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| Azevedo, Nuno Monteiro |
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Cros, Stéphane
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Publications (7/7 displayed)
- 2023ALD-grown tin oxide as an electron selective layer for perovskite/silicon tandem cellscitations
- 2023Elucidating Interfacial Limitations Induced by Tin Oxide Electron Selective Layer Grown by Atomic Layer Deposition in N−I−P Perovskite-Based Solar Cellscitations
- 2022Nanocomposite coatings based on polyvinyl alcohol and montmorillonite for high-barrier food packagingcitations
- 2021A machine vision tool for facilitating the optimization of large-area perovskite photovoltaics
- 2014Interlaboratory indoor ageing of roll-to-roll and spin coated organic photovoltaic devices: Testing the ISOS testscitations
- 2014Structural properties of ultraviolet cured polysilazane gas barrier layers on polymer substratescitations
- 2012Optimization of PVA clay nanocomposite for ultra-barrier multilayer encapsulation of organic solar cells.
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article
Nanocomposite coatings based on polyvinyl alcohol and montmorillonite for high-barrier food packaging
Abstract
Art. 790157, 16 S. ; Materials with high barrier properties against oxygen are required for the packaging of many sensitive foods. Since commodity polymers lack these properties, additional barrier materials are used in plastic-based barrier packaging. These are usually more expensive than commodity polymers and, in higher fractions, also make recycling more difficult. Current developments, therefore, aim at barrier layers that are as thin as possible but retain the barrier properties. One approach is to incorporate nanoparticles into these layers. In this study, the barrier properties of nanocomposite coatings, consisting of unmodified polyvinyl alcohol (PVA), and dispersed stick-shaped halloysite (Hal) or platelet-shaped montmorillonite (MMT) silicate nanoparticles, were investigated. The PVA was dissolved in aqueous nanoparticle dispersions, which were prepared by mechanical shearing, to produce the so-called ""nanolacquer."" Nanolacquers with nanoparticle concentrations of 7, 30, and 47 vol% with respect to PVA were applied in a single process step with k-bar on a polypropylene substrate film. The integration of 30 vol% platelet-shaped MMT enhances the barrier performance in comparison to pure PVA by a factor of 12 and 17 for oxygen and helium, respectively. Scanning electron microscopy (SEM) shows a homogeneous distribution and a parallel alignment of the nanoparticles within the coated layer. An increase in the crystallinity of PVA was observed due to the nanoparticle integration as demonstrated by x-ray diffraction (XRD) measurements. The investigation by Fourier transform infrared (FTIR) spectroscopy and the activation energy of the permeation coefficient indicate an interaction between the nanoparticles and the PVA. The theoretically calculated values for barrier enhancement accord well with the experimental values, which emphasizes that the gas barrier improvement for oxygen and helium is mainly dominated by the tortuous path effect. ; 9