Khederlou Khadijeh, Bagheri Reza, Shojaei Akbar, Gontard Nathalie, Tamsilian Yousef
Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 13537-13331, Iran.
Department of Materials Science and Engineering, Sharif University of Technology, Tehran 13537-13331, Iran.
ACS Omega. 2022 May 4;7(19):16391-16401. doi: 10.1021/acsomega.2c00286. eCollection 2022 May 17.
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/m 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 (Fe/Fe) types showed different preferences in interacting with natural and alkylammonium-modified MMT, resulting in the different site selection. Fe cations preferred to migrate to the interlayer space, whereas Fe 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.
鉴于零价铁纳米颗粒在环境、医学、化学、包装及许多其他行业中的应用潜力巨大，仍需调整其生产方法。本研究报告了一种基于在蒙脱石（MMT）纳米粘土中/上制备的铁纳米颗粒（INPs）的混合纳米结构的生产，该结构可作为对氧气敏感产品的聚合物包装材料中的氧清除剂和阻隔添加剂。已证明INPs和MMT之间存在有效的相互作用，其中MMT主体对铁颗粒起到化学物理捕获作用，通过限制颗粒生长和团聚，形成了约10 nm的较小颗粒，比表面积提高了6.2 g/m²。作为回报，初级铁阳离子在粘土中/上的嵌入以及这些颗粒在还原反应过程中的生长将粘土层推开，并有助于进一步的粘土插层-剥离。对溶剂和初级阳离子（Fe²⁺/Fe³⁺）类型的有效研究表明，它们在与天然和烷基铵改性的MMT相互作用时表现出不同的偏好，从而导致不同的位点选择。Fe²⁺阳离子倾向于迁移到层间空间，而Fe³⁺阳离子则倾向于与粘土表面结合。本研究获得的结果表明，可根据应用要求调整混合纳米颗粒的最终氧清除能力、保质期和迁移特性。
