This book compiles the collective expertise and forward-thinking research results which were presented at two distinguished gatherings: the 9th International Conference on Materials Engineering and Nanoscience (ICMENS 2025) and the 9th International Conference on Materials Engineering and Manufacturing (ICMEM 2025). Held jointly in Kyushu University, Fukuoka, Japan, from March 21 to 24, 2025, these conferences brought together leading researchers, engineers, industry professionals, and students from around the world to explore the latest advancements in materials science, nanotechnology, and manufacturing technologies.