Nanoscale organization in piperidinium-based room temperature ionic liquids

Area of Science:

• Materials Science
• Physical Chemistry

Background:

• Ionic liquids (ILs) are salts that are liquid below 100°C.
• N-alkyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ILs are a class of ILs with potential applications.

Purpose of the Study:

• To investigate the complex phase diagram of N-alkyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ILs.
• To determine the structural order of these ILs in the molten state.

Main Methods:

• Phase diagram analysis using complementary techniques.
• Small-angle and wide-angle X-ray scattering (SAXS/WAXS) for structural analysis.

Main Results:

• The phase diagram exhibits complex behavior.
• SAXS/WAXS data reveal aggregation of piperidinium aliphatic alkyl chains.
• Formation of distinct alkyl domains within polar regions observed in the molten state.

Conclusions:

• The structural organization in molten N-alkyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ILs is characterized by domain formation.
• This aggregation behavior is similar to other studied ionic liquids, suggesting a general principle of self-organization.