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Facile Fabrication of Monolithic 3D Porous Silica Microstructures and a Microfluidic System Embedded with the Microstructure

Authors

  • ZuoYi Xiao,

    1. State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 (PR China)
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    • ZuoYi Xiao worked at Professor Kim's lab under a co-advisor program.

  • Anjie Wang,

    1. State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 (PR China)
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  • Jayakumar Perumal,

    1. Department of Fine Chemical Engineering and Chemistry Graduate School of Analytical Science and Technology Chungnam National University, Daejeon 305-764 (Korea)
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  • Dong-Pyo Kim

    Corresponding author
    1. Department of Fine Chemical Engineering and Chemistry Graduate School of Analytical Science and Technology Chungnam National University, Daejeon 305-764 (Korea)
    • Department of Fine Chemical Engineering and Chemistry Graduate School of Analytical Science and Technology Chungnam National University, Daejeon 305-764 (Korea).
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Abstract

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 sacrificial template – yields robust and mechanically stable structures over a large area. The structure becomes monolithic upon pyrolyzing the stacked layers, which induces necking of the particles. The monolithic microstructures 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.

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