Simultaneous evaluation of ultrasound velocity, attenuation and density of polymer solutions observed by multi-echo ultrasound spectroscopy
Simultaneous evaluation of ultrasound velocity, attenuation and density of polymer solutions observed by multi-echo ultrasound spectroscopy
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DOI：
10.1016/j.ultras.2010.08.005
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发表时间：
2011-02-01
期刊：
影响因子：
4.2
通讯作者：
Tran-Cong-Miyata, Qui
中科院分区：
文献类型：
--
作者：
Norisuye, Tomohisa;Sasa, Satoshi;Tran-Cong-Miyata, Qui
超声光谱是研究材料粘弹性的有力工具。纵向弹性模量M′和M′，即绝热压缩系数kappa(S)可以由超声速度nu和衰减系数a通过关系式M′= rho nu(2)和M′= 2 rho alpha nu(3)/ ω来计算，其中rho为密度，ω为角频率。到目前为止，密度是由其他设备独立测量的，或者在化学反应过程中密度的变化在以往的文献中被忽略。在这里，我们提出了一种多重回声方法来同时评估α， nu, rho，从一个单一的采集，使我们能够监测丙烯酰胺的聚合过程，其中三个参数在反应过程中独立变化。这使我们能够更好地理解聚合物或胶凝体系的声学参数的时间演变。(C) 2010 Elsevier B.V.版权所有
Ultrasound spectroscopy is a powerful tool to investigate the viscoelastic properties of materials. The longitudinal elastic moduli M' and M '', or the adiabatic compressibility kappa(S) can be evaluated from ultrasound velocity nu and attenuation coefficient a via the relation M' = rho nu(2) and M '' = 2 rho alpha nu(3)/omega, where rho is the density and omega is the angular frequency. So far, the density was independently measured by other equipments or its variation during the chemical reaction has been ignored in the previous literatures. Here we propose a multiple echo method to simultaneously evaluate alpha, nu, rho, from a single acquisition, enabling us to monitor the polymerization process of acrylamide, where the three parameters vary independently during the reaction. This allows us to analyze the time evolution of the acoustic parameters for polymeric or gelling systems with the better understanding. (C) 2010 Elsevier B.V. All rights reserved.