Abstract
Concentrated aqueous solution has been proven difficult to be electrosprayed due to its low viscosity, high volatility and large surface tension, while ionic liquids have been widely used in electrospray. In this paper, we successfully electrospray concentrated sodium chloride (NaCl) aqueous solution by coating it with a thin layer of ionic liquid using coaxial capillary. In this approach, we not only extend the range of the flowrate and the applied voltage where cone-jet mode of NaCl solution occurs, but also increase the spray current of the ionic liquid. The thin layer of ionic liquid largely changed the surface characteristic and weaken the strong electric field inside the liquid surface, which avoids the discharge of the NaCl solution and facilitate the formation of the compound liquid cone. The compound liquid cone remains static at a suitable flow rate (0.1 nl/s ~ 1 nl/s) of ionic liquid and vibrates at higher flow rates of ionic liquid. The spray current increased more rapidly with the flowrate of NaCl solution than that of ionic liquid.
Published Version
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