Advanced Acoustic and Thermal Insulation Materials: Mechanisms, Development, and Multifunctional Applications
DOI:
https://doi.org/10.64229/zwqq9k61Keywords:
Thermal Insulation, Acoustic Absorption, Sound Insulation, Sustainable Materials, Multifunctional Composites, Building Physics, Life Cycle AssessmentAbstract
The escalating demands for energy efficiency and acoustic comfort in building, transportation, and industrial sectors have propelled intensive research and development in advanced insulation materials. This review provides a comprehensive overview of the fundamental mechanisms, material types, recent advancements, and multifunctional applications of both acoustic and thermal insulation materials. While often treated separately, the interplay and occasional conflicts between acoustic and thermal properties are crucial for developing integrated solutions. We begin by elucidating the fundamental physics of heat transfer (conduction, convection, radiation) and sound propagation (absorption, insulation, damping) to establish a clear mechanistic foundation. The article then systematically categorizes and analyzes traditional and emerging materials, including fibrous materials (mineral wool, bio-fibers), cellular materials (polyurethane, polystyrene, aerogels), and resonant structures, with a dedicated discussion on acoustic and thermal metamaterials. A significant focus is placed on sustainable and bio-based materials, nanomaterial-enhanced composites (e.g., aerogels, vacuum insulation panels), and smart/adaptive materials. The performance of these materials is critically evaluated based on key metrics such as thermal conductivity (λ), Sound Transmission Class (STC), and Noise Reduction Coefficient (NRC). Furthermore, the review explores the synergistic design of multifunctional materials and systems that provide concurrent thermal and acoustic insulation, a key frontier in material science. A dedicated section on performance optimization and modeling discusses how computational tools, including multi-scale modeling and machine learning, are accelerating material discovery. Finally, we discuss current challenges, such as balancing performance with sustainability, cost, fire resistance, and durability, and offer perspectives on future research directions, including the role of AI-driven material design, circular economy principles, and advanced manufacturing.
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