4 μm. This also confirms how the nanoporous coating layer compresses in the calendering nip. Figure 5 AFM roughness analysis. From image sizes of (a) 100 × 100 μm2 and (b) 20 × 20 μm2 as a function of the number of calendering nips. Conclusions In summary, we have investigated
the compressibility of TiO2 nanoparticle coatings on paperboard. Our analysis shows that the morphology 4SC-202 cell line of deposited nanoparticle coating undergoes a significant transition even in a single calendering cycle. The surface roughness values are reduced as expected, and nanoparticle coating shows a higher sensitivity for the compression than the reference paperboard. The compression will APR-246 reduce superhydrophobicity as air pockets collapse in nanoporous TiO2 coating under compression as clearly observed from the SEM cross-sectional images. We believe that LFS-deposited nanoparticle coatings will find many applications in the future from controlled wettability to enhanced sensing in surface-enhanced Raman
scattering. Understanding the stability of such nanoparticle coatings is crucial for reproducible and reliable performance of the functional coatings. Acknowledgements This work was supported by the Finnish Funding Agency for Technology and Innovation (Tekes) under the project ‘Liquid flame spray nanocoating for flexible roll-to-roll webmaterials’ (grant no. 40095/11). JJS wishes to thank the Academy of Finland (grant no. 250 122) for the financial support. References 1. Anker JN, Hall WP, Lyandres
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