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Design of Waterborne Nanoceria/Polymer Nanocomposite UV-Absorbing Coatings: Pickering versus Blended Particles

Martín-Fabiani, Ignacio, Koh, Ming Liang, Dalmas, Florent, Elidottir, Katrin, Hinder, Steven J., Jurewicz, Izabela, Lansalot, Muriel, Bourgeat-Lami, Elodie and Keddie, Joseph L. (2018) Design of Waterborne Nanoceria/Polymer Nanocomposite UV-Absorbing Coatings: Pickering versus Blended Particles ACS Applied Nano Materials, 1 (8). pp. 3956-3968.

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Nanoparticles of cerium dioxide (or nanoceria) are of interest because of their oxygen buffering, photocatalytic ability, and high UV absorption. For applications, the nanoceria can be incorporated in a polymer binder, but questions remain about the link between the nanoparticle distribution and the resulting nanocomposite properties. Here, the thermal, mechanical and optical properties of polymer/ceria nanocomposites are correlated with their nanostructures. Specifically, nanocomposites made from waterborne Pickering particles with nanoceria shells are compared to nanocomposites made from blending the equivalent surfactant-free copolymer particles with nanoceria. Two types of nanoceria (protonated or citric acid-coated) are compared in the Pickering particles. A higher surface coverage is obtained with the protonated ceria, which results in a distinct cellular structure with nanoceria walls within the nanocomposite. In the blend of particles, a strong attraction between the protonated nanoceria and the acrylic acid groups of the copolymer likewise leads to a cellular structure. This structure offers transparency in the visible region combined with strong UV absorption, which is desired for UV blocking coating applications. Not having an attraction to the polymer, the citric acid-coated nanoceria forms agglomerates that lead to undesirable light scattering in the nanocomposite and yellowing. This latter type of nanocomposite coating is less effective in protecting substrates from UV damage but provides a better barrier to water. This work shows how the nanoparticle chemical functionalization can be used to manipulate the structure and to tailor the properties of UV-absorbing barrier coatings.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Martín-Fabiani, Ignacio
Koh, Ming Liang
Dalmas, Florent
Hinder, Steven J.
Lansalot, Muriel
Bourgeat-Lami, Elodie
Keddie, Joseph
Date : 24 August 2018
Funders : European Union Seventh Framework Programme
DOI : 10.1021/acsanm.8b00736
Grant Title : BARRIER-PLUS project (FP7-SME-2012-2)
Copyright Disclaimer : Copyright 2018 American Chemical Society
Uncontrolled Keywords : Ultraviolet absorption; Film formation; Pickering; Coatings; Cerium dioxide; Nanocomposites
Depositing User : Clive Harris
Date Deposited : 24 Jul 2018 14:32
Last Modified : 19 Jul 2019 02:08

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