Mesoporous silica monoliths containing arrays of aligned macropores oriented perpendicular to their surfaces were prepared by non-destructive imprinting of sol/gels with polymer nanorod arrays. Crack-free monoliths with areas of up to 2.5 cm2 were obtained by a combination of slow drying under ambient conditions and optimized freeze-drying.
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Grimm et al. (2012) studied this question.
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