Hierarchical silica particles by dynamic multicomponent assembly

Z. W. Wu, Q. Y. Hu, J. B. Pang, H. P. Jakobsen, Donghong Yu, Y. F. Lu

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Abstract: Aerosol-assisted assembly of mesoporous silica particles with hierarchically controllable pore structure has been prepared using cetyltrimethylammonium bromide (CTAB) and poly(propylene oxide) (PPO, H[OCH(CH3)CH2],OH) as co-templates. Addition of the hydrophobic PPO significantly influences the delicate hydrophilic-hydrophobic balance in the well-studied CTAB-silicate co-assembling system, resulting in various mesostructures (such as hexagonal, lamellar, and hierarchical structure). The co-assembly of CTAB, silicate clusters, and a low-molecular-weight PPO (average M-n 425) results in a uniform lamellar structure, while the use of a high-molecular-weight PPO (average M-n 2000), which is more hydrophobic, leads to the formation of hierarchical pore structure that contains meso-meso or meso-macro pore structure. The role of PPO additives on the mesostructure evolution in the CTAB-silicate assembling system was discussed. The mesostructure of these particles was characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), and N-2 sorption. (c) 2005 Elsevier Inc. All rights reserved.
Original languageEnglish
JournalMicroporous and Mesoporous Materials
Issue number3
Pages (from-to)305-312
Number of pages13
Publication statusPublished - 2005

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    Wu, Z. W., Hu, Q. Y., Pang, J. B., Jakobsen, H. P., Yu, D., & Lu, Y. F. (2005). Hierarchical silica particles by dynamic multicomponent assembly. Microporous and Mesoporous Materials, 85(3), 305-312.