Polymer nanocomposites (PNCs) are a versatile class of materials known for their enhanced mechanical, thermal, electrical, and barrier properties, with the latter referring to resistance against the permeation of gases and liquids. Achieving optimal nanoparticle dispersion within the polymer matrix is essential to fully realizing these advantages. This study investigates strategies for improving nanoparticle dispersion and examines the impact of controlled dispersion on the resulting nanocomposite properties. Various methods, including in situ polymerization, twin screw extrusion, sol–gel processes, nanoparticle surface modification, solution casting, and advanced compounding techniques such as additive manufacturing and self-healing composites were explored to enhance dispersion and improve the compatibility between nanoparticles and polymers. The synergy between improved dispersion and enhanced functionalities—such as increased mechanical strength, thermal stability, conductivity, and chemical resistance—makes these nanocomposites highly valuable for industrial applications in sectors such as the automotive, aerospace, electronics, pharmaceuticals, and packaging industries. The key recommendations based on our findings highlight how customized nanocomposites can address specific industrial challenges, fostering innovation in materials science and engineering.

The aviation industry is a major source of greenhouse‐gas emissions and faces urgent pressure to transition to sustainable energy solutions. In this context, hydrogen energy emerges as a promising alternative to conventional jet fuels, offering the potential for zero in‐flight CO ₂ emissions. This paper critically reviews hydrogen's role in aviation, covering production methods, propulsion technologies (fuel cells and hydrogen combustion engines), and cryogenic‐storage systems. Key challenges are identified, including infrastructure development, storage complexity, safety, regulatory barriers, and economic viability. Notably, adopting liquid hydrogen is projected to increase direct operating costs by 10%–70% for short‐range and 15%–102% for medium‐range flights, mainly due to storage and supply‐chain demands. Moreover, persistent issues such as contrail formation and NO _X emissions require further attention. Despite these hurdles, hydrogen offers promising decarbonization potential through diverse propulsion pathways, including direct combustion, fuel‐cell systems, and hybrid configurations. The paper proposes a phased integration roadmap: near‐term adoption in regional aircraft, mid‐term retrofitting of existing fleets, and long‐term sector‐wide decarbonization by 2050. Coordinated policy, sustained investment, and industry‐wide collaboration are essential to overcome barriers and accelerate aviation's clean energy transition.