Browsing by Author "Dr. M. Hammad Aziz"

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    Antibacterial Effect of Gold doped ZrO2 Nanoparticles for Wound Healing Application
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) Ifrah Mateen; SP20-RPH-006; Dr. M. Hammad Aziz; LHR TP 7707
    Metallic Np`s are well known for biological applications as well as antimicrobial activity and wound dressing materials. As an alternative to antibiotics, nanoparticles (NPs) are increasingly being employed to target bacteria. Antibacterial coatings for implantable devices and promote wound healing and medicinal materials to prevent infection, bacterial detection systems to generate microbial diagnostics, antibiotic delivery systems to treat disease, and antibacterial vaccines to control bacterial infections are all examples of NP applications. Gold doped zirconium oxide (Au-ZrO2) was used in this study. For antibacterial properties, gold doped ZrO2 NPs were produced using a co-precipitation technique. The antibacterial test was carried out using the well diffusion method. The zone of inhibition against E. coli and S.aureus was measured. Higher gold doping concentrations result in a broader inhibition zone against gram positive and gram-negative microorganisms. Fourier Infrared Transform Spectroscopy (FTIR), X-Ray diffraction (XRD), Raman spectroscopy, and Scanning Electron Microscopy were used to analysis the produced nanoparticles (SEM). The existence of the ZrO2 functional group is explained by FTIR analysis and crystalline structure is determined by XRD. Raman spectra also confirm the optical and vibrational phonons and magnons present in ZrO2. SEM corroborated the morphology of nanoparticles.
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    Synthesis and Characterization of Silver Manganese Tungsten Oxide (AgMnWO3) Electrode Material on Graphene Substrate for High Performance of Energy Storage Devices
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Asma Zulfiqar; CIIT/FA23-RPH-012/LHR; Dr. M. Hammad Aziz; LHR TP 9844
    This work is centered on the synthesis and physical properties of AgMnWO₃ as superior energy storage electrodes on graphene scaffolds. As the search for higher efficiency of the energy storage systems advancing most of the conventional systems are challenged by a plethora of time-optimal parameters including stability, rate capability and energy density. AgMnWO₃ has also been identified to have preferable electrochemical performance; hence, would boost the supercapacitors’ performance only if incorporated with graphite. The AgMnWO₃/rGO nanocomposites will be synthesized by hydrothermal process. The surface characteristics and structural compositions of the composites will be examined by techniques such as Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). Electrochemical characterization using EIS, GCD and CV would be used to ascertain the main functional attribute like the specific capacitance, energy density, the charge transport capability. This preparation techno will be better equipped with graphene in AgMnWO3 and thereby provide the study with more comprehensive analysis of energy storage. Supercapacitors are advanced through the studies on super substrate graphene as well as AgMnWO3, getting relatively higher energy density than that of batteries. This material comes in handy in scenarios like energy storage in renewable power or efficiently integrating graphene composites within a manufacturing process across electric vehicles enhanced strength not to mention the conductivity in energy storage. The summary of investigations of AgMnWO3/rGO composites will shed light on the necessity of classical materials. Any such information that is considered useful to progress with future, sustainable technologies for high-energy storage.