Browsing by Author "Tanisa, N.Y."

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Synthesis, evaluation, and monitoring of red amaranth extract for power production
(Institute of Physics, 2024-11-18) Tanisa, N.Y.; Khan, K.A.; Salahuddin, M.
The scientific paper describes the synthesis of silver nanoparticles (Ag NPs) using a fresh red amaranth preparation and explores their potential to enhance the output current of a red amaranth bio-electrolytic cell. The study employed various analytical techniques such as x-ray diffraction (XRD), Fourier transform infrared (FTIR), ultraviolet-visible spectroscopy (UV-vis), dynamic light scattering (DLS), and Raman spectroscopy to characterise and detect the nanoparticles. The UV-vis analysis of the dripping media containing silver nanoparticles exhibited an absorption peak, indicating the presence of the nanoparticles. FTIR was utilised to examine the interaction between the biomaterial components and the oxidation and wrapping of silver nanoparticles. XRD analysis revealed that the synthesised nanoparticles possessed a naturally columnar shape and a face-centered cubic (FCC) structure. The average size and morphology of the nanoparticles were characterised by dynamic light scattering (DLS). Raman spectra revealed the unique surface-enhancing properties of synthesised Ag NPs. The research presented in the paper highlights the remarkable performance of silver nanoparticles in bio-electrolyte power generation systems. It emphasises a straightforward, cost-effective, and environmentally friendly method for producing Ag NPs using red amaranth extract. These findings contribute to the development of a novel framework for bio-electrochemical cells and emphasise the importance of further research on the effects of Ag NPs on these cells. It is found that the open circuit voltage is 3.254 V, short circuit current is 2.256 mA, and load current is 1.987 mA before using the Ag NPs and open circuit voltage is 5.678 volts, short circuit current is 4.212 mA, and load current is 2.887 mA after using the Ag NPs. It is seen that the values of the three parameters have been increased after using the Ag NPs, which ensured the significance of the use of Ag NPs
Upcycling prawn shells: Chitosan–carbon nanotube nanocomposites with boosted magnetic and electrical properties
(John Wiley and Sons Inc, 2024-03-22) Awal, R.; Al-Mamun, M; Jewena, N.; Khandaker, J.I.; Tanisa, N.Y.; Ahmed, S.; Shahriar, F.; Haque, M.M.
Multi-walled carbon nanotubes (MWCNTs) were successfully synthesized and functionalized by chemical vapour deposition and acid reflux methods, respectively. Chitosan (CTS) was prepared by a chemical extraction method from waste prawn shells. Various weight fractions of functionalized multi-walled carbon nanotubes (f-MWCNTs) have been used as reinforcing agent in CTS biopolymer matrix. Fourier transform infrared spectroscopy analysis was done, which confirms the presence of absorption bands of the various functional groups of chitin, CTS, and MWCNTs. Raman spectra revealed the quality of MWCNTs, the extent of their functionalization, and the quality of nanocomposites. The X-ray diffraction analysis showed the distinctive peaks for f-MWCNTs’ and also revealed the formation of CTS/f-MWCNTs nanocomposites. Transmission Electron Microscopy (TEM) analysis also exhibited that the CTS/f-MWCNTs nanoparticles have a well-defined crystalline structure. The highest coercivity and magnetization (Ms) of the CTS/5%f-MWCNTs nanocomposite are 602 Oe and 0.1202 emu/g, respectively that have been enhanced by 3.83 and 5.27 times compared to the pure CTS respectively. It showed that the conductivity is getting higher with the addition of f-MWCNTs in the CTS matrix. CTS/5% f-MWCNTs composites exhibit the highest conductivity than other composites and the conductivity of CTS/5% f-MWCNTs composite is 4.0×10−4 S/m.