Suspended self-assembled opal membranes have been prepared from 440- or 170-nm-diameter silica spheres by evaporation of their colloidal solutions over vertically oriented 0.3-mm-thick silicon wafers containing frustum-shaped openings. Robust 0.5 x 0.5 mm(2) membranes with a thickness of ca. 300 mum have been reproducibly prepared using 170 nm silica spheres. The membranes show regular fcc packing with an exposed (111) orientation and are formed in a process that involves drawing silica spheres into the opening with the solvent meniscus.
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Bohaty et al. (2006) studied this question.
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