Relationship between mesoscale dynamics and shear relaxation of ionic liquids with long alkyl chain

被引：39
|
作者：
Yamaguchi, Tsuyoshi [1 ]
Mikawa, Ken-ichi [1 ]
Koda, Shinobu [1 ]
Fujii, Kenta [2 ]
Endo, Hitoshi [2 ,3 ]
Shibayama, Mitsuhoro [2 ]
Hamano, Hiroshi [4 ]
Umebayashi, Yasuhiro [4 ,5 ]
机构：
[1] Grad Sch Engn, Dept Mol Design & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[2] Univ Tokyo, Inst Solid State Phys, Neutron Scattering Lab, Kashiwa, Chiba 2778565, Japan
[3] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Neuron Biophys Grp, Tokai, Ibaraki 3191195, Japan
[4] Kyushu Univ, Fac Sci, Dept Chem, Higashi Ku, Fukuoka 8128581, Japan
[5] Niigata Univ, Grad Sch Sci & Technol, Nishi Ku, Niigata 9502181, Japan
来源：
JOURNAL OF CHEMICAL PHYSICS | 2012年 / 137卷 / 10期
关键词：
TEMPERATURE; DIFFRACTION; WATER; HEXAFLUOROPHOSPHATE; SEGREGATION; DEPENDENCE; MORPHOLOGY; SCATTERING; VISCOSITY;
D O I：
10.1063/1.4751547
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The shear relaxation spectra of three imidazolium-based ionic liquids, 1-methyl-3-octylimidazolium chloride ([C(8)mim][Cl]), 1-methyl-3-octylimidazolium hexafluorophosphate ([C(8)mim][PF6]), and 1-dodecyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide ([C(12)mim][TFSA]) were measured and compared with the intermediate scattering functions determined with neutron spin echo (NSE) spectroscopy. The shear relaxation is slower than that predicted from the relaxation of the main peak of the structure factor that is common to other molecular liquids, whereas it is faster than that from the relaxation of the pre-peak, that corresponds to the correlation length of about 10 nm specific to ionic liquids with an intermediately long alkyl chain. The role of the pre-peak structure in the mechanism of shear viscosity of ionic liquids is discussed based on the comparison between NSE and shear relaxations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4751547]
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页数：7
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