A combination of the ionic liquids and liquid crystals yielded a new category of materials called ionic liquid crystals, and was found to offer the higher performance on the ion conduction compared to that in the isotropic phase. In this study, we prepare a series of DEME (N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium)-based ionic liquids and investigate their phase transition behavior. Details of the phase transition and the nature of the phase will be discussed. In addition, an influence of the length of the terminal alkyl chain and the water content in the samples on the phase behavior was investigated.
