Adjustable wetting of Liquid Flame Spray (LFS) TiO2-nanoparticle coated board: Batch-type versus roll-to-roll stimulation methods

Mikko Tuominen, Hannu Teisala, Janne Haapanen, Mikko Aromaa, Jyrki M. Mäkelä, Milena Stepien, Jarkko Saarinen, Martti Toivakka, Jurkka Kuusipalo

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    Superhydrophobic nanoparticle coating was created on the surface of board using liquid flame spray (LFS). The LFS coating was carried out continuously in ambient conditions without any additional hydrophobization steps. The contact angle of water (CAW) of ZrO2, Al2O3 and TiO2 coating was adjusted reversibly from >150° down to ~10−20° using different stimulation methods. From industrial point of view, the controlled surface wetting has been in focus for a long time because it defines the liquid-solid contact area, and furthermore can enhance the mechanical and chemical bonding on the interface between the liquid and the solid. The used stimulation methods included batch-type methods: artificial daylight illumination and heat treatment and roll-to-roll methods: corona, argon plasma, IR (infra red)- and UV (ultra violet)-treatments. On the contrary to batch-type methods, the adjustment and switching of wetting was done only in seconds or fraction of seconds using roll-to-roll stimulation methods. This is significant in the converting processes of board since they are usually continuous, high volume operations. In addition, the creation of microfluidic patterns on the surface of TiO2 coated board using simple photomasking and surface stimulation was demonstrated. This provides new advantages and possibilities, especially in the field of intelligent printing. Limited durability and poor repellency against low surface tension liquids are presently the main limitations of LFS coatings.
    Original languageUndefined/Unknown
    Pages (from-to)271–279
    Number of pages9
    JournalNordic Pulp and Paper Research Journal
    Issue number2
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • Atmospheric plasma treatment (APT)
    • Corona treatment
    • Heat treatment
    • Infrared (IR)
    • Liquid Flame Spray (LFS)
    • Surface stimulation
    • Surface wetting
    • TiO2
    • Ultra violet (UV)

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