University of QomAdvances in Energy and Materials Research3041-88362620250601Hydrothermal Synthesis of Ce-Doped CdS Nanomaterials for Visible-Light Photocatalytic Applications in Energy and Environmental Systems411457410.22091/jaem.2026.15160.1038ENYounesHanifehpourDepartment of Chemistry, Sayyed Jamaleddin Asadabadi University, Asadabad, Iran0000-0002-1969-3308MohammadrezaRezaeiDepartment of Chemistry, Sayyed Jamaleddin Asadabadi University, Asadabad, IranJournal Article20250118CexCd1–xS (0 ≤ x ≤ 0.08) nanoparticles with varying cerium doping levels were successfully synthesized via a hydrothermal method. The structural, morphological, compositional, and optical properties of the prepared samples were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and UV–Vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of pure and Ce-doped CdS nanoparticles was evaluated through the visible-light-driven decolorization of Reactive Blue 19 in aqueous solution. Among the investigated compositions, the sample containing 6% Ce exhibited the highest photocatalytic efficiency compared to other dopant concentrations. The effects of key operational parameters—including cerium content, catalyst dosage, initial dye concentration, and the presence of radical scavengers—were systematically examined. The addition of radical scavengers such as iodide, carbonate, sulfite, and 1,4-benzoquinone significantly suppressed the decolorization efficiency, indicating the crucial role of reactive species in the degradation process. Overall, the results demonstrate that Ce-doped CdS nanoparticles, particularly at an optimal doping level of 6%, exhibit enhanced visible-light photocatalytic performance and promising reusability, highlighting their potential application in the removal of organic pollutants from wastewater.https://jaem.qom.ac.ir/article_4574_ff5a3c128656f6fb53639da0e9f024f8.pdfUniversity of QomAdvances in Energy and Materials Research3041-88362620250601Halide-Modulated Cu–Hg Heterodinuclear Complexes as Potential Precursors for Functional Energy and Environmental Materials1218436510.22091/jaem.2025.14486.1034ENAkbarGaemiDepartment of Chemistry, Faculty of Technical&Engineering, Saveh campus of Islamic Azad University, Saveh, Iran0000-0002-6172-2416MohsenMousaviDepartment of Chemistry, Faculty of Technical&Engineering, Saveh campus of Islamic Azad University, Saveh, Iran0000-0002-9737-4994Journal Article20250120This study reports the synthesis and comprehensive structural characterization of three novel heterodinuclear complexes, [CuL{HgCl2(CH3OH)}] (1), [CuL{HgBr2}] (2) and [CuL{HgI2}] (3). These complexes were generated through the reaction of HgX2 salts (X- = Cl-, Br- and I-) with a copper(II) Schiff base complex, (where H2L = N,N′-bis(2-hydroxyphenylidene)-2,2′-dimethyl-1,3-propanediamine).<br />The resulting compounds were characterized using elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. The structural analyses consistently revealed the formation of a heterodinuclear [CuIIHgII] core in all three species, with the central Cu(II) and Hg(II) ions bridged by the two phenolate oxygen atoms of the L ligand. <br />The coordination geometry around the Cu(II) center in all complexes is a distorted square planar (CuN2O2). In contrast, the coordination geometry of the Hg(II) ion is dependent on the coordinated halide: it adopts a distorted square pyramidal (HgO3Cl2) geometry in complex 1 (including a coordinated methanol molecule), but a tetrahedral (HgO2Br2 or HgO2I2) geometry in complexes 2 and 3, respectively. Supplementary crystallographic data for the three structures are registered with the CCDC as 1432472, 1432473, and 1432474.