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Facile Sol-gel Synthesis of Porous Silicas Using Poly(propylene)imine Dendrimers as Templates

Published online by Cambridge University Press:  31 January 2011

Gustavo Larsen ,
Edgar Lotero  and
Manuel Marquez
Gustavo Larsen*
Affiliation:
Department of Chemical Engineering, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0126
Edgar Lotero
Affiliation:
Department of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304
Manuel Marquez
Affiliation:
Los Alamos National Laboratory, Chemical Science and Technology Division, Los Alamos, New Mexico 87545, and Nanotechnology Laboratory (NanoteK), Research and Development, Kraft Foods Inc., 801 Waukegan Road, Glenview, Illinois 60025
*
a)Address all correspondence to this author.
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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.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1842 - 1848
Copyright
Copyright © Materials Research Society 2000

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