Peering into the structural evolution of glass-like carbons derived from phenolic resin by combining small-angle neutron scattering with an advanced evaluation method for wide-angle X-ray scattering 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Carbon: An International Journal Sponsored by the American Carbon Society
年/卷/期
2019 / 141 /
页码
169-181
ISSN号
0008-6223
作者单位
Justus Liebig Univ, Inst Phys Chem, Heinrich Buff Ring 17, D-35392 Giessen, Germany;Justus Liebig Univ, Inst Phys Chem, Heinrich Buff Ring 17, D-35392 Giessen, Germany;Justus Liebig Univ, Inst Phys Chem, Heinrich Buff Ring 17, D-35392 Giessen, Germany;Schunk Carbon Technol GmbH, Rodheimer Str 59, D-35452 Heuchelheim, Germany;Helmholtz Zentrum Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany;Helmholtz Zentrum Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany;Univ Appl Sci, Campus Friedberg,Wilhelm Leuschner Str 13, D-61169 Friedberg, Germany;Justus Liebig Univ, Inst Phys Chem, Heinrich Buff Ring 17, D-35392 Giessen, Germany;
作者
Badaczewski, F.;Loeh, M. O.;Pfaff, T.;Dobrotka, S.;Wallacher, D.;Clemens, D.;Metz, J.;Smarsly, B. M.;
摘要
The structural evolution of two non-graphitizing glass-like carbons derived from a liquid resole and a solid novolac-type phenolic resin was quantitatively characterized by combining small-angle neutron scattering (SANS) with an advanced evaluation for wide-angle X-ray scattering (WAXS) data. Utilizing these two methods allowed for studying the microstructure on the Angstrom level (graphene stacks, WAXS) and the inaccessible microporosity (SANS). The applied WAXS analysis provided quantitative structural parameters for both, size and disorder in the polyaromatic sp(2) microstructure. Hence, the combined SANS-WAXS analysis yielded comprehensive insights into the relation between the graphene microstructure and the inaccessible porosity upon heat treatment for glass-like carbons, i.e. a nongraphitizing class of carbon. In particular, the analogue investigation of a graphitizing mesophase pitch demonstrates the major impact of the chemical composition of the utilized carbon precursor. For the glass-like carbons the results revealed different growth rates for the lateral extent of the basic structural units (L-a) depending on the temperature range, finally reaching 12 nm, whereas the stack height (L-c) exhibiting 2.2 nm is hardly affected by the thermal processing up to 3000 degrees C. As a major finding our study thus relates the evolution of microstructure and porosity to changes in chemical composition. (C) 2018 Elsevier Ltd. All rights reserved.
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