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Oxygen scavenging hybrid nanostructure: localization of different iron nanoparticles on montmorillonite clays host

Khederlou, K ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1021/acsomega.2c00286
  3. Publisher: American Chemical Society , 2022
  4. Abstract:
  5. According to the great potential of zero-valent iron nanoparticle applications in the environmental, medical, chemical, packaging and many other industries, there is still a need to tailor their production methods. This study reports the production of a hybrid nanostructure based on iron nanoparticles (INPs) produced in/on montmorillonite (MMT) nanoclays as an oxygen scavenger and barrier additive in polymeric packaging materials of oxygen-sensitive products. INPs and MMT were demonstrated to have effective mutual interactions in which the MMT host played a chemophysical trapping role for iron particles, causing smaller particles around 10 nm with 6.2 g/m2 higher specific surface area by limiting particle growth and agglomeration. In return, the embedding of primary iron cations in/on clays and growth of these particles during the reduction reaction pushed the clay layers out and helped further clay intercalation-exfoliation. Effective study of solvent and primary cation (Fe2+/Fe3+) types showed different preferences in interacting with natural and alkylammonium-modified MMT, resulting in the different site selection. Fe2+ cations preferred to migrate to the interlayer space, whereas Fe3+ cations tended to bond to the clay surface. The obtained results in this study suggest tailoring the ultimate oxygen scavenging capacity, shelf life, and migration properties of a hybrid nanoparticle according to the application requirements. © 2022 The Authors. Published by American Chemical Society
  6. Keywords:
  8. Source: ACS Omega ; 2022 ; 24701343 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsomega.2c00286