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29Si and13C Solid-State NMR Spectroscopic Study of Nanometer-Scale Structure and Mass Fractal Characteristics of Amorphous Polymer Derived Silicon Oxycarbide Ceramics

Widgeon, S. J. and Sen, S. and Mera, G. and Ionescu, E. and Riedel, R. and Navrotsky, A. (2010):
29Si and13C Solid-State NMR Spectroscopic Study of Nanometer-Scale Structure and Mass Fractal Characteristics of Amorphous Polymer Derived Silicon Oxycarbide Ceramics.
In: Chemistry of Materials, 22 (23), ACS, pp. 6221-6228, ISSN 0897-4756,
[Online-Edition: http://dx.doi.org/10.1021/cm1021432],
[Article]

Abstract

Polymer derived silicon oxycarbide ceramics (SiOC-PDCs) with widely different carbon contents have been synthesized, and their structures have been studied at different length scales using high-resolution 13C and 29Si magic-angle-spinning (MAS) NMR spectroscopic techniques. The data suggest that the structure of these PDCs consists of a continuous mass fractal backbone of corner-shared SiCxO4-x tetrahedral units with “voids” occupied by sp2-hybridized graphitic carbon. The oxygen-rich SiCxO4-x units are located at the interior of this backbone with a mass fractal dimension of 2.5 while the carbon-rich units display a slightly lower dimensionality and occupy the interface between the backbone and the free carbon nanodomains.

Item Type: Article
Erschienen: 2010
Creators: Widgeon, S. J. and Sen, S. and Mera, G. and Ionescu, E. and Riedel, R. and Navrotsky, A.
Title: 29Si and13C Solid-State NMR Spectroscopic Study of Nanometer-Scale Structure and Mass Fractal Characteristics of Amorphous Polymer Derived Silicon Oxycarbide Ceramics
Language: English
Abstract:

Polymer derived silicon oxycarbide ceramics (SiOC-PDCs) with widely different carbon contents have been synthesized, and their structures have been studied at different length scales using high-resolution 13C and 29Si magic-angle-spinning (MAS) NMR spectroscopic techniques. The data suggest that the structure of these PDCs consists of a continuous mass fractal backbone of corner-shared SiCxO4-x tetrahedral units with “voids” occupied by sp2-hybridized graphitic carbon. The oxygen-rich SiCxO4-x units are located at the interior of this backbone with a mass fractal dimension of 2.5 while the carbon-rich units display a slightly lower dimensionality and occupy the interface between the backbone and the free carbon nanodomains.

Journal or Publication Title: Chemistry of Materials
Volume: 22
Number: 23
Publisher: ACS
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 05 Apr 2012 08:53
Official URL: http://dx.doi.org/10.1021/cm1021432
Identification Number: doi:10.1021/cm1021432
Funders: This study was performed within Materials World Network collaborative project “Nanostructure and thermodynamics of polymer-derived ceramics” and was supported by NSF Grant MWN-0907792., Financial support by the Fonds der Chemischen Industrie, Frankfurt (Germany)
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