This compilation of papers includes the proceedings from two distinguished conferences: the 8th International Conference on Nanoscience and Technology (ICNST 2025, Chiang Mai, Thailand, from July 2 to 5, 2025) and the 9th International Conference on Materials Sciences and Nanomaterials (ICMSN 2025, Oxford, United Kingdom, from July 8 to 11, 2025). The collected articles will be beneficial for specialists in nanomaterials, engineering materials, environmental engineering, electronics and related technologies across various industrial branches.