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

doi:10.1088/1674-1056/23/5/054302

Abstract 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× 10⁴ 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× 10⁵ to 1× 10⁶, 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.

Keywords: acoustic nonlinearity parameter molecular structure modified thermodynamic method silicone oil

Received: 13 July 2013
Revised: 17 September 2013
Accepted manuscript online:

PACS:	43.25.+y	(Nonlinear acoustics)
	43.80.+p	(Bioacoustics)

Fund: 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).

Corresponding Authors: Zhang Dong
E-mail: dzhang@nju.edu.cn

About author: 43.25.+y; 43.80.+p

Cite this article:

Zhang Zhe (张喆), Chen Gong (陈功), Zhang Dong (章东) Molecular structure dependence of acoustic nonlinearity parameter B/A for silicone oils 2014 Chin. Phys. B 23 054302

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