PDMS-based acoustic impedance-matched material in water

Abstract eng:
Sammar_y We have created a composite material that has the same longitudinal acoustic impedance as water using Polydimetylsiloxane (PDMS) and TiOZ particles. To predict the concentration of particles needed in the PDMS matrix to obtain impedance matching to water, we used a Coherent Potential Approximation (CPA) model for dispersed particles in an elastic matrix [1]. This model predicts the shear and longitudinal moduli of the final composite system. We discuss the validity and limitation of the model and show experimentally that it is possible to achieve perfect impedance matching for longitudinal waves by adding submicron particles to a soft solid, here PDMS, and to measure its shear mechanical properties.

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