Md Amir Sohel is a Postdoctoral Researcher in the Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea. His research involves physical aging, degradation, and free volume analysis of polymeric and energy-related materials using positron annihilation spectroscopy, with current interests in polymer nanocomposites and irradiation effects on materials for energy storage. Asmita SenGupta is a Retired Professor and Head, Department of Physics, Visva-Bharati, Santiniketan, India. Her main research interests lie in polymer physics, biopolymers, nanocomposites, semiconductors, metals, and radiation physics, with substantial experience in performing positron experiments in various materials. Sabu Thomas is a Professor and Director of the International and Interuniversity Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala, India. Professor Thomas is internationally recognized for his contributions to polymer science and engineering, with his research interests encompassing polymer nanocomposites, elastomers, polymer blends, interpenetrating polymer networks, polymer membranes, green composites, nanocomposites, nanomedicine, and green nanotechnology. His groundbreaking inventions in polymer nanocomposites, polymer blends, green bionanotechnology, and nano-biomedical sciences have significantly advanced the development of new materials for the automotive, space, housing, and biomedical fields.