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  • 1.
    Harra, Juha
    et al.
    Tampere University of Technology, Finland.
    Tuominen, Mikko
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Juuti, Paxton
    Tampere University of Technology, Finland.
    Rissler, Jenny
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. Lund University, Sweden.
    Koivuluoto, Heli
    Tampere University of Technology, Finland.
    Haapanen, Janne
    Tampere University of Technology, Finland.
    Niemelä-Anttonen, Hanna
    Tampere University of Technology, Finland.
    Stenroos, Christian
    Tampere University of Technology, Finland.
    Teisala, Hannu
    Tampere University of Technology, Finland.
    Lahti, Johanna
    Tampere University of Technology, Finland.
    Kuusipalo, Jurkka
    Tampere University of Technology, Finland.
    Vuoristo, Petri
    Tampere University of Technology, Finland.
    Mäkelä, Jyrki M.
    Tampere University of Technology, Finland.
    Characteristics of nFOG, an aerosol-based wet thin film coating technique2018In: JCT Research, ISSN 1547-0091, E-ISSN 2168-8028, Vol. 15, no 3, p. 623-632Article in journal (Refereed)
    Abstract [en]

    An atmospheric pressure aerosol-based wet thin film coating technique called the nFOG is characterized and applied in polymer film coatings. In the nFOG, a fog of droplets is formed by two air-assist atomizers oriented toward each other inside a deposition chamber. The droplets settle gravitationally and deposit on a substrate, forming a wet film. In this study, the continuous deposition mode of the nFOG is explored. We determined the size distribution of water droplets inside the chamber in a wide side range of 0.1–100 µm and on the substrate using aerosol measurement instruments and optical microscopy, respectively. The droplet size distribution was found to be bimodal with droplets of approximately 30–50 µm contributing the most to the mass of the formed wet film. The complementary measurement methods allow us to estimate the role of different droplet deposition mechanisms. The obtained results suggest that the deposition velocity of the droplets is lower than the calculated terminal settling velocity, likely due to the flow fields inside the chamber. Furthermore, the mass flux of the droplets onto the substrate is determined to be in the order of 1 g/m3s, corresponding to a wet film growth rate of 1 µm/s. Finally, the nFOG technique is demonstrated by preparing polymer films with thicknesses in the range of approximately 0.1–20 µm.

  • 2.
    Karlsson, Mikael
    et al.
    Chalmers University of Technology, Sweden.
    Álvarez-Asencio, Ruben
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Bordes, Romain
    Chalmers University of Technology, Sweden.
    Larsson, Anders
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Taylor, Phil
    AkzoNobel Decorative Paints, UK.
    Steenari, Britt-Marie
    Chalmers University of Technology, Sweden.
    Characterization of paint formulated using secondary TiO2 pigments recovered from waste paint2019In: JCT Research, ISSN 1547-0091, E-ISSN 2168-8028, Vol. 16, no 2, p. 607-614Article in journal (Refereed)
    Abstract [en]

    The paint industry is continuously striving to reduce its environmental impact, especially when it comes to the major virgin white pigment, titanium dioxide (TiO2). In this work, recycled TiO2 pigment was used in a paint formulation as a replacement for pigment made from virgin raw materials. The paint was evaluated based on pH, Stormer and ICI viscosities, gloss, hiding power, and color characteristics. The paint films were also characterized by LVSEM–EDS, AFM, and profilometry. The most significant difference between a paint based on recycled pigments and a paint based on virgin pigments was the agglomeration of pigment particles which gave a reduction in gloss and a rougher surface of the dried paint film based on recycled pigment, and it could be concluded that the recycled pigment could not be used without accepting a small decrease in paint quality. This points toward two main directions: (1) the use of recycled pigment in applications with less demand on surface finish and gloss, such as ceiling paints, and (2) that further work on formulation should be carried out with the recycled pigment as for any other new pigment introduced in a paint formulation to optimize its performance. © 2018, The Author(s).

  • 3.
    Wredenberg, Fredrik
    et al.
    RISE, Swerea, Swerea KIMAB.
    Larsson, P.-L.
    Royal Institute of Technology.
    On the stability of delamination growth at scratching of thin film structures2011In: JCT Research, ISSN 1547-0091, E-ISSN 2168-8028, Vol. 8, no 6, p. 707-717Article in journal (Refereed)
    Abstract [en]

    Scratching of thin film/substrate structures is studied theoretically and numerically. The results are discussed in connection to delamination initiation and in particular subsequent growth at scratching. The material behavior of the film is described by classical elastoplasticity accounting for large deformations. The deformation of the substrate is neglected indicating that the results are pertinent to soft thin films. The numerical investigation is performed using the finite element method (FEM) and the numerical strategy is discussed in some detail. The results from this study show that delamination growth at thin film scratching is a stable feature with crack arrest occurring at a decreasing load. © 2011 ACA and OCCA.

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