Analysis of Multiple Taylor Cones and Selective Nanofiber Deposition via Near-Field Electrospinning Technique

In both conventional electrospinning and NFES (Near-Field Electrospinning) processes, the applied electrical field should be capable of generating forces with equivalent-or-greater-than local surface tension in order to deform and elongate the polymer droplet into a conical shape called a Taylor cone. Experimental results on controlled formation of multiple Taylor cones demonstrate consistent semi-cone angles between 68° to 72°, which are comparable to the original NFES process and irrespective to the number of Taylor cones. In addition, we also report a new method for selectively depositing nanofibers by taking advantage of field enhancement in MEMS (Micro-Electrical Mechanical System) structures and NFES technique. MEMS structure with pyramidal cross-section and hexagonal shapes is used to deposit nanofibers in micron meter range.