期刊
JOURNAL OF CHEMICAL PHYSICS
卷 129, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2950095
关键词
-
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Grants-in-Aid for Scientific Research [18068012] Funding Source: KAKEN
The sound absorption coefficient alpha and sound velocity nu(S) have been measured for 1-alkyl-3-methylimidazolium hexafluorophosphate [Cn mim]PF6, with n = 8,6,4 and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C4 mim]TFSI, at the frequencies of 11.3, 34.9, and 57.7 MHz in the temperature range from 293 to 393 K. From the obtained alpha and available viscosity data, [Cn mim]PF6 with large n proves to be no longer Newtonian liquids at room temperatures. Applying a Maxwell viscoelastic model with the elastic modulus G of a spring and the shear coefficient gamma of a dashpot to the experimental frequency dependence of alpha, one finds that G is insensitive to n, while the relaxation time tau(=gamma/G), which is on the order of nanoseconds, does depend on n. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2950095]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据