To clarify the origin of the nanostructure of ionic liquids (ILs), we have investigated two series of ILs 1-alkyl-3-methylimidazolium hexafluorophosphate (CnmimPF(6), n = 4-16, n is an alkyl-carbon number) and 1-alkyl-3-methylimidazolium chloride (CnmimCl, n = 4-14) using differential scanning calorimetry and X-ray diffraction techniques. The PF6 samples with n > 13 and the Cl samples with n > 10 exhibited the liquid-crystalline (LC) to liquid (L) phase transitions, as reported before. We found that both samples with smaller n also exhibited the LC to L transitions under supercooled states as far as the ionic motions were not frozen-in at the glass transition temperatures T-g. The T-g of the LC phase was close to that of the L phase, indicating that the characteristic length of the glass transition is shorter than that of the nanostructure. A low-Q peak due to the nanostructure in the L phase and a diffraction peak due to the layer structure in the LC phase appeared at almost the same Q positions in both samples. On the basis of the above results and some thermodynamic analysis, we argue that the nanostructures of ILs are essentially the same as the layer structures in the LC phases.
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Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Aoun, Bachir
Goldbach, Andreas
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Dalian Inst Chem Phys, Dalian 116023, Peoples R ChinaUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Goldbach, Andreas
Gonzalez, Miguel A.
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Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Gonzalez, Miguel A.
Kohara, Shinji
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Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, JapanUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Kohara, Shinji
Price, David L.
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机构:Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Price, David L.
Saboungi, Marie-Louise
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Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
机构:
Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Aoun, Bachir
Goldbach, Andreas
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h-index: 0
机构:
Dalian Inst Chem Phys, Dalian 116023, Peoples R ChinaUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Goldbach, Andreas
Gonzalez, Miguel A.
论文数: 0引用数: 0
h-index: 0
机构:
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Gonzalez, Miguel A.
Kohara, Shinji
论文数: 0引用数: 0
h-index: 0
机构:
Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, JapanUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Kohara, Shinji
Price, David L.
论文数: 0引用数: 0
h-index: 0
机构:Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France
Price, David L.
Saboungi, Marie-Louise
论文数: 0引用数: 0
h-index: 0
机构:
Univ Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, FranceUniv Orleans, CNRS, Ctr Rech, Div Mat, F-45071 Orleans 2, France