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论文类型：期刊论文

发表时间：2010-05-10

发表刊物：ADVANCED FUNCTIONAL MATERIALS

收录刊物：SCIE、EI

卷号：20

期号：9

页面范围：1473-1479

ISSN号：1616-301X

摘要：Monolithic 3D porous silica structures are fabricated into a multilayer framework with a bimodal pore size distribution in the micrometer and sub-micrometer range. The fabrication-which involves directed assembly of colloidal spheres, transfer, printing, and removal of a sacrifical template-yields robust and mechanically stable structures over a large area. The structure becomes monolithic upon pyrolyzing the stacked layer, which induces necking of the particles. The monolithic microstructues can easily be embedded in microchannels with the aid of photolithography, leading to the formation of a microfluidic system with a built-in microstructure in a site- and shape-controlled manner. Utilization of the system results in a fourfold increase in the mixing efficiency in the microchannel.