Pohang University of Science and Technology · Engineering
Professor Sun Ig Hong's research lab specializes in advanced materials science, focusing on the synthesis and characterization of functional nanomaterials, particularly biocompatible ZnO nanoparticles via green synthesis methods using natural plant extracts. The lab also conducts in-depth investigations into the deformation mechanisms and creep behaviors of high-entropy alloys, especially CoCrFeMnNi, under extreme conditions such as cryogenic temperatures. Their work combines experimental techniques like XRD, SEM, TEM, and thermal activation analysis to understand atomic-level mechanisms governing mechanical properties and structural stability.
Figures are computed from collected data and may differ slightly.
In this work we aim to synthesize biocompatible ZnO nanoparticles from the zinc nitrate via green process using leaf extracts of the Costus pictus D. Don medicinal plant. FTIR studies confirm the presence of biomolecules and metal oxides. X-ray diffraction (XRD) structural analysis reveals the formation of pure hexagonal phase structures of ZnO nanoparticles. The surface morphologies of ZnO nanoparticles observed under a scanning electron microscope (SEM) suggest that most ZnO crystallites are h
In the present work, the deformation mechanisms of the CoCrFeMnNi high-entropy alloy at 77 K were investigated using thermal activation analyses. The strain rate jump test was performed to estimate strain rate sensitivity and the activation volume of the alloy. Transmission electron microscopy analyses were performed to identify the evolution of twins at low temperatures. The insensitivity of activation volume to strain observed in the CoCrFeMnNi alloy at 77 K was different from the observed inc
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