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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: 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 J. Saarinen, Martti Toivakka, Jyrki M. Mäkelä
Publisher: ELSEVIER SCI LTD
Publication year: 2012
Journal: Journal of Aerosol Science
Journal acronym: J AEROSOL SCI
Volume number: 52
Start page: 57
End page: 68
Number of pages: 12
ISSN: 0021-8502
eISSN: 1879-1964


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.


Keywords

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

Last updated on 2019-16-10 at 02:55