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. 2023 Dec 15;13:22329. doi: 10.1038/s41598-023-49897-2

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FTIR spectra of film with 2% additives (a,d), films with 2% (b) and 4% (c) SiO₂-rich minerals at the wavenumber of 750–1500 cm⁻¹, and films with 2% (e) and 4% (f) Fe₂O₃-rich minerals at the wavenumber of 400–600 cm⁻¹.