Refractive index shift from liquid to solid in the drying process
Niskanen, Ilpo; Lauri, Janne; Ojala, Satu; Kolli, Tanja; Yokota, Masayuki; Heikkila, Rauno; Fabritius, Tapio
Springer
Niskanen, I., Lauri, J., Ojala, S. et al. Refractive index shift from liquid to solid in the drying process. Opt Rev (2025). https://doi.org/10.1007/s10043-025-00980-1
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© The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
https://creativecommons.org/licenses/by/4.0/
© The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202506034118
https://urn.fi/URN:NBN:fi:oulu-202506034118
Tiivistelmä
Abstract
Understanding the drying kinetics of paints and coatings is crucial in various industrial applications due to their significant impact on reflective properties. This study investigates the dynamic changes in the refractive index of adhesives and varnishes during their transition from liquid to solid states upon drying, while the imaginary part of the refractive index was measured only in the fully dried samples. Our results reveal that the refractive indices of liquid varnishes and lacquers change during the drying process, increasing from 1.382 to 1.5119. Similarly, the refractive indices of adhesives change from 1.440 to 1.452 during drying. The use of refractive index data enhances the optimization of drying process and offers deep insights into the materials’ optical characteristics, crucial for understanding material behavior during drying and its influence on the end-product’s performance.
Understanding the drying kinetics of paints and coatings is crucial in various industrial applications due to their significant impact on reflective properties. This study investigates the dynamic changes in the refractive index of adhesives and varnishes during their transition from liquid to solid states upon drying, while the imaginary part of the refractive index was measured only in the fully dried samples. Our results reveal that the refractive indices of liquid varnishes and lacquers change during the drying process, increasing from 1.382 to 1.5119. Similarly, the refractive indices of adhesives change from 1.440 to 1.452 during drying. The use of refractive index data enhances the optimization of drying process and offers deep insights into the materials’ optical characteristics, crucial for understanding material behavior during drying and its influence on the end-product’s performance.
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