Sound absorption properties of porous composites fabricated by a hydrogel templating technique

摘要: We have used a hydrogel templating technique followed by the subsequent evaporation of water present to fabricate porous cement and PDMS composites, we analyzed their sound absorption properties. All experiments were carried out with slurries broad bead size distributions. Porous composites produced porosities up 80% 70%, respectively. Scanning electron microscope analysis shows fibrous domains within voids created in samples open pore network initial content higher than 70 vol%. Sound was improved respect control nonporous all 60 vol%, where an structure formed. The this method show better at 200–400 Hz 1200–1800 frequency ranges when compared intermediate frequencies range between 400 1000 Hz.