Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates
Vijay Tirumala, R A. Pai, Sumit Agarwal, Curran Chandler, Gaurav Bhatnagar, Alvin Omang, Eric K. Lin, J J. Watkins
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.
, Pai, R.
, Agarwal, S.
, Chandler, C.
, Bhatnagar, G.
, Omang, A.
, Lin, E.
and Watkins, J.
Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates, Chemistry of Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852651
(Accessed December 8, 2023)