Side-by-side Electrospinning Method

In 2015, White and Yu’s group further studied and developed the side-by-side electrospinning method by regulating the angle between the two needles of the spinneret. By varying the angle, the width, interfacial area, and volume of each side would also be changed. Therefore, different Janus nanofibers with adjustable structures were obtained. The diagram of the spinneret is shown in Fig. 5.17A, and the angle marked q could be tuned to change the morphology of the fibers. The solutions in this work were mainly PVP K-60/rhodamine B and Eudragit@L100/8-anilino-1-naphthalenesulfonic acid ammonium salt in a mixture of ethanol and DMAc. For the side-by-side electrospinning, the two solutions were stretched from their own needles with the same electrostatic charge and came together at the outlet of the nozzle. With their mutual electrostatic repulsion, the two solutions may separate from each other, which would lead to a failure to form the side-by-side structure. In this research, however, arranging the angle between the two ports to some suitable value would contribute to the fabrication of the side-by-side structure. The corresponding TEM images for when the values of the angle q were 40, 50,