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Knut Deppert

Knut Deppert

Professor

Knut Deppert

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

Author

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

Summary, in English

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.

Department/s

  • Solid State Physics
  • Nanometer structure consortium (nmC)-lup-obsolete
  • NanoLund

Publishing year

2012

Language

English

Pages

57-68

Publication/Series

Journal of Aerosol Science

Volume

52

Document type

Journal article

Publisher

Elsevier

Topic

  • Condensed Matter Physics

Keywords

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

Status

Published

Research group

  • Nanometer structure consortium (nmC)-lup-obsolete

ISBN/ISSN/Other

  • ISSN: 0021-8502