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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|
|Pages:||pp. 5868 - 5874|
|Keywords:||block copolymers,homopolymers,long-range order,mesoporous silica,nanotechnology,supercritical carbon dioxide|
|Research Areas:||Materials Science|
|PDF version:||Click here to retrieve PDF version of paper (2MB)|