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Publication Citation: Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates

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Author(s): Vijay Tirumala; R A. Pai; Sumit Agarwal; Curran Chandler; Gaurav Bhatnagar; Alvin Omang; Eric K. Lin; J J. Watkins;
Title: Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates
Published: October 24, 2007
Abstract: Well ordered mesoporous silica films were prepared by infusion and selective condensation of Si alkoxides within pre-organized block copolymer/homopolymer blend templates using supercritical CO2 as the delivery medium. The morphologies of mesoporous silica films reflect improvements in the long range order of poly (ethylene oxide-b-propylene oxide-b-ethylene oxide) triblock copolymer film templates imparted by blending with selectively associating homopolymers such as poly (acrylic acid) or poly (4- hydroxystyrene) prior to alkoxide infusion. Control over film porosity, pore ordering, and morphology of mesoporous silica films is achieved through simple variations in the homopolymer concentration. The films were characterized using x-ray reflectivity, small angle x-ray scattering and transmission electron microscopy.
Citation: Chemistry of Materials
Volume: 19
Issue: 24
Pages: pp. 5868 - 5874
Keywords: block copolymers;homopolymers;long-range order;mesoporous silica;nanotechnology;supercritical carbon dioxide
Research Areas: Materials Science
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