Princess Nora bint Abdul Rahman University

The increasing interest in spinel ferrites due to their notable characteristics including elevated electrochemical stability, redox states and pseudocapacitive activity which make them suitable for application in supercapacitors. The present research involves synthesis of NiFe2O4@g-CN electrode material using hydrothermal route. The various characterization techniques including, electrochemical and physical were used for NiFe2O4 and NiFe2O4@g-CN nanocomposite. The fabricated NiFe2O4@g-CN nanosheet showed exceptional specific capacitance of 740 F/g energy and power density were 38 Wh/Kg and 305 W/Kg respectively at 1 A/g determined from galvanostatic charge discharge plot. The charge transfer resistance (Rct) value of NFO@g-CN (0.23 Ω) exhibited lower value than NFO (0.35 Ω) and g-CN (0.27 Ω). The electrochemical stability test revealed that after 5000th cycle NiFe2O4@g-CN material maintains a very stable structure. Therefore, improvements in electrochemical efficiency of NiFe2O4 because of inclusion of graphitic carbon nitride which provided larger surface area, synergistic interaction and large number of active sites. These finding indicates that electrodes materials have potential material for energy storage device and it can further used in toward water splitting and various energy storage equipment’s.

Co-precipitation method was used as a quick and effective way to elaborate the Mg and Cu co-doped TiO2 (MgCu/T) nanoparticles. The formation of a single phase (anatase) with a tetragonal structure of nano-crystallized MgCu/T was confirmed by X-ray diffraction (Card No. 89–4203). Experimental results indicate that the synthesized MgCu/T nanoparticles are nanometric, ranging from 12 to 25 nm, consistent with the findings from SEM images. Additionally, the UV–Vis reflectance spectra showed that MgCu/T nanoparticles possess strong absorption properties in the UV–visible region. Hence, the photocatalytic activities showed that the 4 mol

This study presents a comprehensive first-principles investigation of the structural, mechanical, electronic, optical, thermoelectric, and thermodynamic properties of half-Heusler PtTiZ (Z = Ge, Pb) compounds using the full-potential linearized augmented plane-wave (FP-LAPW) method combined with semiclassical Boltzmann transport theory. Exchange–correlation effects were treated within the LDA, PBE-GGA, and Tran–Blaha modified Becke–Johnson (TB-mBJ) schemes to achieve accurate electronic descriptions. Both alloys crystallize in a stable cubic F-43 m structure and exhibit indirect semiconducting behavior with band gaps of 0.66 eV (PtTiGe) and 0.387 eV (PtTiPb). The density-of-states analysis indicates that the valence region is dominated by Ti-3d and Z-p hybridized states, confirming strong p–d interactions. Mechanical stability criteria and positive elastic constants verify that both compounds are mechanically robust, with PtTiGe being stiffer and harder than PtTiPb. Optical results reveal pronounced absorption and high optical conductivity in the ultraviolet region, suggesting potential for optoelectronic applications. Thermoelectric analysis demonstrates p-type character with Seebeck coefficients of 229.21 µV K⁻¹ (PtTiGe) and 236.21 µV K⁻¹ (PtTiPb) at 300 K, and 235.05 µV K⁻¹ and 237.31 µV K⁻¹ at 1200 K, respectively. The corresponding lattice thermal conductivities decrease to 0.45 W m⁻¹ K⁻¹ and 0.32 W m⁻¹ K⁻¹, yielding maximum dimensionless figures of merit (ZT) of 0.68 and 0.70 at 1200 K. Thermodynamic results confirm that the Debye temperature increases with pressure while heat capacity decreases, ensuring stability at elevated conditions. Overall, the synergistic combination of electronic tunability, optical responsiveness, and favorable thermoelectric performance highlights PtTiZ (Z = Ge, Pb) as promising candidates for high-temperature thermoelectric and ultraviolet-optoelectronic applications.

Synthetic dyes, such as methylene blue (MB), are increasingly becoming sources of water pollution and require better treatment strategies. This study describes an eco-friendly method for methylene blue degradation using green synthesized iron oxide nanoparticles form Ureibacillus chungkukjangi. This bacterium was isolated from clinical samples and identified using 16S rRNA gene amplification and sequenced using Sanger sequencing technology. The identified Ureibacillus chungkukjangi was submitted to NCBI with NCBI accession no. PQ568249.1. The secondary metabolites of the bacteria acted as capping agents to both reduce and stabilize the nanoparticle synthesis. The nanoparticle synthesis was achieved by the addition of iron chloride solution as a precursor to bacterial metabolites, forming the orange-brown solution to dark brown that showed initial signs of nanoparticle synthesis that were verified with UV–Vis Absorption spectra giving peaks at 380 nm. In FTIR spectra of the range examined (570–630 cm⁻1), Fe–O bonds were observed, which confirms that biofunctionalization of the surface had been done. Also observed were O–H, C–H, C=O, and C–O functional groups of surfaces biofunctionalization. Furthermore, SEM analysis showed the particle size ranging from 50 to 400 nm while massively polygonal, where EDX analysis further confirmed the presence of iron in the sample. The degradation studies conducted over 15 days showed that there was a total of 89

Vibrio fluvialis is an emerging foodborne pathogen causing gastroenteritis and extraintestinal infections, representing a significant public health concern due to rising antimicrobial resistance and the absence of an approved vaccine. This study aimed to design a multi-epitope subunit vaccine against V. fluvialis using immunoinformatics and a standard multi-epitope vaccine design pipeline. Two surface-exposed immunogenic membrane proteins, ATP-dependent zinc metalloprotease FtsH and lytic murein transglycosylase F, were selected as antigenic targets. Ten epitopes, including four MHC class I, four MHC class II, and two B-cell epitopes, were predicted and assembled into a 246 amino acid vaccine construct. The construct showed an antigenicity score of 0.8610. Population coverage analysis indicated that these epitopes could potentially cover 99.97