Mojtaba Rahimabady, Eleftherios Christos Statharas, Kui Yao, Meysam Sharifzadeh Mirshekarloo, Shuting Chen, and Francis Eng Hock Tay, “Hybrid local piezoelectric and conductive functions for high performance airborne sound absorption,” Applied Physics Letters, Vol. 111, No. 24, 241601, 2017, DOI: 10.1063/1.5010743.
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 polar structure and the electrical resistive loss of SWCNT enhanced sound energy conversion to electrical 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 conductivity percolation threshold. For the optimal composition of PVDF/5 wt% SWCNT, sound reduction coefficient of larger than 0.58 has been obtained, with high sound absorption coefficient higher than 50% at 600 Hz, showing their great values for passive noise mitigation even at low frequency.
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Funding Info:
This material is based on research supported in part by the Singapore Ministry of National Development and National Research Foundation under L2NIC Award No. L2NICCFP1-2013-9, with project code of IMRE/14-9P1112 at IMRE.
Description:
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 111, 241601 (2017) and may be found at https://doi.org/10.1063/1.5010743