| Autor: |
Pandhare AB; Department of Chemistry, Shivaji University, Kolhapur 416 004, MS, India.; Department of Chemistry, M.H. Shinde Mahavidyalaya, Tisangi, Gaganbavda, Kolhapur 416 206, MS, India., Mulik SV; Department of Chemistry, Shivaji University, Kolhapur 416 004, MS, India., Malavekar DB; Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, Gwangju 61186, South Korea., Kim JH; Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, Gwangju 61186, South Korea., Khot VM; Center for Interdisciplinary Research, D.Y. Patil Education Society Deemed University, Kolhapur 416 006, MS, India., Kumar P; Department of Physics, Mahatma Gandhi Central University, Motihari 845 401, BR, India., Sutar SS; Yashwantrao Chavan School of Rural Development, Shivaji University, Kolhapur 416 004, India., Dongale TD; Computational Electronics and Nanoscience Research Laboratory, School of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416 004, MS, India., Patil RP; Department of Chemistry, M.H. Shinde Mahavidyalaya, Tisangi, Gaganbavda, Kolhapur 416 206, MS, India., Delekar SD; Department of Chemistry, Shivaji University, Kolhapur 416 004, MS, India. |
| Abstrakt: |
In this study, various compositions of α-Fe 2 O 3 , Li 3 x Fe 2-x O 3 , where x = 0.1, 0.3, and 0.5, along with chitosan (CTS)-coated Li 1.5 Fe 1.5 O 3 nanomaterials (NMs), were synthesized using a sol-gel method. Rietveld refinement analysis indicated a predominance of the rhombohedral phase for lower Li-doped content ( x = 0.1) and a transition to cubic crystal structures at higher Li-doped content ( x = 0.3 and 0.5) within the host lattice. Field emission scanning electron microscopy (FE-SEM) images revealed irregular spherical morphologies, while transmission electron microscopy (TEM) images showed average particle sizes ranging from 19 to 40 nm across the various NMs. Superconducting quantum interference device (SQUID) analysis demonstrated a ferromagnetic nature with the highest saturation magnetization measured at 49.84 emu/g for Li 1.5 Fe 1.5 O 3 NMs. X-ray photoelectron spectra (XPS) exhibited Fe 2p 3/2 and Fe 2p 1/2 peaks at 712.60 and 726.13 eV, respectively, Li 1s at 57.58 eV, and O 1s at 533.44 eV for the representative samples; these characteristic XPS peaks shifted to a lower binding energy for CTS-coated Li 1.5 Fe 1.5 O 3 NMs. Hyperthermia studies demonstrated that the Li-doped samples reached a temperature range between 42 and 44 °C under an alternating current (AC) magnetic field applied at 167.6 to 335.2 Oe, with a constant frequency of 278 kHz. The specific absorption rate (SAR) was recorded as 265.11 W/g for Li 1.5 Fe 1.5 O 3 and 153.48 W/g for CTS-coated Li 1.5 Fe 1.5 O 3 NMs, both surpassing the SAR values of the other samples. Furthermore, various machine learning techniques were utilized to analyze how different synthesis conditions and material properties affected the heating efficiency and SAR values of the synthesized materials. The study also suggests an optimized set of guidelines and heuristics to enhance the heating performance and SAR values of these materials. Finally, magnetic CTS-coated Li 1.5 Fe 1.5 O 3 NMs exhibited a higher cell viability, as confirmed by MTT assays conducted on the NRK 52 E normal cell line. |
