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Surface morphology of polymer fibers electrospun from (a) a PS/THF solution; (b) a PAN/DMF solution; (c) a PS/DMF solution; and (d) a PS in a mixed solvent of DMF and THF. Inset fibers outlined in white for emphasis.
Dependence of critical wave number on for different . The lines are analytical results of Eq. (2); the symbols are numerical results.
Map of numerical results for wrinkled cross-section as a function of and , shown for each pair of and values indicated by the axis labels.
(a) Dependence of on for different (solid line is the theory solution according to Eq. (3); filled symbols correspond to lowest mode cases where and ). (b) Surface patterns for different radius fibers with the same thickness at and , showing wavelength ( and , respectively) to be independent of fiber radius.
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