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Facile sol-gel synthesis of porous silicas using poly(propylene)imine dendrimers as templates

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Abstract

Commercially available poly(propylene)imine (DAB-Am-32 and DAB-Am-64) dendrimers were used as single-molecule templates to tailor the porosity of silicas via a nonacidic sol-gel method. X-ray diffraction on both the as-prepared (oven-dried at 373 K) and the calcined (833 K) materials revealed that modest contraction took place on template removal and that the cavities created did not achieve three-dimensional ordering under the current synthesis conditions. Transmission electron microscopy of “Pt-stained” samples supported this picture. A modified Horvath–Kawazoe analysis of the argon adsorption isotherms indicated that DAB-Am-64 is a much more effective template than DAB-Am-32. Pyrolysis and oxidation protocols for template removal are also presented.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Nebraska—Lincoln, Nebraska, 68588-0126, Lincoln, USA

    Gustavo Larsen

  2. Department of Chemistry, University of Nebraska—Lincoln, Nebraska, 68588-0304, Lincoln, USA

    Edgar Lotero

  3. Chemical Science and Technology Division, Los Alamos National Laboratory, New Mexico, 87545, Los Alamos, USA

    Manuel Marquez

  4. Nanotechnology Laboratory (NanoteK), Research and Development, Kraft Foods Inc., Illinois, 801 Waukegan Road, 60025, Glenview, USA

    Manuel Marquez

Authors
  1. Gustavo Larsen
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  2. Edgar Lotero
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  3. Manuel Marquez
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Larsen, G., Lotero, E. & Marquez, M. Facile sol-gel synthesis of porous silicas using poly(propylene)imine dendrimers as templates. Journal of Materials Research 15, 1842–1848 (2000). https://doi.org/10.1557/JMR.2000.0266

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  • DOI: https://doi.org/10.1557/JMR.2000.0266

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