A TEM image of core−shell structured bi-component nanofiber produced by a coaxial electrospinning technique. The core and shell are polymers of gelatin and PCL, respectively. Variation of inner concentration during such a spinning process also resulted in tunable amount of gelatin encapsulated in the PCL-r-gelatin bi-component nanofibers.
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Zhang et al. (2004) studied this question.
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