Hybrid local piezoelectric and conductive functions for high performance airborne sound absorption

Mojtaba Rahimabady, Eleftherios Christos Statharas, Kui Yao, Meysam Sharifzadeh Mirshekarloo, Shuting Chen, Francis Eng Hock Tay

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

A concept of hybrid local piezoelectric and electrical conductive functions for improving airborne sound absorption is proposed and demonstrated in composite foam made of porous polar polyvinylidene fluoride (PVDF) mixed with conductive single-walled carbon nanotube (SWCNT). According to our hybrid material function design, the local piezoelectric effect in the PVDF matrix with the polar structure and the electrical resistive loss of SWCNT enhanced sound energy conversion to electrical energy and subsequently to thermal energy, respectively, in addition to the other known sound absorption mechanisms in a porous material. It is found that the overall energy conversion and hence the sound absorption performance are maximized when the concentration of the SWCNT is around the conductivity percolation threshold. For the optimal composition of PVDF/5 wt. % SWCNT, a sound reduction coefficient of larger than 0.58 has been obtained, with a high sound absorption coefficient higher than 50% at 600 Hz, showing their great values for passive noise mitigation even at a low frequency.

Original languageEnglish
Article number241601
Number of pages5
JournalApplied Physics Letters
Volume111
Issue number24
DOIs
Publication statusPublished - 11 Dec 2017
Externally publishedYes

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