Fig. 4: Sound absorption properties of FCNSs. | Nature Communications

Fig. 4: Sound absorption properties of FCNSs.

From: Flexible ceramic nanofibrous sponges with hierarchically entangled graphene networks enable noise absorption

Fig. 4

SEM images showing the cell walls of a FCNS10, b FCNS40, c FCNS70, and d FCNS100. e–h The corresponding absolute sound pressure distribution of various FCNSs. Schematic illustrations of the sound absorption mechanism for i open-cell walls, j semi-open cell walls, and k closed-cell walls. l Influences of GO loading amount on NRC and airflow resistance of the FCNSs. m Variation of the absorption coefficient of the relevant FCNSs. n Effects of density on the absorption coefficient of FCNSs. o NRC of FCNS-5 with various thicknesses. Error bars in l, o represent the standard deviations of three replicates.

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