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题名: Synthesis and characterization of phosphonic acid functionalized organosilicas with bimodal nanostructure
作者: Yang, QH;  Yang, J;  Liu, J;  Li, Y;  Li, C
刊名: CHEMISTRY OF MATERIALS
发表日期: 2005-05-31
DOI: 10.1021/cm050198s
卷: 17, 期:11, 页:3019-3024
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: We report on the synthesis of phosphonic acid functionalized mesoporous organosilicas (MES-PA) with bimodal nanostructure by a postsynthesis treatment method. Phosphonate ester functionalized mesoporous organosilicas (MES-P) were first synthesized by one-step cocondensation of 1,2-bis(trimethoxysilyl)ethane (BTME) and diethoxyphosphorylethyltriethoxysilane (PETES) using triblock copolymer Pluronic P123 as the structure-directing agent in acidic medium. MES-PA were prepared by refluxing the as-synthesized MES-P in concentrated HCl. Further condensation of silicon species during the postsynthesis treatment results in material with more ordered mesostructure compared with the untreated one. Bimodal nanostructure is formed by refluxing MES-P (synthesized with PETES/(PETES + BTME) = 30 mol %) in concentrated HCl. The existence of the bimodal mesopore was confirmed by N-2 sorption isotherms and TEM images. The primary pore structure with pore diameter of 6.5 nm is long-range ordered. The secondary pore structure formed by further condensation of the nanostructured aggregates is disordered with pore diameter centered at 65 nm. The generation of phosphonic acid functionalities, the removal of surfactant, and the formation of secondary pore were accomplished at a single step.
关键词[WOS]: PERIODIC MESOPOROUS ORGANOSILICAS ;  MOLECULAR-SCALE PERIODICITY ;  PORE-SIZE DISTRIBUTION ;  CAGE-LIKE PORES ;  BRIDGING GROUPS ;  ORGANIC GROUPS ;  CHANNEL WALLS ;  COPOLYMER ;  TRIBLOCK ;  SILICA
语种: 英语
WOS记录号: WOS:000229656000032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139652
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yang, QH,Yang, J,Liu, J,et al. Synthesis and characterization of phosphonic acid functionalized organosilicas with bimodal nanostructure[J]. CHEMISTRY OF MATERIALS,2005,17(11):3019-3024.
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