title: Compressibility of porous TiO2 nanoparticle coating on paperboard.
abstract: Compressibility of liquid flame spray-deposited porous TiO2 nanoparticle coating was studied on paperboard samples using a traditional calendering technique in which the paperboard is compressed between a metal and polymer roll. Surface superhydrophobicity is lost due to a smoothening effect when the number of successive calendering cycles is increased. Field emission scanning electron microscope surface and cross‒sectional images support the atomic force microscope roughness analysis that shows a significant compressibility of the deposited TiO2 nanoparticle coating with decrease in the surface roughness and nanoscale porosity under external pressure. PACS: 61.46.-w; 68.08.Bc; 81.07.-b.
authors.forename: Milena
authors.initials: M
authors.lastname: Stepien
authors.affiliation: Laboratory of Paper Coating and Converting, Center for Functional Materials, Åbo Akademi University, Porthansgatan 3, Turku FI-20500, Finland. jarkko.j.saarinen@abo.fi.
authors.forename: Jarkko J
authors.initials: JJ
authors.lastname: Saarinen
authors.forename: Hannu
authors.initials: H
authors.lastname: Teisala
authors.forename: Mikko
authors.initials: M
authors.lastname: Tuominen
authors.forename: Janne
authors.initials: J
authors.lastname: Haapanen
authors.forename: Jyrki M
authors.initials: JM
authors.lastname: Mäkelä
authors.forename: Jurkka
authors.initials: J
authors.lastname: Kuusipalo
authors.forename: Martti
authors.initials: M
authors.lastname: Toivakka