Synthesis and Characterization of Mesoporous Silicate Films in Supercritical Carbon Dioxide through the Replication of Block Copolymer Templates(Abstract)

摘要

Ordered mesoporous metal oxide films are of enormous interest due to their potential applications in separations, microfluidics, sensing and detection arrays, catalysis, and microelectronics. We have synthesized micron-thick highly-ordered mesostructured silica films by selective condensation of silicon alkoxides within the hydrophilic phase domain of poly(ethylene oxide-block-propylene oxide-block- ethylene oxide), PEO-b-PPO-b-PEO, triblock copolymer dilated with supercritical carbon dioxide. Subsequent calcination of this polymer-silica nanocomposite yields an ordered mesoporous material with a high surface area and regular pore order. First, we will discuss several strategies to reduce the structural contraction in these films, which is desirable for several applications.