Abstract
Cellulose nanofiber (CNF) nanopapers from garlic skin prepared by vacuum filtration were soaked in various concentrations of polyimide (PI) solution (0–15% w/v). The samples were dried in a vacuum oven and pressed in a hot pressing machine at 120 °C for 1 h to obtain CNF/PI composite nanopapers. Even though the composites showed lower Young’s modulus and tensile strength, their toughness and elongation were much higher than those of the CNF nanopapers. Moreover, the impregnation of nanopapers in PI solution caused the formation of smaller pores and limited the pore size distribution but increased the BET-specific surface area of the samples, which led to a superior filtration capacity and a high quality factor (QF). The composites prepared by impregnation with 5% wt PI showed the most promising composite to be developed as air filters, as these composites had flexibility and showed superior filtration (99%) efficiency and higher QF than the commercial filters.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
The authors are grateful to the Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi (KMUTT) for providing some chemicals and access to the instruments, TGA and BET. One of the authors, Fariba Yeganeh, expresses her sincere thanks to KMUTT through its Petchra Pra Jom Klao Doctoral Scholarship. Our grateful thanks are also extended to KMUTT Research Center of Excellence Project for partial financial support in this project.
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This work was partially supported by the KMUTT Research Center of Excellence Project.
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Writing—Original draft preparation, Conceptualization, Methodology: FY; Writing—Review and Editing: NC; Supervision, Conceptualization, Writing—Review and Editing: WC.
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Yeganeh, F., Chiewchan, N. & Chonkaew, W. Cellulose nanofiber/polyimide composites for highly-efficient air filters. Cellulose 30, 4421–4436 (2023). https://doi.org/10.1007/s10570-023-05131-w
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DOI: https://doi.org/10.1007/s10570-023-05131-w