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    Surface chemical characterization of nanoparticle coated paperboard

    Year: 2011

    Journal: Applied surface science 2012 258 (7) pp 3119-3125, 20121211

    Authors: Milena Stepien, Jarkko J. Saarinen, Hannu Teisala, Mikko Tuominen, Mikko Aromaa, Jurkka Kuusipalo, Jyrki M. Mäkelä, Martti Toivakka

    Organizations: Laboratory of Paper Coating and Converting, Center for Functional Materials, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo/Turku, Finland; Paper Converting and Packaging Technology, Department of Energy and Process Engineering, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland; Aerosol Physics Laboratory, Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland

    The chemical composition of nanoparticle coated paperboard surfaces was characterized. The deposition of SiO2 and TiO2 nanoparticles induced changes in wetting properties of the paperboard surface: a superhydrophilic surface was created by SiO2 nanoparticles and a superhydrophobic surface by TiO2 nanoparticles. Both X-ray photoelectron spectroscopy (XPS) and contact angle (CA) measurements were used to study the surface properties of the samples. The low and high resolution XPS spectra were collected to evaluate the chemical composition before and after nanoparticle deposition. The SiO2 nanocoated sample has the highest values of both O to C and C2 to C1 ratios, which indicates a high relative amount of hydroxyl groups. On the other hand, carbon C1 peak which represents the hydrocarbon type of bonds, is on higher level for TiO2 when compared to the SiO2 nanocoated sample. This may be related to the replacement of hydroxyl groups by aliphatic chains on the superhydrophobic surface of TiO2 nanoparticle coated sample.