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The small angle x-ray scattering (SAXS) and wide angle x-ray scattering (WAXS) is measured for RTMS containing aliphatic quaternary ammonium cation and bis(trifluoromethyl sulfonyl) imide anion. For the system containing trimethylammonium aliphatic quaternary ammonium cation; [N111n]+, it is shown that a new peak at low q-value is confirmed above n=5. It is suggested that this new peak is of the local ordering structure formed by van der Waals force between alkyl chains of ammonium cations. The other room temperature molten salts such as [Nnnnn]+(n-5-6), [N1123]+, N- methyl-n-propyl piperidium cation [PP13]+ and N-methyl-n-propyl pyrrolidinium cation [P13]+ having the same anion; TFSI- were also used. The layer spacing (d) of this ordering structure is decrease with increase of the temperature.

Ordered Structure in Room Temperature Molten Salts Containing Aliphatic Quaternary Ammonium Ions