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Study of hydrodynamic analysis of eco-friendly buoys with biodegradable plastic materials
조재상 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.5
The use of polystyrene (EPS) in ocean farming has recently changed to eco-friendly materials such as polyethylene (PE) and polypropylene (PP). However, despite this shift, PE and PP still contribute to microplastic generation owing to their vulnerability in marine environmental conditions and potential collisions with ships. Fragmented micro-plastics continue to occur due to the use of plastic materials without fundamental material conversion. Therefore, the development of an ocean farming buoys utilizing biode-gradable materials such as polylactic acid (PLA) is in progress. As biodegradable materials have higher density than existing PPs and PEs, buoys crafted from PLA are heavier than those made from conventional materials. Accordingly, the buoys may sink and the buoyancy or productivity of farmed organisms may decrease. Therefore, in this study through hydrodynamic diffraction and response analysis, a weight of PP, PE, or PLA was applied to each buoy, and the kelp weight was assigned and compared to each buoy for analysis.
조재상,장웅식,박소윤,김병기,왕동환 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
In this research, ligand exchanged silver nanoparticles (Ag NPs) were incorporated into perovskite by an effective method during the solvent treatment. Since PVP-capped or bare-Ag NPs tend to aggregate in organic solvents, the original capping agent was replaced by propanethiol which reduced aggregation and enhanced thermal stability, which was confirmed by Zeta-radius measurement and morphological analysis. Accordingly, Ag NPs with propanethiol improved light absorption by facilitating scattering which contributed to increased charge generation/transport with reduced recombination. The effective ligand exchange and incorporation method can be a useful approach for device stability between Ag NPs and methyl ammonium lead halide perovskite.