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Phase behavior and characterization of magnetic microemulsions contain pentaalkylguanidinium-based magnetic room temperature ionic liquids (MRTILs)

Abstract

Magnetic microemulsions with magnetic properties were formulated and optimized at 25℃ by using a series of pentaalkylguanidinium-based magnetic room temperature ionic liquids (MRTILs) 1,1,3,3-tetramethyl-4-alkylguanidinium bromotrichloroferrate (III) [CnTMG][FeCl3Br] (n = 2, 4, 6, 8) as polar phase, different aliphatic oils as nonpolar phase, and a proper mixture of nonionic surfactant Triton X-100 (TX-100) and different short-chain aliphatic alcohols as cosurfactant. The phase behaviors of these microemulsions were investigated by cloud titrations method and revealed that the case of cyclohexane as nonpolar phase coupled with a TX-100/1-pentanol mole ratio of 1:3 showed most excellent ability to formulate MRTILs-based microemulsions, the range of monophasic region was expanded with increasing alkyl chain length attached to the =NRH+ group of MRTILs cation. Based on conductivity measurements, the classical structure sequence of oil-in-MRTILs (O/MRTILs), bicontinuous sponge structure (BC) and inverse MRTILs-in-oil (MRTILs/O) microemulsions was observed with increasing m(Oil)/m(MRTILs) ratio. Dynamic light scattering (DLS) and Cryo-high resolution scanning electron microscopy (Cryo-SEM) measurements showed that microemulsions droplets with the size about 3 to 7 nm were formed in the MRTILs/O subregions, and the droplet size was increased with increasing MRTILs concentrations. Magnetic susceptibility and Rheological measurements revealed that these MRTILs-based microemulsions are with strong magnetic susceptibility and low viscosity over the whole optically clear range of composition. These comprehensive investigations are supposed to provide useful information for formulating analogue MRTILs-based microemulsions, these magnetic microemulsions have interesting potential applications based on a manipulation via external magnetic field.

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Publication details

The article was received on 03 Mar 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01049H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Phase behavior and characterization of magnetic microemulsions contain pentaalkylguanidinium-based magnetic room temperature ionic liquids (MRTILs)

    X. Dai, X. Qiang, J. Gao, J. Teng, H. Zang and H. Song, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01049H

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