Magnetic modulation of the transport of organophilic solutes through Supported Magnetic Ionic Liquid Membranes

• Magnetic field influence on the transport through SMILMs has been demonstrated.
• Magnetic field increases the permeability and diffusion coefficient of specific solutes.
• MILs properties can be magnetically modulated improving the membrane stability.

The present work evaluates the influence of magnetic field on the transport of two model organic compounds, ibuprofen and α – pinene, through supported magnetic ionic liquids membranes (SMILMs). The membranes studied were prepared by incorporation of magnetic ionic liquids (MILs), [C11H21N2O]3 [GdCl3Br3], [C4mim] [FeCl4] and [C8mim] [FeCl4]. Transport studies were conducted in the absence and presence of a magnetic field with an intensity of 1.2  T.The results obtained show that the magnetic field increases the diffusion coefficient of ibuprofen and α – pinene, improving their transport through the SMILM. The two transport studies performed, α – pinene in dodecane through a SMILM with [C4mim] [FeCl4], and α – pinene in hexane through a SMILM with [C8mim] [FeCl4], revealed a permeability increase of 51% and 29% respectively when exposed to the magnetic field, whereas transport studies of ibuprofen in dodecane through [C11H21N2O]3[GdCl3Br3] MIL showed a permeability increase of 59% under the same magnetic field conditions. The analysis of the magnetic field influence on solute permeation revealed that the permeability increase observed cannot be solely interpreted due to a decrease of MILs viscosity induced by the magnetic field. The magnetic dependence of solutes solubility in the MILs should also be considered.

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