Sustainable and more efficient method for sound absorption and thermal insulation

https://phys.org/news/2023-05-sustainable-efficient-method-absorption-thermal.html

"pectin converted into freeze-dried porous outperform commercial sound absorption such as glass and wool... pores various dimensions and scales... waste streams that are already being produced... local K-market for waste exchange and a chance to collect the orange peels from their juice pressing machine"