Fig. 5.

Combined radial and azimuthal control over a particle’s internal architecture. (A) A double-Janus particle: a core and shell each consisting of two halves of different materials. Here, the two symmetry-breaking axes are orthogonal. From Left to Right: A schematic of the fiber structure, SEM micrograph of the fiber cross-section, and energy-dispersive X-ray spectroscopy micrographs identifying the elements S, As, and Se. (B) Same as A, except the cross-sections are midplane through a particle resulting from the breakup of the fiber in A. (C and D) Same as A and B, except the symmetry-breaking axes in the core and shell are parallel. G₁, As₂S₃; G₂, Ge_1.3(As₂Se₃)_98.7; P₁, PES; P₂, PEI.