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Published on: June 17, 2014
Lipase induced highly hydrophobic nanofibrillated cellulose film for strain sensor application
Yingchao Wang1, Qiang Wang2, Shanshan Liu2
1State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, China.
Abstract:
An environmental-friendly lipase induced highly hydrophobic NFC film was fabricated through lipase induced dimethyl adipate (DA) esterification followed by silver nanowires (AgNWs) coating for strain sensor application. Due to the lipase activation, the substitution degree (DSNMR) of 0.18 was achieved, which was three times higher than that of the control sample (without lipase treatment of NFC-DA). As a result, the water contact angle (WCA) of lipase induced adipated-NFC film was reached to 105 ± 3° from 50 ± 2.3° of NFC-DA. In addition, the cellulose structure and performance were well maintained after lipase induced esterification, confirmed by AFM, SEM, TG/DTG, and XRD analysis. After AgNWs coating and annealing, the hydrophobic NFC film-based strain sensor exhibited excellent sensitivity towards human motion, such as finger/wrist movement in real-time, even under wet conditions. Overall, a highly hydrophobic NFC film-based strain sensor was fabricated, which has promising application in wearable devices for human motion monitoring.
