Atmospheric synthesis of superhydrophobic TiO₂ nanoparticle deposits in a single step using Liquid Flame Spray

Mikko Aromaa, Anssi Arffman, Heikki Suhonen, Janne Haapanen, Jorma Keskinen, Mari Honkanen, Juha-Pekka Nikkanen, Erkki Levänen, Maria E. Messing, Knut Deppert, Hannu Teisala, Mikko Tuominen, Jurkka Kuusipalo, Milena Stepien, Jarkko Saarinen, Martti Toivakka, Jyrki M. Mäkelä

    Research output: Contribution to journalArticleScientificpeer-review

    31 Citations (Scopus)

    Abstract

    Titanium dioxide nanoparticles are synthesised in aerosol phase using the Liquid Flame Spray method. The particles are deposited in-situ on paperboard, glass and metal surfaces. According to literature, titanium dioxide is supposed to be hydrophilic. However, hydrophobic behaviour is observed on paperboard substrates but not on metal or glass substrates. Here, the water contact angle behaviour of the deposits is studied along with XRD, XPS, BET and HR-TEM. The deposits are compared with silicon dioxide deposits having, as expected, hydrophilic properties synthesised with the same method. It seems probable that the deposition process combusts some substrate material from the paperboard substrate, which later on condenses on top of the deposit to form a carbonaceous layer causing the hydrophobic behaviour of the TiO2 deposit. The similar layer does not form when depositing the nanoparticles on a metal or glass surfaces. The observations are more than purely aerosol phenomena. However, they are quite essential in nanoparticle deposition from the aerosol phase onto a substrate which is commonly utilised. (C) 2012 Elsevier Ltd. All rights reserved.
    Original languageUndefined/Unknown
    Pages (from-to)57–68
    Number of pages12
    JournalJournal of Aerosol Science
    Volume52
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Functional coating
    • Liquid Flame Spray
    • Nanoparticle deposition
    • Titanium dioxide

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