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Sound-absorbing materials (SAMs) are important for extensive acoustic applications, due to widespread demand for constructing tailored acoustic environments. This Perspective introduces the conservation qualities of SAMs that fundamentally govern their absorption potentials. Based on these conservation qualities, the authors offer an overview of the progress in SAMs from single-resonant to coupled-resonant systems, and outline significant results, advanced modulation techniques, and innovative design concepts. Finally, they provide an outlook on future directions for the development and application of SAMs, such as multifunctional materials and metaliners.
Huang et al. (Thu,) studied this question.