Coaxial Cojetting Electrospinning Method

Because they have heterogeneous components and anisotropic properties, Janus fibers have wide applications in many fields. As a typical technique, side-by-side electrospinning has been proven to be a facile and cost effective method for preparing Janus fibers. But this method can be used only for fabricating dual-paratactic fibers. Based on this, Joerg Lahann et al. reported a coaxial cojetting electrospinning method with dual core flows and triple core flows. Using this method followed by crosslinking, microsectioning, and shell removal, Janus microcylinders and triple paratactic microcylinders composed of different polymers were prepared (Fig. 5.19A). Fig. 5.19B shows the cross-sectional CLSM images of triple coreeshell fibers. Blue, green, and red channels represent poly(vinyl cinnamate)(PVCi), PEO, and PMMA, respectively. Uniquely shaped building blocks can be fabricated by photopatterning of one hemisphere of the microcylinders. This approach can result in Janus coreeshell fibers and triple coreeshell fibers, where the core is defined by the parallel center jets. In all experiments, a PLGA solution was used as the shell stream, which governs the jetting performance and acts as a