Manipulation Of Magnetic Ionic Liquids Droplet And Its Application In Energy Harvesting

The research and application of new materials has always been one of the hot topics in the field of technological innovation.Ionic liquids have received increasing attention as a novel class of green versatile solvents or functional soft materials and have been used in many fields,due to their unique physicochemical properties,such as wide liquid range,vanishingly low vapor pressure,higher ionic conductivity,excellent solubility,thermal stability,and individually customized by rationally modulating the combination of cations and anions.Magnetic ionic liquids not only have above mentioned advantages,but also exhibit paramagnetic behavior in an applied external magnetic field.These properties make magnetic Ionic liquids have more advantages and potential application prospects than conventional Ionic liquids in the fields of microfluidic.At present,the research on the performance of magnetic ionic liquids is less,and the behavior of pure Magnetic ionic liquids on hydrophobic surface has not been reported.The study of this paper revolves around new materials for magnetic ionic liquids(Select the typical of two magnetic ionic liquids: 1-ethyl-3-methylimidazolium tetrachloroferrate([Emim][FeCl4])and1-Butyl-3-methylimidazolium tetrachloroferrate([Bmim][FeCl4])).Manipulating discrete magnetic Ionic fluid droplets by magnetic fields on hydrophobic surface,we found some new phenomenon which we discussed later.First,by increasing or reducing the magnetic field on two kinds of magnetic ionic liquids droplet which is limited to three different volume,the change of magnetic ionic liquids droplet shape was studied.The experimental results showed that the change of the magnetic field can cause the contact angle of the magnetic ionic liquids droplet to change,and the normalized droplet diameter(The contact diameter of the droplet with the Teflon film)and the normalized height of the two magnetic ionic liquids droplet presented hysteresis phenomenon in the case of different volume;The deformation of droplet under magnetic field was studied at three temperature conditions(25?,40?,60?).From the normalized droplet diameter and the normalized height of the two magnetic ionic liquids droplet,both liquids showed good robustness to temperature changes.Then,the magnetic ionic liquids droplet are pulled in the horizontal direction by the magnet field.We find that the movement of magnetic ionic liquids droplet can be driven by magnetic field.The ablity to drive droplet is not only up to the strength of the magnetic field but also directly related to the size of the droplet.The stronger the magnetic field,the larger the droplet volume,the more easily the magnetic ionic liquids droplet are driven.When the magnetic field is invariant,magnetic ionic liquids droplet at different sizes and types acquire maximum speed by the interaction of friction and air resistance.The last part,the interdigital electrodes is etched into the ITO(Indium Tin Oxide)conductive glass,and the Teflon film is coated on its surface and then charged.The magnetic ionic liquids droplet are pulled on the charged Teflon film by the applied magnetic field.The electrostatic energy harvester under the magnetic field is studied.The peak value of the output voltage was 4V,and the average output power for 20?l was obtained at 78 nW.The manipulation of individual real pure magnetic ionic liquids droplet without adding or dispersing magnetic particles,allows the magnetic droplet is persistent and neither aging nor phase separation takes place.It has potential application for microfluidic devices design,trapping transport separation purification and other chemical application.