Authors: Hannu Teisala Mikko Tuominen Mikko Aromaa Milena Stepien Jyrki M Mäkelä Jarkko J Saarinen Martti Toivakka Jurkka Kuusipalo
Publish Date: 2012/10/26
Volume: 291, Issue: 2, Pages: 447-455
Abstract
Surface wetting is an important and relevant phenomenon in several different fields Scientists have introduced a large number of applications where special surface wetting could be exploited Here we study wetting phenomena on high and lowadhesive superhydrophobic liquid flame spray LFSgenerated TiO2 coatings on paper and pigmentcoated board substrates using water–ethanol solution as a probe liquid Submicrometerscale air gaps which exist on superhydrophobic surfaces below the liquid droplets were more stable with the ethanol increment than the largerscale micrometric air gaps With the droplet ethanol concentration of 15 wt static contact angle as high as 155 ± 2° was measured on the LFS–TiO2coated board Transition from the lowadhesive wetting state to the highadhesive state was demonstrated on the LFS–TiO2coated paper The LFS method enables efficient rolltoroll production of surfaces with special wetting properties on economically viable board and paper substrate materialsTekes Finnish Funding Agency for Technology and Innovation is acknowledged for the financial support of this study The work was carried out in the Functional Materials 2007–2013 program under the project called Liquid Flame Spray nanocoating for flexible rolltoroll web materials
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