A facile dual templating route to fabricate hierarchically mesostructured materials
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Hierarchically mesostructured materials have been successfully synthesized via a facile route using amphiphilic block copolymer polystyrene-b-poly (acrylic acid) (PS-b-PAA) and cetyl trimethyl ammonium bromide (CTAB) as dual templates. It is found that the dimension of spherical micelle-like aggregates of PS-b-PAA could be adjusted by changing the kind of solvents. With N,N-dimethylformamide (DMF) as solvent, spherical micelle-like aggregates with an average diameter of 35 nm were obtained, and bimodal mesoporous materials (BMM) possessing large pores of ~35 nm and small pores of 2.5 nm could be prepared. As the solvent was changed to N,N-dimethylformamide (DMF)/tetrahydrofuran (THF) (v/v = 1:1), the average diameter of the spherical micelle-like aggregates of PS-b-PAA was increased to 200 nm, and hollow mesoporous spheres (HMS) with 200-nm hollow cores and 25-nm shells were thus achieved.
KeywordsAcrylic Acid Atomic Transfer Radical Polymerization Atomic Transfer Radical Polymerization Cetyl Trimethyl Ammonium Bromide Cetyl Trimethyl Ammonium Bromide
This work was financially supported by the National Hi-Tech Project of China (Grant No. 2007AA03Z317); the National Natural Science Foundation of China (Grant No. 20633090) and Shanghai Natural Science Foundation (Grant No. 07ZR14028).