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Advanced Low Dimensional Nanocarbon Based Silica Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Carbon Materials".

Deadline for manuscript submissions: closed (15 July 2021) | Viewed by 3600

Special Issue Editor


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Guest Editor
Materials and Earth Science Department, TU Darmstadt, D-64287 Darmstadt, Germany
Interests: ceramics and ceramic nanocomposites; multifunctional nanomaterials; low-dimensional nanocarbon-based materials; polymer-derived ceramics, sol-gel science; polymer and organometallic chemistry
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Special Issue Information

Dear Colleagues,

Protection of the environment by increasing energy efficiency as well as by developing new clean energy sources is one of the most important global challenges of our days. In order to fulfill all requirements for new technologies relevant to energy security, innovative “smart” composite materials with synergetic functions of their components are needed. Low-dimensional nanocarbons are major building blocks for ceramic hybrid materials and nanocomposites. They can be incorporated in matrix materials using a green engineering technology, an issue which is important for a sustainable energy and environment advancement. Nanocarbons refer to nanostructured carbon materials, which include pure carbon materials with at least one dimension in the nanoscale (i.e., <100 nm), such as nanofibers, nanodiamonds, nanohorns, nano-onions, and ordered mesoporous carbon materials as well as fullerenes, carbon nanotubes (CNTs), and graphene. For the synthesis of nanocarbon–silica hybrids and composites, a wide variety of chemical reactions and processing techniques such as solid-state reactions, sol–gel synthesis, polymer-derived ceramics route, sintering, and deposition techniques can be applied. Low-dimensional nanocarbon-containing composites have found applications in a large range of domains, from vehicle/aircraft technology, health and safety, energy storage and conversion, air/water pollution control up to airspace applications, etc.

The scope of this Special Issue includes, without being limited to, the following topics:

- Synthesis Methods: gas-phase techniques (e.g., CVD, ALD); liquid-phase methods (sol–gel, solvothermal, etc.); and solid-state procedures (different sintering techniques, polymer-derived ceramics; mechanical alloying, etc.);

- Properties: electronic; optical; magnetic; catalytic, high temperature resistance to crystallization and decomposition; mechanical; charge carriers transport; thermal transport; etc.;

- Micro-/nanostructure;

- Applications: electronic applications; high-temperature structural applications; catalysis; energy conversion and storage, lightning, coatings, etc.

It is our pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews that cover all aspects (i.e., synthesis–structure–property relationships, applications and future directions) of nanocarbon–silica composites are all welcome.

You can find the instructions for authors at:

https://www.mdpi.com/journal/materials/instructions#top

The official deadline for submission is 31 December 2020. You may send your manuscript either now or by the deadline. Your submission should not have been previously published, nor be under consideration for publication elsewhere.

Thank you very much for your consideration. We will be happy to receive a contribution from you, and we look forward to hearing from you soon.

Dr. Gabriela Mera
Guest Editor

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • Low-dimensional nanocarbon–silica hybrid materials and nanocomposites
  • Synthesis strategies for nanocarbon–silica composites
  • Metal-catalyst-free synthesis of nanocarbon–silica composite
  • Processing techniques
  • Characterization methods for nanocarbon–silica composites
  • Structural properties of nanocarbon–silica composites
  • Functional properties of nanocarbon–silica composites
  • Applications of nanocarbon–silica composites

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Published Papers (1 paper)

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Research

23 pages, 6821 KiB  
Article
Structure and Thermodynamics of Silicon Oxycarbide Polymer-Derived Ceramics with and without Mixed-Bonding
by Casey Sugie, Alexandra Navrotsky, Stefan Lauterbach, Hans-Joachim Kleebe and Gabriela Mera
Materials 2021, 14(15), 4075; https://doi.org/10.3390/ma14154075 - 22 Jul 2021
Cited by 10 | Viewed by 3087
Abstract
Silicon oxycarbides synthesized through a conventional polymeric route show characteristic nanodomains that consist of sp2 hybridized carbon, tetrahedrally coordinated SiO4, and tetrahedrally coordinated silicon with carbon substitution for oxygen, called “mixed bonds.” Here we synthesize two preceramic polymers possessing both phenyl [...] Read more.
Silicon oxycarbides synthesized through a conventional polymeric route show characteristic nanodomains that consist of sp2 hybridized carbon, tetrahedrally coordinated SiO4, and tetrahedrally coordinated silicon with carbon substitution for oxygen, called “mixed bonds.” Here we synthesize two preceramic polymers possessing both phenyl substituents as unique organic groups. In one precursor, the phenyl group is directly bonded to silicon, resulting in a SiOC polymer-derived ceramic (PDC) with mixed bonding. In the other precursor, the phenyl group is bonded to the silicon through Si-O-C bridges, which results in a SiOC PDC without mixed bonding. Radial breathing-like mode bands in the Raman spectra reveal that SiOC PDCs contain carbon nanoscrolls with spiral-like rolled-up geometry and open edges at the ends of their structure. Calorimetric measurements of the heat of dissolution in a molten salt solvent show that the SiOC PDCs with mixed bonding have negative enthalpies of formation with respect to crystalline components (silicon carbide, cristobalite, and graphite) and are more thermodynamically stable than those without. The heats of formation from crystalline SiO2, SiC, and C of SiOC PDCs without mixed bonding are close to zero and depend on the pyrolysis temperature. Solid state MAS NMR confirms the presence or absence of mixed bonding and further shows that, without mixed bonding, terminal hydroxyls are bound to some of the Si-O tetrahedra. This study indicates that mixed bonding, along with additional factors, such as the presence of terminal hydroxyl groups, contributes to the thermodynamic stability of SiOC PDCs. Full article
(This article belongs to the Special Issue Advanced Low Dimensional Nanocarbon Based Silica Composites)
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