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Article

High-Speed Fabrication of Clear Transparent Cellulose Nanopaper by Applying Humidity-Controlled Multi-Stage Drying Method

The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Nanomaterials 2020, 10(11), 2194; https://doi.org/10.3390/nano10112194
Received: 27 August 2020 / Revised: 20 September 2020 / Accepted: 2 November 2020 / Published: 4 November 2020
(This article belongs to the Special Issue New Horizon in Cellulose Nanofiber and Its Materials)
As a renewable nanomaterial, transparent nanopaper is one of the promising materials for electronic devices. Although conventional evaporation drying method endows nanopaper with superior optical properties, the long fabrication time limits its widely use. In this work, we propose a multi-stage drying method to achieve high-speed fabrication of clear transparent nanopaper. Drying experiments reveal that nanopaper’s drying process can be separated into two periods. For the conventional single-stage evaporation drying, the drying condition is kept the same. In our newly proposed multi-stage drying, the relative humidity (RH), which is the key parameter for both drying time and haze, is set differently during these two periods. Applying this method in a humidity-controllable environmental chamber, the drying time can be shortened by 35% (from 11.7 h to 7.6 h) while maintaining the same haze level as that from single-stage drying. For a conventional humidity-uncontrollable oven, a special air flow system is added. The air flow system enables decrease of RH by removing water vapor at the water/air interface during the earlier period, thus fabricating clear transparent nanopaper in a relatively short time. Therefore, this humidity-controlled multi-stage drying method will help reduce the manufacturing time and encourage the widespread use of future nanopaper-based flexible electronics. View Full-Text
Keywords: cellulose nanofibers; transparent nanopaper; fast-drying fabrication; relative humidity control; multi-stage drying cellulose nanofibers; transparent nanopaper; fast-drying fabrication; relative humidity control; multi-stage drying
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MDPI and ACS Style

Li, C.; Kasuga, T.; Uetani, K.; Koga, H.; Nogi, M. High-Speed Fabrication of Clear Transparent Cellulose Nanopaper by Applying Humidity-Controlled Multi-Stage Drying Method. Nanomaterials 2020, 10, 2194. https://doi.org/10.3390/nano10112194

AMA Style

Li C, Kasuga T, Uetani K, Koga H, Nogi M. High-Speed Fabrication of Clear Transparent Cellulose Nanopaper by Applying Humidity-Controlled Multi-Stage Drying Method. Nanomaterials. 2020; 10(11):2194. https://doi.org/10.3390/nano10112194

Chicago/Turabian Style

Li, Chenyang, Takaaki Kasuga, Kojiro Uetani, Hirotaka Koga, and Masaya Nogi. 2020. "High-Speed Fabrication of Clear Transparent Cellulose Nanopaper by Applying Humidity-Controlled Multi-Stage Drying Method" Nanomaterials 10, no. 11: 2194. https://doi.org/10.3390/nano10112194

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