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Self-Assembly of Layered Aluminum Silsesquioxanes: Clay-Like Organic-Inorganic Nanocomposites

Published online by Cambridge University Press:  10 February 2011

L. Ukrainczyk ,
R. A. Bellman ,
K. A. Smith  and
J. E. Boyd
L. Ukrainczyk
Affiliation:
Dept. of Agronomy, Iowa State Univ., Ames, IA 50011
R. A. Bellman
Affiliation:
Dept. of Materials Science and Engineering, Iowa State Univ., Ames, IA 50011
K. A. Smith
Affiliation:
Dept. of Chemistry, Univ. of New Mexico, Albuquerque, NM 87131
J. E. Boyd
Affiliation:
Dept. of Chemistry, Univ. of New Mexico, Albuquerque, NM 87131
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Abstract

A series of layered silicate-like structures with a wide range of Si/AI ratios that have an organic functionality directly bonded to the structural Si atom by Si-C bond were prepared by template sol-gel synthesis at room temperature and pressure. XRD patterns indicate that organic functionalities in the interlayers are in paraffin-like arrangement and do not interpenetrate. Structural ordering is primarily governed by the assembly of the organic functionalities into lamellar micelles. Nanocomposites were studied by solid state 29Si and 27AI NMR to determine the degree of condensation of inorganic framework. The results indicate that Si-O-Al linkages do not form in gels precipitated at low pH. Stable Si-O-Al linkages form when pH of the precipitates is raised. The highest degree of Si-O-Al bonding is obtained when Al solutions are prehydrolyzed prior to the addition of silane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 519
Copyright
Copyright © Materials Research Society 1997

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References

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