Mesoporous Zirconium Phenylenesiliconate‐phosphonate Hybrids with Ordered Lamellar Nanostructures |
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| Authors: | Prof?Dr Kazuyuki Maeda Hiroki Kobayashi Kaku Oguro Masato Otsu Dr Atsushi Kondo Dr Tei Maki |
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| Institution: | 1. Department of Applied Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184‐8588 (Japan);2. Research Center for Science and Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184‐8588 (Japan);3. EM Application Department, EM Business Unit, JEOL Ltd., Akishima, Tokyo 196‐8558 (Japan) |
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| Abstract: | Novel ordered lamellar mesostructure pZrPS‐2 was hydrothermally prepared by using zirconium propoxide and 4‐(EtO)2OPC6H4Si(OEt)3 (pPPS‐E), which was hydrolyzed to organic building units substituted with both siliconate and phosphonate groups, in the presence of CnTAB and TMAOH. The pZrPS‐2 materials were obtained at a Zr/PPS ratio of 2 or higher and the basal spacing was increased by using a longer‐chain surfactant (n=12–18). Removal of the occluded surfactants at 300 °C resulted in retention of the lamellar structure with negligible shrinkage of the interlayer distance. Nitrogen adsorption studies revealed the ordered mesoporous nature of pZrPS‐2 with a pore diameter of approximately 2 to 3 nm. The lamellar structure is assumed to be composed of layers that include zirconia‐based crystalline nanodomains and interlayer pillars mainly based on PPS units. Although lamellar structures with the same crystalline phase also formed when no surfactant was added or when the meta isomer of PPS was used, no mesoporous materials were obtained except pZrPS‐2. A possible schematic model to elucidate these results is also proposed. |
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| Keywords: | lamellar mesostructures mesoporous materials metal phosphonates organic– inorganic hybrid composites organosilicas |
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