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(a–c) Images of compound Taylor cones formed in the co-electrospinning of core CA-D solution and shell CA-AD21 solution under the core-to-shell flow ratio of (a) 1:6, (b) 1:1.5 and (c) 1:1, respectively; (d–i) SEM images of resultant nanofibers prepared under core-to-shell flow ratio of (d) 1:6, (e) 1:4.5, (f) 1:3, (g) 1:1.5, (h) 1:1 and (i) 1:0.2, respectively.
