Tailoring of pore size in ordered silicas with very large cylindrical and spherical mesopores

INOR 389

Michal Kruk, kruk@mail.csi.cuny.edu1, Liang Cao, Cao@mail.csi.cuny.edu1, and Chin Ming Hui2. (1) Department of Chemistry, College of Staten Island and Graduate Center, City University of New York, Building 6S-241, 2800 Victory Boulevard, Staten Island, NY 10314, (2) Department of Chemistry, College of Staten Island, Building 6S-124, 2800 Victory Boulevard, Staten Island, NY 10314
Large-pore SBA-15 silicas with 2-D hexagonal structure and large-pore FDU-12 (LP-FDU-12) silicas with face-centered cubic structure were synthesized using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers as templates and aliphatic or aromatic hydrocarbons as micelle expanders. It was shown that the diameter of cylindrical pores of large-pore SBA-15 can be tailored in the range from 10 to at least 15 nm by adjusting the time or temperature of the hydrothermal treatment to which the synthesis mixture was subjected. On the other hand, the adjustment of time of such a treatment did not afford any good control of pore diameter in LP-FDU-12, which may be related to the presence of high concentration of inorganic salts in the pertinent synthesis mixture. However, the diameter of spherical mesopores of LP-FDU-12 can be tailored in the range from about 17 to 26 nm by adjusting the time or temperature of post-synthesis treatment in HCl solution.
 

Synthesis and Characterization of Materials
1:30 PM-5:30 PM, Monday, August 20, 2007 BCEC -- 206 A/B, Oral

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007