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. 2023 Jan 26;15(3):643. doi: 10.3390/polym15030643

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) BC powder, (b) appearance of treated BC suspension from various ultrasound energy, (c) translucent UB-0 film, (d) transparent UB-750 film, (e) bendable UB-750 film, (f) transmittance value of films.