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

Gustavo Larsen, Edgar Lotero, Manuel Marquez

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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.

Original languageEnglish (US)
Pages (from-to)1842-1848
Number of pages7
JournalJournal of Materials Research
Volume15
Issue number8
DOIs
StatePublished - Aug 2000

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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