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The detachable tri-layer concentric spinneret: (a) The design details of the spinneret with three inlets for the three working fluids and a common tri-layer concentric outlet; (b) a digital picture of the full view of the spinneret; (c) a digital image of the tri-layer concentric outlet. (d) A sharp needle with a highly elastic silica tubing for transferring the outer solvent, which has an outer diameter and a wall thickness of 0.3 and 0.05 mm, respectively.
