controlling the loading, the exfoliation and the grafting processes of the clay nanoparticles, it was possible to control the migration kinetics of silver ions from the coating matrix to the surface. Morphological and structural studies, through SEM-FIB, revealed the effect of clay nanoparticles leading to the development of a homogeneous structure in 2-µm thickness coatings. Grazing incidence small angle X-ray scattering (GISAXS) experiments demonstrated that silver is distributed in a strongly anisotropic arrangement when clay nanosheets are absent. The size of the silver particles developed on the surface is rather different from that of those developed in the bulk of the coating. Scattering patterns also revealed that the incorporation of clay nanosheets promotes the development of less anisotropic structures. Electrochemical impedance spectroscopy (EIS) measurements confirmed the integrity of the material and the applicability of a physical model with normal distribution of resistive and capacitive elements. |
| Databáze: | OpenAIRE |
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