Nanomembranes and Urban Vehicles: A Simple Way to Minimize Urban Noise

Urban noise is considered a growing problem in major cities around the world. This paper explores the development of a nanomembrane-based material for noise attenuation. The experimental results show that a combination of acoustic foam and nanomembranes can act as a Helmholtz resonator. The average sound absorption coefficient was around 90%, with peak frequencies varying from 2400 Hz to 4000 Hz. The average thickness of the nanomembranes was approximately 5.0 µm, while the acoustic foam was 13 mm thick. The mean noise reduction, around 10 dB, depends on the morphology of the nanomembranes, their thickness, and their pore size.