<br />The halide-dependent structural variation in the Hg(II) environment provides valuable insight for designing functional coordination materials. The robust Cu–Hg core and tunable electronic features highlight these complexes as potential precursors for optical, sensing, and environmental remediation materials within the broader field of energy and materials research.University of QomAdvances in Energy and Materials Research3041-88362620250601Fluorenone as a Promising Candidate for Nanoelectronics: Electric Field Effects Explored: computational approach1927436610.22091/jaem.2025.14884.1035ENRezaSafariDepartment of Chemistry, Faculty of Sciences, University of Qom, Qom, Islamic Republic of Iran0000-0001-6623-2080HamidHadiDepartment of Chemistry, Physical Chemistry group, Lorestan University, Khorramabad, IranJournal Article20250104Abstract: Fluorenone has garnered significant attention in nanoelectronics due to its promising electronic properties. This study investigates the effect of an electric field on fluorenone to assess its suitability for nanoelectronic applications using density functional theory (DFT) and Landauer theory (LT). The electronic properties of fluorenone were systematically analyzed under varying electric field strengths, focusing on the energy gap, dipole moment, electron spatial extent (ESE), cohesive energy, and current-voltage characteristics. Results reveal that while cohesive energy and bond length remain largely unaffected, the energy gap decreases notably under an applied electric field. Additionally, both the dipole moment and ESE distribution exhibit significant increases. The current-voltage profile demonstrates a sharp rise in current with increasing field intensity, emphasizing fluorenone’s potential as a strong candidate for field-effect molecular devices, such as molecular wires. These findings highlight fluorenone’s sensitivity to external electric fields, supporting its viability for advancing nanoelectronic technologies. The study provides critical insights into the tunability of fluorenone’s electronic properties, paving the way for its integration into next-generation nanoscale electronic systems.https://jaem.qom.ac.ir/article_4366_f630a35f298ea3314d49fe419a1d2ca8.pdfUniversity of QomAdvances in Energy and Materials Research3041-88362620250625Numerical Analysis of Coil Conductivity Effects on Energy Efficiency and Thermal Performance in Induction-Based Crystal Growth Systems2835437010.22091/jaem.2026.15272.1040ENHosseinKarbaschiKilometer one of Mahallat-Khomein road0000-0003-0980-4745Mohammad HosseinTavakoliPhysics Department, Bu-Ali Sina University, Hamedan 65174, Iran0000-0002-4829-8913Journal Article20250125Induction heating is a key technology in Czochralski crystal growth systems, where precise control of the thermal field inside the crucible is essential for achieving high crystal quality. While the influence of parameters such as excitation frequency, coil geometry, and input power has been widely investigated, the effect of the electrical conductivity of the induction coil has received comparatively little attention. In this study, the impact of induction coil electrical conductivity on heat generation, spatial heat distribution, and heating efficiency in an induction-heated Czochralski system is systematically investigated using a coupled electromagnetic numerical model. The governing Maxwell equations are formulated under axisymmetric and harmonic steady-state assumptions and solved using the finite element method. The electrical conductivity of the induction coil is varied over several orders of magnitude, while the crucible material properties are kept constant. The results demonstrate that increasing the coil conductivity significantly enhances the total heat generated within the crucible, improves the uniformity of heat distribution, and substantially reduces ohmic losses within the coil. A saturation-like behavior is observed at high conductivity values, indicating diminishing returns beyond a certain threshold. The heating efficiency of the system increases dramatically from only a few percent at low conductivities to values exceeding 90% at high conductivities. These findings highlight the critical role of induction coil electrical conductivity in optimizing energy efficiency and thermal stability in Czochralski crystal growth systems and provide practical guidelines for the design of high-performance induction heating configurations.https://jaem.qom.ac.ir/article_4370_27720f8153096e8dadbd8617789d5e03.pdfUniversity of QomAdvances in Energy and Materials Research3041-88362620250601Facile Synthesis of Fe₃O₄@Cu@Cu₂O Core–Shell Nanoparticles: A Preliminary Study on Magnetic and Structural Properties for Potential Catalytic Applications3643437110.22091/jaem.2026.15295.1041ENBagherMohammadiDepartment of Chemistry, Payame Noor University, P.O. Box 19395-3697 Tehran, IranElnazNasaghiDepartment