Nanotechnology and Catalysis Research Center (NANOCAT), Institute for Advanced Studies, Universiti Malaya, 50603 Kuala Lumpur, Malaysia; Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
Int J Biol Macromol. 2021 Jun 1;180:392-402. doi: 10.1016/j.ijbiomac.2021.03.066. Epub 2021 Mar 15.
The present work focuses on the development of cellulose nanofibrils (CNF) film that derived from sustainable biomass resources, which potentially to work as bio-based conductive membranes that assembled into supercapacitors. The chemically purified cellulose was isolated from different parts of coconut (coconut shell and its husk) and further subjected to 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation for CNF preparation. Physicochemical properties of prepared CNFs were studied in terms of chemical characteristics & crystallinity, surface functionalities, surface morphology, and thermal properties. Both coconut shell-derived CNF and coconut husk-derived CNF fulfilled with nanocellulose's characteristics with fibres width ranged of 70-120 nm and 150-330 nm, respectively. CNF films were further prepared by solvent casting method to measure the modulus elasticity, piezoelectric and dielectric properties of the films. Mechanical study indicated that coconut shell-derived CNF film showed a higher value of elastic modulus than the coconut husk-derived CNF film, which was 8.39 GPa and 5.36 GPa, respectively. The effectiveness of electrical aspects for CNF films are well correlated with the crystallinity and thermal properties, associated with it's composition of different coconut's part.
本工作专注于纤维素纳米纤维（CNF）薄膜的开发，该薄膜源自可持续的生物质资源，有望用作组装成超级电容器的生物基导电膜。从椰子的不同部位（椰子壳及其外壳）分离出化学纯化的纤维素，并进一步进行 2,2,6,6-四甲基哌啶-1-氧自由基（TEMPO）介导的氧化，以制备 CNF。从化学特性和结晶度、表面官能团、表面形态和热性能方面研究了制备的 CNF 的物理化学性质。椰子壳衍生的 CNF 和椰子壳衍生的 CNF 都具有纳米纤维素的特性，纤维宽度分别为 70-120nm 和 150-330nm。通过溶剂浇铸法进一步制备 CNF 薄膜，以测量薄膜的弹性模量、压电和介电性能。机械研究表明，与椰子壳衍生的 CNF 薄膜相比，椰子壳衍生的 CNF 薄膜具有更高的弹性模量值，分别为 8.39GPa 和 5.36GPa。CNF 薄膜的电学性能与结晶度和热性能密切相关，这与其来自椰子不同部位的组成有关。
