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    • P3HT-Based Semi-Conductive Electrospun Nanocomposite Fibrous Emitters Doped with CsPbBr3 Perovskite Quantum Dots
    Authors: Papaparaskeva, Georgia; Ioannides, Maria Lydia; Lambride, Chryso;  Advisor: -;  Co-Author: - (2023)

    Poly(3-hexylthiophene-2,5-diyl) (P3HT)-based semiconducting electrospun nanocomposite fibrous emitters were successfully fabricated by combining P3HT with poly(ethylene oxide) (PEO) and commercially available CsPbBr3 perovskite quantum dots (PQDs). The latter were employed as a synergistic photoluminescence emitter of high efficiency within the P3HT/PEO blended polymer matrix, while PEO was used as an auxiliary polymer to assist the electrospinnability of P3HT. The produced materials were characterized with respect to their chemical composition and morphology by scanning electron microscopy (SEM) and transmission electron microscopy/energy-dispersive x-ray analysis (TEM/EDX) whereas fluorescence microscopy and spectroscopy were employed to study their optical properties.
    • Analysis of the As-Cast Microstructure and Properties of the Ni-Based Superalloy MAR-M247® Produced Via Directional Solidification
    Authors: Rakoczy, Łukasz; Grudzień-Rakoczy, Małgorzata; Cygan, Rafał;  Advisor: -;  Co-Author: - (2023)

    The presented research investigates MAR-M247® Ni-based superalloy castings produced via directional solidification at various mold preheating temperatures (1510, 1566 °C) and withdrawal rates (3.4, 5.0 mm/min). Casting analyses were carried out via thermodynamic simulations, differential scanning calorimetry (DSC), X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), scanning transmission electron microscopy (STEM), and tensile testing. On DSC curve, four effects have been registered during cooling: liquidus (1337 °C), formation of eutectic γ − γ′ (1315 °C), precipitation of Ni7(Hf, Zr)2 (1244 °C), and M5B3 borides (1201 °C). The castings’ primary and secondary dendrite arm spacing decreases with increasing w...