Fig. 5
From: Thermally-drawn fibers with spatially-selective porous domains
Porous microsphere production with controlled capillary breakup of porous core fibers. (a) General illustration of the capillary breakup process. Fibers are reheated above the phase transition temperatures of the solution and glass transition of the cladding. The core then evolves into a row of spheres under the effect of surface tension. Once breakup is completed samples are rapidly quenched. (b, c) SEM image and close-up of a polycaprolactone (PCL) porous microsphere and of (d, e) a polyvinylidene fluoride porous microsphere
