科研之友
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摘要
Pyrrolidinium-based surface active ionic liquid (SAIL), N-butyl-N-methylpyrrolidinium dodecyl sulfate ([C4MP][C12H25SO4]), was synthesized and its aggregation behavior was regulated by varying the concentration of SAIL and composition of H2O-ethylammonium nitrate (EAN) mixed solvent. Particularly interesting is that [C4MP][C12H25SO4] could not only form diverse lyotropic liquid crystals (LLCs), viz. hexagonal (H-1) and lamellar liquid crystal (L-alpha) phases, in the water-rich environment, but also serve as an effective small molecule gelator and construct weak gel (W) and gel (G) in EAN-abundant binary solvent. The microstructures of LLC phases (H-1 and La phases) were observed by polarized optical microscopy (POM). Small-angle X-ray scattering (SAXS) results affirm that the gels formed by different concentration of SAIL have the nearly constant interlayer spacing, and the H-1 phase at higher [C4MP][C12H25SO4] concentration has a lower distance between the neighboring cylinders. Rheological measurements testify that the viscoelasticity of LLC phase reduces with the increasing content of EAN in the mixed solvent whereas increases with increase in concentration of SAIL. This work provides new insights into the aggregation behavior of SAILs in mixed solvents and the aggregates investigated may have potential applications in some fields, e.g. materials preparation and drug delivery, etc.
