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Anisotropic Alignment of Bacterial Nanocellulose Ionogels for Unconventionally High Combination of Stiffness and Damping

Authors
Choi, WonseokAbraham, AmithKo, JongkukSon, Jeong GonCho, JinhanSang, Byoung-InYeom, Bongjun
Issue Date
2022
Publisher
AMER CHEMICAL SOC
Keywords
bacterial nanocellulose; ionogel; alignment; dynamic mechanical property; ionic conductivity
Citation
ACS APPLIED MATERIALS & INTERFACES, v.14, no.26, pp.30056 - 30066
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
14
Number
26
Start Page
30056
End Page
30066
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/146067
DOI
10.1021/acsami.2c05500
ISSN
1944-8244
Abstract
Ionogels are emerging materials for advanced electrochemical devices; however, their mechanical instability to external stresses has raised concerns about their safety. This study reports aligned bacterial nanocellulose (BC) ionogel films swelled with the model ionic liquid (IL) of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF(4)) for an unprecedented combination of high stiffness and high energy dissipation without significant loss of ionic conductivity. The aligned BC ionogel films are prepared through wet-state stretching methods, followed by drying and swelling by ILs. The aligned ionogel films exhibit significantly improved dynamic mechanical properties, overcoming the mechanical conventional limit of traditional materials by 2.0 times at 25 degrees C and by a maximum of 4.0 times at 0 degrees C. Additionally, the same samples exhibit relatively high ionic conductivities of 0.16 mS cm(-1) at 20 degrees C and 0.45 mS cm(-1) at 60 degrees C with storage moduli over 10 GPa. The synergistic effect of the mechanical reinforcements by alignment of the BC nanofibers and the plasticizing effects by ILs could be attributed to the significant enhancement of dynamic mechanical properties and the retention of ionic conductivities. These results will lead to a deeper understanding of the material design for mechanically superior ionogel systems with increasing demands for advanced electronic and electrochemical devices.
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공과대학 (화공생명공학과)
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