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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. ; Sen, S. ; Mera, G. ; Ionescu, E. ; Riedel, R. ; 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), pp. 6221-6228. ACS, ISSN 0897-4756,
[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. ; Sen, S. ; Mera, G. ; Ionescu, E. ; Riedel, R. ; 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
Journal 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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