Facile Sol-gel Synthesis of Porous Silicas Using Poly(propylene)imine Dendrimers as Templates
- 1 August 2000
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 15 (8) , 1842-1848
- https://doi.org/10.1557/jmr.2000.0266
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.Keywords
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