Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 128, Issue 10, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-022-05964-5
Keywords
Graphene; Ultra-light materials; Cellular materials; Noise damping
Funding
- Australian Research Council [DP160102794]
- University of Melbourne
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Graphene-based cellular monoliths (GMs) with ultralow density have been synthesized through a simple and cost-effective freeze-casting method. The GMs demonstrate excellent sound absorption properties within a certain density range, while also possessing high mechanical stability, fire retardancy, and thermal insulation capability.
Cellular materials with ultralow density (e.g., < 5 mg cm(-3)) are attractive candidates for acoustic applications due to their lightweight and other unique properties. However, it has remained a challenge to fabricate such materials. Here, we synthesized a series of graphene-based cellular monoliths (GMs) with densities from 4.01 to 0.82 mg cm(-3) using a facile and cost-effective freeze-casting procedure. The sound absorption behaviors of the ultralight GMs were explored, and the results demonstrate that the GMs with a density over 2.24 mg cm(-3) could effectively dissipate the incident sound wave energy with the sound absorption coefficient > 0.8 in a broad frequency of ranges. Together with their high mechanical stability, fire retardancy and thermal insulation capability, GMs may find applications in the domestic, industrial and defence areas.
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