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Molecular structure dependence of acoustic nonlinearity parameter B/A for silicone oils

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O561.1[理学—原子与分子物理;理学—物理] O422.7[理学—声学;理学—物理]
作者机构：[1]State Key Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China, [2]The Traditional Chinese Medicine Hospital of Jiangsu Province, Nanjing 210029, China
相关基金：Project supported by the National Basic Research Program of China （Grant No. 2011CB707900）, the National Natural Science Foundation of China （Grant Nos. 81127901, 11174141, 61072027, and 11374155）, and the Natural Science Foundation of Jiangsu Province, China （Grant No. BE2011110）.

关键词：分子结构, 非线性声参量, 硅油, 成像技术, 声学参数, 非线性参数, 热力学方法, 聚硅氧烷, acoustic nonlinearity parameter, molecular structure, modified thermodynamic method, siliconeoil

中文摘要：

Exploring new acoustic parameters is essential to develop a noninvasive imaging technique for the surgery of silicone oil tamponades. In this study, the acoustic nonlinearity parameters B/A of varied silicone oil samples(e.g., linear or hyperbranched) are experimentally measured by using a modified thermodynamic method. The results show that:(i) when the concentration of the silicone oil with a molecular weight of 5 × 104increases from 0.5 g/100 ml to 8 g/100 ml, the corresponding B/A value increases by about 18%, but the acoustic velocity only increases by about 0.1%;(ii) when the molecular weight of the hyper-branched silicone oil is enhanced from 2 × 105to 1 × 106, the B/A value increases by about22%, while the acoustic velocity is only raised by about 0.2%. This study suggests that the B/A parameter of the silicone oil is more sensitive to the change in its molecular structure than that of the acoustic velocity. Thus, the B/A parameter might be utilized as an effective index for the development and optimization of the noninvasive imaging of the surgery of silicone oil tamponades.

英文摘要：

Exploring new acoustic parameters is essential to develop a noninvasive imaging technique for the surgery of silicone oil tamponades. In this study, the acoustic nonlinearity parameters B/A of varied silicone oil samples （e.g., linear or hyper-branched） are experimentally measured by using a modified thermodynamic method. The results show that：（i） when the concentration of the silicone oil with a molecular weight of 5 × 10^4 increases from 0.5 g/100 ml to 8 g/100 ml, the corresponding B/A value increases by about 18%, but the acoustic velocity only increases by about 0.1%; （ii） when the molecular weight of the hyper-branched silicone oil is enhanced from 2 × 10^5 to 1 × 10^6, the B/A value increases by about 22%, while the acoustic velocity is only raised by about 0.2%. This study suggests that the B/A parameter of the silicone oil is more sensitive to the change in its molecular structure than that of the acoustic velocity. Thus, the B/A parameter might be utilized as an effective index for the development and optimization of the noninvasive imaging of the surgery of silicone oil tamponades.

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