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Received February 4, 2004
Accepted September 10, 2004
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Rapid Synthesis of Mesoporous Silica by an Accelerated Microwave Radiation Method

1Department of Chemical and Biomolecular Engineering, and Center for Energy and Environment Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kuseong-dong, Yuseong-gu, Daejeon 305-701, Korea 2Samsungcorning R&BD Center, 472, Sin-dong, Yeoungtong-gu, Suwon, Gyeonggi-Do 442-732, Korea 3LG Household & Health Care Research Park, #84 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
kjd@kaist.ac.kr
Korean Journal of Chemical Engineering, November 2004, 21(6), 1224-1230(7), 10.1007/BF02719498
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Abstract

Microwave-hydrothermal processes for the synthesis of mesoporous silica were investigated with different pathways and mixture conditions at 373 K, and the corresponding structures to the hydrothermal method were synthesized within a very short crystallization time. 2-D hexagonally ordered arrays of MCM-41 materials via the direct electrostatic assembly pathway of S+I- and mediated templating pathways of S+X-I+ with CTAB were synthesized, and cubic mesophase of MCM-48 was also prepared within 2 hrs of microwave heating without adding alcohol. Nonionic surfactants with ethylene oxide (EO) moiety as structure-directing agents were used for the preparation of ordered array of hexagonal or cubic mesostructured silica via the charge matching principle of (S0H+)(X-I+). Although the detailed roles of microwaves may differ for each process, microwaves accelerate the formation of multiply charged silicate oligomers, initiating mesophase assembly. Therefore, the use of microwave radiation can transfer energy uniformly and quickly, and complete the syntheses of mesostructured materials within a short time.

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