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 low-adhesive superhydrophobic liquid flame spray (LFS)-generated TiO2 coatings on paper and pigment-coated board substrates using water–ethanol solution as a probe liquid. Submicrometer-scale air gaps, which exist on superhydrophobic surfaces below the liquid droplets, were more stable with the ethanol increment than the larger-scale micrometric air gaps. With the droplet ethanol concentration of 15 wt%, static contact angle as high as 155 ± 2° was measured on the LFS–TiO2-coated board. Transition from the low-adhesive wetting state to the high-adhesive state was demonstrated on the LFS–TiO2-coated paper. The LFS method enables efficient roll-to-roll production of surfaces with special wetting properties on economically viable board and paper substrate materials.
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Acknowledgments
Tekes (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 roll-to-roll web materials.
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This article is part of the Topical Collection on Contact Angle Hysteresis.
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Teisala, H., Tuominen, M., Aromaa, M. et al. High- and low-adhesive superhydrophobicity on the liquid flame spray-coated board and paper: structural effects on surface wetting and transition between the low- and high-adhesive states. Colloid Polym Sci 291, 447–455 (2013). https://doi.org/10.1007/s00396-012-2833-5
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DOI: https://doi.org/10.1007/s00396-012-2833-5