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Electrospraying (ES) is of a great interest in development of biomaterials for controlled delivery [1].By applying a suitable voltage to a conducting liquid supplied into a capillary,the liquid meniscus will take the form of a cone.Increasing the electric field on the surface of the liquid,which is intended to overcome the surface tension,facilitates the emergence of a controlled micro-sized jet from the tip of the liquid cone,this is called the stable cone-jet mode [2].The use of micro-sized fine nozzles allows the electrospray to operate at a low flow rate,which accordingly would make the delivery of small volumes and the fabrication of varied sized particles possible [3].However,the efficiency of materials printing by ES still needs to be improved.