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| Sample | Nanocomposite | Amount of polymer (wt%) | Resin wt% | Thickness (mm) | RL (dB) |
|---|---|---|---|---|---|
| 1 (single-layer) | Fe3O4/HNTs-60% PS | 60 | 60 | 3 | −5.07 |
| 2 (bilayer) | 60 | 85 | −11.74 | ||
| 3 (bilayer) | 60 | 90 | −9.71 | ||
| 4 (single-layer) | 60 | 60 | 4 | −6.88 | |
| 5 (bilayer) | 60 | 85 | −26.9 | ||
| 6 (bilayer) | 60 | 90 | −10.72 | ||
| 7 (bilayer) | Fe3O4/HNTs-72% PS | 72 | 85 | 3 | −7.05 |
| 8 (bilayer) | 72 | 85 | 4 | −7.4 | |
| Pure resin | — | 0 | 100 | 3 | −1.7 |
