Université de Bordeaux, CNRS, UMR 5295, I2M-APy, F-33405 Talence, France.
J Acoust Soc Am. 2013 Apr;133(4):1996-2003. doi: 10.1121/1.4792140.
The influence of size polydispersity on the resonant acoustic properties of dilute emulsions, made of fluorinated-oil droplets, is quantitatively investigated. Ultrasound attenuation and dispersion measurements on various samples with controlled size polydispersities, ranging from 1% to 13%, are found to be in excellent agreement with predictions based on the independent scattering approximation. By relating the particle-size distribution of the synthesized emulsions to the quality factor of the predicted multipolar resonances, the number of observable acoustic resonances is shown to be imposed by the sample polydispersity. These results are briefly discussed into the context of metamaterials for which scattering resonances are central to their effective properties.
本文定量研究了尺寸多分散性对由含氟油液滴组成的稀乳液的共振声特性的影响。通过对具有 1%至 13%的受控尺寸多分散性的各种样品进行超声衰减和色散测量，发现与基于独立散射近似的预测非常吻合。通过将合成乳液的粒径分布与预测多极共振的品质因数相关联，表明可观测的声共振数量受样品多分散性的限制。这些结果简要讨论了用于声超材料的情况，其中散射共振是其有效特性的核心。
