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Raw data and code used in our paper: Mechanism of airborne sound absorption through triboelectric effect for noise mitigation

🔗 Paper link: here

🖋️ To cite: Li, J., Yousry, Y.M., Lim, P.C. et al. Mechanism of airborne sound absorption through triboelectric effect for noise mitigation. Nat Commun 15, 9408 (2024).

Raw data for figures in the main manuscript:

• Fig. 3d Effect of ECE concentration on the dielectric constant of fibrous TEC foams with corresponding polynomial fit curve y=-0.07 x^2+12.17x+37.80, r2 > 0.90.

• Fig. 3e Effect of ECE concentration on the dielectric loss of fibrous TEC foams. The zoomed view shows the ECE weight ratio range within 8%, where the linear fit is y = 0.013x+ 0.021, with a p-value less that 0.01%.

• Fig. 3f Influence of ECE concentration on the conductivity of the fibrous TEC foams.

• Fig. 3g Modulating conductivity with ECE while preserving porosity with minimized change.

• Fig. 3h, i Influence of ECE concentration on the sound absorption performance of foams. Sound absorption enhancement at j lower frequency ranges and k higher frequency ranges, respectively.

• Fig. 3l Peak sound absorption enhancement at 1170 Hz due to triboelectric effect, significant enhancement from 1120-1290 Hz.

• Fig. 3m NRC in relation to conductivity follows a similar trend as the sound absorption coefficient. The fitted curves are hyperbolic, where for 1170 Hz is y=(0.784 x)/(2.648×10^(-7)+x), and for 1600 Hz the fit is y=(0.953 x)/(1.275×10^(-7)+x).

• Fig. 4b Comparison of noise reduction coefficient (NRC) for TECs made of PP/PVDF, GW/PVDF, and PU/PVDF, with and without ECE, concentration of the conducting elements satisfies the percolation threshold at 5 wt.% in the final composite material.

• Fig. 4c Prominent improvement in NRC among groups. The error bars represent standard deviations over at least three samples.

• Sound absorption coefficients of:

• Fig. 4d TEC foams made of PP/PVDF/ECE forming triboelectric dissipators, in comparison with PP/PVDF and PP.

• Fig. 4e TEC foams made of GW/PVDF/ECE forming triboelectric dissipators, in comparison with GW/PVDF and GW.

• Fig. 4f TEC foams made of PU/PVDF/ECE forming triboelectric dissipators, in comparison with PU/PVDF and PU.

• Fig. 5a Distribution of NRC of acoustic absorbers with triboelectric effect. The dots represent NRC values of acoustic absorber samples with different types and varying absorber thickness. The curve on the sub-axis of the vertical coordinate represents the distribution of NRC values. Despite reduced thickness, triboelectric-enabled absorbers surpass acoustic absorbers made of single materials, composite materials, or layered structures.

• Fig. 5b NRCs of acoustic absorbers with triboelectric effect outperforms other groups without.

• Fig. 5c Sound absorption coefficient of PU-based TEC foam shows higher sound absorption over commercial counterpart.

• Fig. 5d Superior performance of PU-based TEC foam in comparison with a variety of commonly used commercial products.

Code for figures in the manuscript:

• Fig. 2b Geometric representation of adjacent fibers with a projected overlapping area S and intersecting angle β. Probability distribution of β from the Monte Carlo simulation, showing a Gaussian distribution β~(π/2,33.6).

• Fig. 5a Distribution of NRC of acoustic absorbers with triboelectric effect. The dots represent NRC values of acoustic absorber samples with different types and varying absorber thickness. The curve on the sub-axis of the vertical coordinate represents the distribution of NRC values. Despite reduced thickness, triboelectric-enabled absorbers surpass acoustic absorbers made of single materials, composite materials, or layered structures.