of Chemistry, Payame Noor University, P.O. Box 19395-3697 Tehran, IranMohammad RezaPoor HeraviDepartment of Chemistry, Payame Noor University, P.O. Box 19395-3697 Tehran, Iran0000-0001-5999-5813• EzzatollahNajafiDepartment of Chemistry, Payame Noor University, P.O. Box 19395-3697 Tehran, Iran0000-0003-0785-073XJournal Article20241225This work describes a preliminary materials study on the synthesis of magnetic core-shellsynthesis of magnetic core-shell Fe₃O₄@Cu@Cu₂O nanoparticles through a facile two-step approach as a first step toward potential catalytic applications. The Fe₃O₄ core was initially prepared via co-precipitation method, followed by a solvothermal deposition of sequential Cu and Cu₂O layers using Glycerol as both solvent and reducing agent. The structural and morphological characteristics of the synthesized nanoparticles were comprehensively investigated using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). XRD analysis confirmed the crystalline phases of Fe₃O₄, metallic Cu, and Cu₂O, demonstrating successful formation of the core-shell structure. SEM images reveal nearly spherical nanoparticles with uniform size distribution ranging between 55-88 nm. Vibrating sample magnetometry (VSM) measurements exhibited superparamagnetic behavior with saturation magnetization of 60 emu/g, sufficient for efficient magnetic separation using an external magnet while maintaining catalytic accessibility. The unique architecture of these nanoparticles, combining magnetic responsiveness with catalytic active sites, suggests their potential as candidates for magnetically recoverable catalysts, though catalytic performance evaluation is beyond the scope of this preliminary study. The unique architecture suggests potential for magnetically recoverable catalysts in various organic transformations, offering significant advantages in terms of reusability and sustainability in terms of reusability and sustainability. The synthesized Fe₃O₄@Cu@Cu₂O nanocomposites demonstrate material properties suitable for further investigation in green chemistry protocols where efficient catalyst recovery and recyclability are crucial requirements. This study is limited to materials characterization and does not include catalytic reaction data.https://jaem.qom.ac.ir/article_4371_e74aeba5a37ac50cd7a8e0ac90a621a9.pdfUniversity of QomAdvances in Energy and Materials Research3041-88362620250625Integrated Stress-Induced Lipid Enhancement and Supercritical CO₂ Extraction for Efficient Biodiesel Production from Chlorella vulgaris4453457510.22091/jaem.2026.14935.1036ENMohsenDehnamakiDepartment of Biochemistry, College of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran0009-0001-3764-0816AbolghasemEsmaeili FereidouniDepartment of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resource University, Sari, Iran0000-0002-4307-9420Ramezan AliKhavarinejadDepartment of Biochemistry, College of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran0000-0001-8884-9049Seyed MasoudeKazemi Tabaei ZavarehDepartment of Chemistry, Faculty of Science, Islamic Azad University, Qom Branch, Qom, Iran0000-0003-4776-9784Journal Article20250125This study evaluates the efficiency of supercritical carbon dioxide (SC-CO₂) combined with n-hexane and ethanol as co-solvents for lipid extraction from Chlorella vulgaris cultivated under stress conditions for biodiesel production. The microalgae were grown using a two-stage cultivation strategy and divided into three groups: control (pre-stress), Treatment 1 (nutrient deprivation, pH 11, and 2 M NaCl for 24 h), and Treatment 2 (nutrient deprivation and 2 M NaCl for 72 h). Extraction was performed at pressures of 250, 300, and 350 bar and temperatures of 50 and 70 °C.<br />The total lipid contents for the control, Treatment 1, and Treatment 2 were 8.78 ± 0.45%, 57.4 ± 0.75%, and 55.3 ± 1.03%, respectively. The highest fatty acid yield (>99%) was achieved at 350 bar and 50 °C across all groups. The biodiesel properties of all samples met ASTM and EN standards. These findings indicate that the combination of stress-induced lipid accumulation and SC-CO₂ extraction represents an efficient strategy for biodiesel production from Chlorella vulgaris.https://jaem.qom.ac.ir/article_4575_85e048e2fd9ab23eaa67d91215e12c7b.pdf