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- Title
Production of lignocellulose nanofibrils by conventional and microwave-assisted deep-eutectic-solvent pretreatments: mechanical, antioxidant, and UV-blocking properties.
- Authors
Kwon, Gu-Joong; Cho, Seung-Woo; Bandi, Rajkumar; Yang, Bong-Suk; Dadigala, Ramakrishna; Han, Song-Yi; Ma, Seo-Young; Kim, Jeong-Ki; Kim, Nam-Hun; Lee, Seung-Hwan
- Abstract
Herein for the first time, lignocellulose nanofibrils (LCNF) were prepared from pine-wood powder using microwave (MW)-assisted deep eutectic solvent (DES) pretreatment coupled with high-pressure homogenization. A DES based on choline chloride and lactic acid was employed, and LCNFs prepared by conventional DES pretreatment at 110 °C (LCNF-110) and 130 °C (LCNF-130) were used for comparison. Although MW treatment offered a high removal of lignin (70%) and hemicellulose (90%) within a short time (110 s), the morphological observations by scanning and transmission electron microscopies revealed excellent nanofibrillation of the conventionally heat-treated samples. Likewise, LCNF-110 and LCNF-130 exhibited high tensile strengths of 154.6 ± 5.0 and 136.8 ± 1.2 MPa, respectively, whereas that of LCNF-MW was only 75.6 ± 1.4 MPa. Interestingly, LCNF-MW with a lignin content between that of LCNF-110 and LCNF-130 exhibited high thermal stability (Tmax 309.6 °C) and potent antioxidant properties. However, the lignin contents of the LCNFs determined their UV-radiation blocking efficiency, where LCNF-110 > LCNF-MW > LCNF-130. Furthermore, all LCNF films exhibited good visible-light transparency, flexibility, and water contact angles (> 87°), indicating their promising potential for packaging applications.
- Subjects
EUTECTICS; LIGNOCELLULOSE; SCANNING transmission electron microscopy; CHOLINE chloride
- Publication
Cellulose, 2023, Vol 30, Issue 7, p4277
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-023-05164-1