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Bio-based thin films of cellulose nanofibrils and magnetite for potential application in green electronics

Arantes, Ana Carolina Cunha, Silva, Luiz Eduardo, Wood, Delilah F., Almeida, Crislaine das Graças, Tonoli, Gustavo Henrique Denzin, Oliveira, Juliano Elvis de, Silva, Joaquim Paulo da, Williams, Tina G., Orts, William J., Bianchi, Maria Lucia
Carbohydrate polymers 2019 v.207 pp. 100-107
Fourier transform infrared spectroscopy, capacitance, cellulose nanofibers, composite films, composite materials, dielectric properties, electrical equipment, electronic wastes, electronics, glycerol, magnetite, scanning electron microscopy, thermal stability, toxicity, wettability
The objective of this work was to prepare bio-based thin films and evaluate the additions of magnetite and glycerol on the physico-chemical (flexibility, wettability and barrier properties) and dielectric properties of cellulose/chitosan-based films. The films were prepared by solution casting and presented a suitable dispersion of the constituents observed by SEM and FTIR. The films were thermally stable up to 150 °C and had a higher flexibility, wettability and lower barrier properties upon addition of glycerol. The calculated dielectric constant (εr) for the composite films was based on measurements of capacitance, at 100 and 1000 Hz, with the additions of magnetite and glycerol more than doubling the εr increasing the charge storage capacity. The bio-based thin films have potential to be used as insulators in capacitors on the production of green electronics thus, reducing toxic and nonrenewable e-waste generation.