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Synthesis and characterization of silver-rich coatings loaded with functionalized clay nanoparticles

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • Published:
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Abstract

A synthetic exfoliated nanoclay smectite type, Laponite® S482, was incorporated as a functionalized load in a silica hybrid matrix synthesized by the sol–gel route. The previous functionalization was carried out through a “grafting” reaction with (3-glycidoxypropyl)trimethoxysilane (GPTMS) assisted by ultrasonic dispersion. The precursor sols were synthesized by acid-catalyzed hydrolytic condensation between tetraethoxysilane (TEOS) and functionalized GPTMS, a silver ions source was added in order to obtain a coating material with controlled silver releasing properties. Coatings were obtained by “dip-coating” on different substrates. Structural characterization of the coatings was conducted by SAXS and SEM-EDS, the results revealed a complex silica matrix with intercalated nanoclays, an organic fraction and a homogeneous content of Ag+. The electrochemical characterization was realized by EIS tests on stainless steel coated substrates AISI 316L type; the results showed good barriers properties and a high integrity of the coatings loaded with nanoclay. The evolution of the release of Ag+ ions was studied by XRF, through exposing the coatings to a leaching process at steady state and determining the residual content of Ag within the coat at different immersion times. It was found that the addition of 1.5 wt. % of clay, in respect to condensed silica, decreased the initial diffusion rate of Ag+ ions at near the half part, allowing its potential use in the development of antibacterial coatings with longer terms of life.

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Acknowledgements

Authors want to acknowledge the Argentine National Council of Scientific and Technical Researches (CONICET, PIP 2012-0434) and the National Synchrotron Light Laboratory of Brazil (LNLS, Project 6780/10, proposal D11A-SAXS1-15291) for the financial supports. In addition, Mr. Martín E. Lere is gratefully acknowledged for his helpful technical collaboration.

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Authors and Affiliations

  1. Instituto de Investigación en Ciencia y Tecnología de Materiales (INTEMA), CONICET-UNMdP, Av. Colón 10850, B7606BVZ, Mar del Plata, Buenos Aires, Argentina

    Hugo Fernando Giraldo Mejía, Raúl Ariel Procaccini & Sergio Antonio Pellice

Authors
  1. Hugo Fernando Giraldo Mejía
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  2. Raúl Ariel Procaccini
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  3. Sergio Antonio Pellice
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Correspondence to Hugo Fernando Giraldo Mejía.

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Highlights

  • Successful incorporation of exfoliated clay nanoparticles in silver-rich hybrid coatings.

  • Obtained hybrid matrices present a spinodal-like bi-continuous structure highly favorable to the Ag+ ions mobility.

  • Incorporation of low amounts of Laponite® S482 limited the superficial agglomeration of silver in the coatings.

  • The addition of clay nanoparticles had a diffusional-control effect on the mobility of Ag+ ions within the hybrid materials.

  • Low concentrations of Laponite® S482 improved the silver releasing behavior and extended the lifespan of the material, allowing a potential antibacterial application.

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Giraldo Mejía, H.F., Procaccini, R.A. & Pellice, S.A. Synthesis and characterization of silver-rich coatings loaded with functionalized clay nanoparticles. J Sol-Gel Sci Technol 85, 529–538 (2018). https://doi.org/10.1007/s10971-018-4600-7

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  • DOI: https://doi.org/10.1007/s10971-018-4600-7

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