Controllable Self-assembly Of Imidazole Ionic Liquid With Liquid Crystal Properties

The appliancation of ionic liquids?ILs?has been widely studied in various fields due to their unique properties?e.g.Wide liquid range,high ionic conductivity,low volatility,non-combustibility,high electrochemical and thermal stability?.Ionic liquids by specially designed are liquid crystalline.Due to the orderliness of ionic liquid crystals,it can be used as a precursor to combine with various inorganic materials to prepare new functional composite materials.In this paper,imidazole ionic liquid(C₁₂MC₁₂)and biphenylimidazole ionic liquid?CBphCM/CBphC-M-C?were synthesised by the traditional heating and refluxing method.The complexes of ionic liquid-encapsulated polyoxometalate(C₁₂MC₁₂-SiW₁₂)were synthesized by C₁₂MC₁₂2 and H₄SiW₁₂O₄₀0 through electrostatic interaction.Thermogravimetric analysis shows that C₁₂MC₁₂-SiW₁₂2 has good thermal stability.DSC and POM indicate that C₁₂MC₁₂2 has thermotropic liquid crystal properties and is a smectic A phase.The liquid crystal properties of C₁₂MC₁₂-SiW₁₂disappear.Variable temperature XRD analysis shows that C₁₂MC₁₂2 and C₁₂MC₁₂-SiW₁₂2 are both standard layered structures.The hydrophilicity of the complexes formed by the electrostatic interaction between CBphC-M-C and Na₁₆P₄W₃₀Cu₄?H₂O?₂O₁₁₂12 was decreased and it had good solubility in organic solvents.The adsorption of polyoxometalates can transfer graphene from the aqueous phase to the organic phase.The UV-vis analysis showed that graphene can be stably dispersed in the organic phase.Meantimes,to produce graphene liquid crystal composites with controllability,ionic liquid crystal-graphene composite material?CBphCM-GO?were synthesized by CBphCM and GO through electrostatic interaction.The UV-vis,Raman and XPS spectra show that CBphCM can partially reduce graphene oxide.DSC and POM show that CBphCM and CBphCM-GO have similar liquid crystal properties.Variable temperature XRD analysis showed that both CBphCM and CBphCM-GO were arranged in a layered structure in the liquid crystal phase.CBphCM placed in the interlayer gaps of GO can prevent the aggregation of graphene layers.The unique optical properties of Quantum dots have made an attractive platform for the development of noval luminescent composite material.CdTe quantum dots and citrate carbon quantum dots with carboxyl groups on the surface were synthesized.The luminescent liquid crystal materials?CBphCM-CdTe/CBphCM-CQDs?were synthesized by CBphCM and CdTe/CQDs through electrostatic interaction.The CBphCM-CdTe and CBphCM-CQDs formed cluster-like complexes with quantum dots as the core and CBphCM as the shell.DSC and POM shows that the composite has liquid crystal properties.Fluorescence spectrum analysis shows that the complex has good fluorescence due to the existence of quantum dots.CBphCM-CdTe clusters are arranged in layers with each other.Increasing temperature was used to trigger fluorescence resonance energy transfer between CBphCM and CdTe.The additive effect makes the fluorescence intensity of CBphCM-CQDs significantly improved due to the maximum emission peaks of CQDs and CBphCM are close to each other.