The Effect of Silica Nanoparticles and nanodye on the Acoustic Absorption Rate of Nano-Composite Based on Hydrolyzed Cotton and Gypsum

Exposure to noise pollution in the workplace is one of the most common occupational hazards and causes hearing loss. One of the ways to control voice in the control industry is by audio absorbers. Nanoparticles can be used to composite materials. The purpose of this study was to design and construct acoustic panels based on gypsum, silicon oxide nanoparticles, hydrolyzed cotton and nanodye, as well as to compare the absorbance of sound by them at various frequencies.
In this study, the nanocomposite consisting of gypsum, hydrolyzed cotton, silica nanoparticles and nanodye was prepared by simple mixing and heat treatment, and then its sound absorption coefficient was investigated. The absorption coefficient was evaluated at frequencies of 250 to 5000 using static waves and in accordance with ISO 9803-1.
The results showed that the maximum difference of the absorption coefficient was 10% at 2500 Hz, and it was related to a sample consisting of gypsum, nano silica, hydolized cotton, and nanodye, compared to a pure plaster sample. The highest absorption coefficient (0.46) of the sample was from gypsum, nano silica and hydolized cotton at a frequency of 5000 Hz.
The results of this study showed that with increasing frequency, the absorption coefficient increased, but the absorption coefficient was decreased by adding nanoparticles and nanodye.