Search

Your search keyword '"Shukrullah, Shazia"' showing total 304 results
Start Over Author "Shukrullah, Shazia"
304 results on '"Shukrullah, Shazia"'

44. Tailoring properties of Ni0.50Co0.50DyxFe2–xO4 ceramics using microwave non-thermal plasma for high-frequency devices.

Author

Munir, Muhammad Adnan, Naz, Muhammad Yasin, Shukrullah, Shazia, Naz, Ahmad, Irfan, Muhammad, Rahman, Saifur, and Mursal, Salim Nasar Faraj

Subjects
NON-thermal plasmas, PERMITTIVITY, MICROWAVE plasmas, DIELECTRIC properties, DIELECTRIC loss
Abstract

Dysprosium doped Ni0.50Co0.50DyxFe2−xO4 (x = 0.25, 0.50, 0.75) was synthesized via auto combustion of nitrate citrate gel. The prepared composites were given microwave plasma treatment to improve their dielectric properties for constructing high-frequency devices. X-ray diffraction analysis confirmed the production of Dy-doped cubic spinel NiCo ferrites. The average crystallite size for the untreated magnetic composite was 32.10 nm, while for plasma-treated samples was 25.17 nm. A growth in lattice parameters and decreased porosity was observed in plasma-treated composites. VSM findings revealed a decrease in saturation magnetization from 54.15 to 36.75 emu/g with an increase in Dy3+ from 0.25 to 0.50%. Saturation magnetization again raised with increasing Dy3+ content from 0.50 to 0.75%. The lower Dy3+ concentration resulted in low saturation magnetization, while the high Dy3+ concentration showed high saturation magnetization of the composite. Temperature and frequency-dependent dielectric characteristics revealed bulbous enrichment in the dielectric constant and significant Q factor for plasma-treated samples. The perceived deviation in dielectric loss with frequency change is credited to the conduction phenomenon, which agrees with Koop's phenomenological theory. High dielectric constant and low dielectric loss, even at higher temperatures, enable the synthesized ferrites to be strong candidates for high-frequency devices. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

45. Effect of Nonthermal Plasma on Cation Distribution and Photocatalytic Activity of MgFe2O4 Nanoparticles for Dye Degradation Application.

Author

Busharat, Muhammad Aqib, Shukrullah, Shazia, Ibrahim, Ahmed Ahmed, Naz, Muhammad Yasin, Iqbal, Mahwish, Khan, Yasin, Shoaib, Muhammad, and Déon, Sébastien

Subjects
*NON-thermal plasmas, *MICROWAVE plasmas, *BAND gaps, *GENTIAN violet, *PHOTOCATALYSTS, *IRRADIATION
Abstract

Nanophotocatalysts are becoming increasingly popular for removing heavy metals from wastewater, degrading organic pollutants, and producing hydrogen. In this work, MgFe2O4 nanoparticles were prepared by a sol‐gel process to study the photocatalytic degradation of crystal violet (CV), rhodamine blue (RhB), and methylene blue (MB) dyes under sunlight irradiation. The prepared MgFe2O4 nanoparticles were calcined at 500°C and then treated with nonthermal microwave plasma for 60 min. The X‐ray diffraction (XRD) analysis revealed that the crystallinity of plasma‐treated MgFe2O4 nanoparticles increased by showing a different cation distribution compared with plasma‐treated nanoparticles based on the intensity ratios of (220), (400), and (420) diffraction peaks. The intensity ratios of XRD peaks decreased, and the lattice parameter increased after plasma treatment. Crystallite size also increases after plasma treatment. The optical band gap energy of the treated ferrites decreased from 2.21 eV to 2.17, showing increased light absorption in the visible region compared with pristine ferrites. The saturation magnetization of magnetic photocatalysts increased from 40.9 emu/g to 62.16 emu/g after plasma modification. The photocatalytic activity for CV, RhB, and MB degradation increased from 60%, 65%, and 53% to 90%, 91%, and 87% after plasma modification. Plasma treatment enhances dye degradation by promoting the formation of reactive species that can effectively break down the dye molecules. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results