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In this research, flexible semi‐open cell polyurethane (PU) foams incorporating silicon dioxide (SiO2) nanoparticles are produced to have improved acoustic damping. Nanoparticles of different loading fractions and various sizes are employed to achieve improvement in sound absorption of foams. The effect of SiO2 nanoparticles’ size on the acoustic damping of PU foams, which is investigated in this...