| Abstrakt: |
Researchers often grapple with the challenge of managing biological waste. This study represent this issue by exploring the potential utilization of this biological waste. Specifically, this research focused on investigating the dielectric properties of cellulose extracted from sugarcane. Additionally, this study delves into the development of a nanocomposite using sugarcane cellulose and magnetite nanoparticles. The magnetite nanoparticles are synthesized utilizing the coprecipitation method. The particle size and structure of the prepared magnetite nanoparticles were examined through transmission electron microscope and X-ray diffraction techniques. For preparation of the nanocomposite, a homogeneous mixture was achieved by dispersing magnetite and cellulose in distilled water using ultrasonication. Cellulose was loaded with 6 wt% magnetite, which represents the maximum concentration. The cellulose/magnetite nanocomposite exhibited significant differences in dielectric properties, influenced not only by the crystallization properties of cellulose, but also by the interfacial charges accumulated at the interfaces between cellulose and magnetite at different temperatures up to 120 °C and in the frequency, range extending from 100 Hz to 1 MHz. The universal Jonscher power law is a strong fit to the conductivity spectrum observed in both cellulose and cellulose/magnetite samples. In the case of the cellulose sample, the electrical conduction mechanism was identified as ionic conduction. For the cellulose/magnetite sample, the conduction mechanism appears depend on both the temperature and frequency range. At low temperatures, predictions indicate small polaron hopping in the low-frequency range and associated barrier hopping in the high-frequency regions. Conversely, at high temperatures, the expected conduction mechanism shifts toward ionic conduction (n > 0.5). Nyquist diagrams were constructed, and it was shown that the addition of magnetite affects the components of the equivalent circuit. Examination of the electrical modulus revealed a relaxation peak in the cellulose sample, which is attributed to the increase in the degree of crystallinity accompanying the increase in temperature and the release of water molecules from the cellulose structure. The Havriliak–Negami (HN) model was used on the real and imaginary parts of the electrical modulus of the samples, and there is good agreement between the theoretical and experimental results. [ABSTRACT FROM AUTHOR] |
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