510682.fig.004a
(a)
510682.fig.004b
(b)
Figure 4: Core-shell structured nanofibers produced from (a) coaxial electrospun PEO and poly-dodecyl thiophene (PDT), with PDT forming the core structure [23] and (b) emulsion electrospun poly(ethylene glycol)-poly(L-lactic acid) diblock copolymer (PEG750-PLA) and PEO (the core is visible by labeling PEO with fluorescein isothiocyanate, FITC) [24].