Mesoporous silica ropes and pillar-within-hollow gyroidal spheres with highly ordered nanostructure have been synthesized through acid and ammonia hydrothermal treatment. Along with hierarchical structures, mesoporous tubules and myelin fingers, such as that shown in the Figure, spontaneously form from the silica ropes or on the shell of the hollow gyroidal spheres.
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Lin et al. (2000) studied this question.