<p>This volume showcases the latest innovations and breakthroughs in materials engineering and nanotechnology, offering a comprehensive exploration of cutting-edge research and emerging trends. Spanning a wide array of topics—from advanced material synthesis and characterization to nanoscale science, functional composites, and sustainable technologies—it reflects the dynamic nature of these ever-evolving fields. Curated from the prestigious The 9th International Conference on Materials Engineering and Nanotechnology (ICMEN 2025), held in Kuala Lumpur, Malaysia, on November 1–2, 2025, this collection features meticulously selected papers authored by leading experts and researchers. Each contribution has undergone rigorous peer review, ensuring the highest academic standards. More than just a compilation of research, this book serves as a vital platform for knowledge exchange, fostering collaboration and inspiring innovative solutions to global scientific and technological challenges. With its broad interdisciplinary scope, it is an invaluable resource for materials scientists, nanotechnology engineers, and researchers seeking to push the boundaries of science, technology, and engineering.</p>