Ionic liquids-assisted preparation based

The use of ultrasonic irradiation for producing nanomaterials has been a research topic of great interest (Dhasn et al., 1999). This is due to the simplicity of sonochemical method, the cheap price of the equipment and that in many cases the as-prepared material is obtained in the crystalline phase. The ultrasonic-assisted aqueous room tempjerature ionic liquid method was applied to prepare zinc sulfide and zinc oxide nanomateiials (Zheng et al. 2010 Jia et al. 2010), among many other nanomatreials. Selection of the room temp>erature ionic liquid was mainly based on the fact that it can be obtained at a relatively low price and the method for its synthesis is simple. 

Certain quaternary salts of imidazoles have become important as ionic liquids, in particular salts of l-butyl-3-methylimidazolium (bmim). Preparation of imidazolium-containing ionic liquids, in the desired product ionic liquid as a solvent, is a virtually solvent-free, one-pot process proceeding in good to excellent yields <2003S2626>. There are also microwave-assisted, solvent-free processes for the preparation of imidazolium-based ionic liquids <2001CC643, 2003GC181>. 

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