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Homogeneous microscopic bumps generated on λ-carrageenan cast film surface 50643235 井澤, 浩則 イザワ, ヒロノリ Izawa, Hironori 井澤 イザワ Izawa 浩則 ヒロノリ Hironori 宮崎大学 University of Miyazaki Toyoshima, Yuta Toyoshima Yuta Fujiwara, Nana Fujiwara Nana Kawakami, Momoka Kawakami Momoka Tajima, Wataru Tajima Wataru Ifuku, Shinsuke Ifuku Shinsuke open access © 2024 Elsevier B.V. All rights reserved. λ-Carrageenan Bumps Water evaporation Cast film Self-organization Here we investigate the phenomenon of bump formation on λ-carrageenan (CG). In this phenomenon, microscopic bumps (ca. 2.8 µm wide and ca. 0.4 µm high) form on the surface of λ-CG cast film created by evaporating a 1.0 wt% λ-CG solution in a PTFE petri dish at 60 ºC. We observe that the size of the bumps can be controlled by adjusting the concentration and volume of the λ-CG solution, and this is correlated with the film thickness. Specifically, as the film thickness increases, the size of the bumps also increases with strong correlation. We also investigate the mechanism underlying bump formation. We find that bumps form by complete drying and that the λ-CG film exhibits less-adhered inner layers with periodic curves resembling the bumps. These results suggest the curved layer structure is related to the formation mechanism. In other words, the drying shrinkage strain is relieved on each layer through curving, leading to the generation of bumps on the free surface. Therefore, we hypothesize that the fundamental mechanism behind the formation of these bumps lies in the self-organization of λ-CG, which results in the creation of an adhesion-less layered structure during the cast film formation process. Citeation: Hironori Izawa, Yuta Toyoshima, Nana Fujiwara, Momoka Kawakami, Wataru Tajima, Shinsuke Ifuku, Homogeneous microscopic bumps generated on λ-carrageenan cast film surface, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 690, 133853, 2024, 10.1016/j.colsurfa.2024.133853. Elsevier 2024-06-05 eng journal article AM http://hdl.handle.net/10458/0002000904 https://miyazaki-u.repo.nii.ac.jp/records/2000904 https://doi.org/10.1016/j.colsurfa.2024.133853 1873-4359 0927-7757 Colloids and Surfaces A: Physicochemical and Engineering Aspects 690 133853 https://miyazaki-u.repo.nii.ac.jp/record/2000904/files/CollSurfA_Ms_rev_unmarked.pdf application/pdf 1.3 MB 2025-06-05