Department of Physics

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Author: search.filters.author.Dr. Mukhtar AhmadSubject: search.filters.subject.FA21

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    Sol-gel Synthesis of Mn-substituted Cupper Ferrite (MnxCu1-x Fe2O4, x=0, 0.33, 0.67, 1.00) Nano Particles as Anode for Lithium Ion Batteries.
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2023) Hamid Yaseen; CIIT/FA21-RPH-026/LHR; Dr. Mukhtar Ahmad; LHR TP 8584
    Mn substituted Cupper ferrites (MnxCu1-x Fe2O4, x=0, 0.33, 0.67, 1.00) have been synthesized from metal nitrates and citric acid by sol-gel method (chemical process). This study aims to know the effects of Mn substitution on structural, magnetic and electrochemical properties of Cupper ferrites. For characterizing the prepared ferrites, different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy were used. In addition, vibrating sample magnetometer (VSM) is used for investigation of magnetic properties such as saturation magnetization (Ms), residual magnetism (Mr) and coercive force (Hc). A single phase spinal structure was confirmed by XRD and lattice parameter was increased from 8.36 Å to 8.52 Å with increasing Mn contents. Micro-graphs of SEM show that nanoparticles are agglomerated and non-uniform in size. The FTIR spectrum shows that the absorption band of the octahedral B-site is at about 1422 cm-1 to 1434 cm-1. For pure cupper ferrite, band is shifted towards higher frequency by manganese content. CV results show that with increase in scan rate, specific capacitance decreases so the area of loop increases which clearly means that the investigated material is best for storage devices such as lithium ion batteries (LIBs).
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    Investigation of NiO/Potato Peels Nanocomposite Prepared through Hydrothermal Method
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2023) AYESHA ANJUM; CIIT/FA21-RPH-025/LHR; Dr. Mukhtar Ahmad; LHR TP 8592
    One of the most important problems in the world today is the fluoride pollution of the surrounding waters due to activities and anthropogenic activities. Due to their high catalytic activity and large surface area, ferrite nanoparticles have gained interest in wastewater treatment. Synthesis of NiO/Potato Peels Nanocomposites using a hydrothermal process to remove fluoride from drinking water is exported in the present study. Various tests such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transmission infrared spectroscopy (FTIR) are used to identify the structure and morphology of the composite. The XRD results identified a single-phase structure with lattice parameters ranging from 8.38Å to 8.33Å. Agglomerated and heterogeneous-sized nanoparticles are seen in SEM micrographs. FTIR depicts the ranges of NiO within the repetitiveness range of 400–4000 cm-1. These incorporation bands, situated at 665 cm-1 and 543 cm-1, pertain to the extended shaking modes of the tetrahedral ore-oxygen bond and the octahedral ore- oxygen bond, individually.
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    Study of Structure, Morphology, and Adsorption Properties of Ni0.2Zn0.8Fe2O4/GO Composite Prepared by Hydrothermal Method.
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2023) AFAQ ARSHAD; CUI/FA21-RPH-029/LHR; Dr. Mukhtar Ahmad; LHR TP 8585
    Environmental degradation, particularly water contamination, is causing more and more serious issues with human health today. Fluoride ions and heavy metals are the main sources of water pollution. In the current study, an in-situ approach was used to generate a Ni0.2Zn0.8Fe2O4/GO nanocomposite that was examined for its ability to remove fluoride ions from water. Different techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM), are used to characterize the produced nanocomposite. The produced ferrite reveals a face-centered cubic (FCC) structure in a single-phase spinal structure with no impurities in the sample, according to XRD data. The agglomerated and variably sized nanoparticles were observed in SEM micrographs. For Nickel zinc ferrite, the FTIR spectra indicate the absorption band of the octahedral and tetrahedral sites. A fluoride sensor was used in the nano synthesis lab to measure the amount of fluoride in the drinking water. The elimination of fluoride was conducted at various time intervals and in the pH range from 3 to 11. Finally, these ferrites have been employed to remove fluoride ions from several drinking water sources in Lahore, and the results have been excellent.