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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom


IMPACT FACTOR 2018: 0.929
5-year IMPACT FACTOR: 1.255

CiteScore 2018: 0.92

SCImago Journal Rank (SJR) 2018: 0.386
Source Normalized Impact per Paper (SNIP) 2018: 0.585

Online
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2000-0669
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Volume 29, Issue 2

Issues

Adjustable wetting of Liquid Flame Spray (LFS) TiO2-nanoparticle coated board: Batch-type versus roll-to-roll stimulation methods

Mikko Tuominen
  • Corresponding author
  • Paper Converting and Packaging Technology, Tampere University of Technology, P.O.Box 589, FI-33101 Tampere, Finland
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/ Hannu Teisala
  • Paper Converting and Packaging Technology, Tampere University of Technology, P.O.Box 589, FI-33101 Tampere, Finland
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/ Janne Haapanen / Mikko Aromaa / Jyrki M. Mäkelä / Milena Stepien
  • Laboratory of Paper Coating and Converting and Center of Functional Materials, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland
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/ Jarkko J. Saarinen
  • Laboratory of Paper Coating and Converting and Center of Functional Materials, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland
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/ Martti Toivakka
  • Laboratory of Paper Coating and Converting and Center of Functional Materials, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland
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/ Jurkka Kuusipalo
Published Online: 2018-11-01 | DOI: https://doi.org/10.3183/npprj-2014-29-02-p271-279

Abstract

Superhydrophobic nanoparticle coating was created on the surface of board using liquid flame spray (LFS). The LFS coating was carried out continuously in ambient conditions without any additional hydrophobization steps. The contact angle of water (CAW) of ZrO2, Al2O3 and TiO2 coating was adjusted reversibly from >150° down to ~10−20° using different stimulation methods. From industrial point of view, the controlled surface wetting has been in focus for a long time because it defines the liquid-solid contact area, and furthermore can enhance the mechanical and chemical bonding on the interface between the liquid and the solid. The used stimulation methods included batch-type methods: artificial daylight illumination and heat treatment and roll-to-roll methods: corona, argon plasma, IR (infra red)- and UV (ultra violet)-treatments. On the contrary to batch-type methods, the adjustment and switching of wetting was done only in seconds or fraction of seconds using roll-to-roll stimulation methods. This is significant in the converting processes of board since they are usually continuous, high volume operations. In addition, the creation of microfluidic patterns on the surface of TiO2 coated board using simple photomasking and surface stimulation was demonstrated. This provides new advantages and possibilities, especially in the field of intelligent printing. Limited durability and poor repellency against low surface tension liquids are presently the main limitations of LFS coatings.

Keywords: Liquid Flame Spray (LFS); TiO2; Surface wetting; Surface stimulation; Ultra violet (UV); Infrared (IR); Heat treatment; Atmospheric plasma treatment (APT); Corona treatment

About the article

Received: 2013-08-19

Accepted: 2014-01-22

Published Online: 2018-11-01

Published in Print: 2014-05-01


Citation Information: Nordic Pulp & Paper Research Journal, Volume 29, Issue 2, Pages 271–279, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.3183/npprj-2014-29-02-p271-279.

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