University of Oulu

Niu, H., Zhang, K., Myllymäki, S., Ismail, M. Y., Kinnunen, P., Illikainen, M., & Liimatainen, H. (2021). Nanostructured and advanced designs from biomass and mineral residues: Multifunctional biopolymer hydrogels and hybrid films reinforced with exfoliated mica nanosheets. ACS Applied Materials & Interfaces, 13(48), 57841–57850.

Nanostructured and advanced designs from biomass and mineral residues : multifunctional biopolymer hydrogels and hybrid films reinforced with exfoliated mica nanosheets

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Author: Niu, He1; Zhang, Kaitao1; Myllymäki, Sami2;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90570 Oulu, Finland
2Microelectronics Research Unit, Faculty of Information and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90570 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 8.5 MB)
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Language: English
Published: American Chemical Society, 2021
Publish Date: 2022-03-10


Transforming potential waste materials into high-value-added sustainable materials with advanced properties is one of the key targets of the emerging green circular economy. Natural mica (muscovite) is abundant in the mining industry, which is commonly regarded as a byproduct and gangue mineral flowing to waste rock and mine tailings. Similarly, chitin is the second-most abundant biomass resource on Earth after cellulose, extracted as a byproduct from the exoskeleton of crustaceans, fungal mycelia, and mushroom wastes. In this study, exfoliated mica nanosheets were individualized using a mechanochemical process and incorporated into regenerated chitin matrix through an alkali dissolution system (KOH/urea) to result in a multifunctional, hybrid hydrogel, and film design. The hydrogels displayed a hierarchical and open nanoporous structure comprising an enhanced, load-bearing double-cross-linked polymeric chitin network strengthened by mica nanosheets possessing high stiffness after high-temperature curing, while the hybrid films (HFs) exhibited favorable UV-shielding properties, optical transparency, and dielectric properties. These hybrid designs derived from industrial residues pave the way toward sustainable applications for many future purposes, such as wearable devices and tissue engineering/drug delivery.

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Series: ACS applied materials & interfaces
ISSN: 1944-8244
ISSN-E: 1944-8252
ISSN-L: 1944-8244
Volume: 13
Issue: 48
Pages: 57841 - 57850
DOI: 10.1021/acsami.1c18911
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
215 Chemical engineering
Funding: The authors acknowledge the support from the European Union’s Framework Program for Research and Innovation Horizon 2020 [Grant Agreement No. 812580 (“SULTAN”,].
EU Grant Number: (812580) SULTAN - European Training Network for the remediation and reprocessing of sulfidic mining waste sites
Copyright information: © 2021 The Authors. Published by American Chemical Society.