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Many spheres of influence: Surface coating of monodisperse polystyrene (PS) nanosphere seeds with a phenol‐containing polymer (PF) and then silica forms a dual core–shell structure PS@PF@SiO2 (see picture). Subsequent pyrolysis results in discrete, dispersible, and uniform hollow carbon nanospheres (HCSs). The outer silica shell serves as a nanoreactor and thus prevents the polymer and carbon layers...
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