Transparent lignin nanoparticles for superhydrophilic antifogging coatings and photonic films
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-11-01
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Language
en
Pages
16
Series
Chemical Engineering Journal, Volume 475
Abstract
Lignin nanoparticles are useful in multiple applications, but their opaqueness remains an obstacle in optical applications. In this study, we present a method to prepare optically clear lignin nanoparticle dispersions from acetylated lignin. Thin lignin nanoparticle films remained transparent when deposited on glass and other smooth surfaces, and monolayered particle films provided effective antifogging properties. The particles could also be used to prepare multilayered films with bright structural colors that could be controlled via the film-thickness and were retained in dry conditions. We also developed an improved energy- and cost-efficient esterification method for controlled and quick lignin acetylation. The reaction could be selectively controlled to acetylate only aliphatic groups or to also include phenolic groups. We show here that stable nanoparticle dispersions can be produced from acetylated lignin at very high initial lignin concentrations without the formation of aggregates. Both the very short reaction time and high possible lignin concentration make the process industrially feasible as shown with a preliminary techno-economic assessment.Description
Funding Information: This work was a part of the Academy of Finland's Flagship Programme under project Nos. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). KAH thanks FinnCERES for their financial and organizational support. SB’s work was funded through the Aalto University Bioinnovation Center, which was established by a grant of the Jane and Aatos Erkko Foundation, Finland . PN acknowledges funding from the European Union – NextGenerationEU instrument and is funded by the Academy of Finland under grant number 348870 . The authors thank Dr. Heidi Henrickson for proofreading and support in improving overall quality. We thank Dr. Jani Seitsonen for performing ET TEM measurements and for his support and guidance in this area. Publisher Copyright: © 2023 The Author(s)
Keywords
Acetylation, Antifogging, Lignin, LNP, Nanoparticles, Structural color
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Citation
Henn, K A, Babaeipour, S, Forssell, S, Nousiainen, P, Meinander, K, Oinas, P & Österberg, M 2023, ' Transparent lignin nanoparticles for superhydrophilic antifogging coatings and photonic films ', Chemical Engineering Journal, vol. 475, 145965 . https://doi.org/10.1016/j.cej.2023.145965