A5010979638- Graphene research and applications
- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- Aerogels and thermal insulation
- Mesoporous Materials and Catalysis
- Diamond and Carbon-based Materials Research
- Surface Modification and Superhydrophobicity
- Fiber-reinforced polymer composites
- Boron and Carbon Nanomaterials Research
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Carbon Nanotubes in Composites
- Advanced Battery Materials and Technologies
- Zeolite Catalysis and Synthesis
- Copper-based nanomaterials and applications
- Electrochemical sensors and biosensors
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Polymer crystallization and properties
- Thermochemical Biomass Conversion Processes
- Quantum Dots Synthesis And Properties
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- Advanced Battery Technologies Research
Schweißtechnische Lehr- und Versuchsanstalt
2023
Schunk (Germany)
2023
Justus-Liebig-Universität Gießen
2014-2021
We study the transformation from molecular to crystalline of (non-)graphitic carbons synthesized organic precursors by heat-treatment. Easy assessment structural properties resulting heat-treatment protocols is mandatory for industrial process monitoring. demonstrate that Raman spectroscopy, in particular, lineshape analysis G and D mode, offers quick average sheet size such carbons. validate this method performing Raman, WAXS EPR measurements series resin pitch-based synthesized. The...
The preparation of carbons for technical applications is typically based on a treatment precursor, which transformed into the carbon phase with desired structural properties. During such material passes through several different stages, example, starting from precursor molecules via an amorphous crystalline-like phases. While structure non-graphitic and graphitic has been well studied, transformation stages molecular to are still not fully understood. Disordered often contains mixture sp3-,...
In this paper, the preparation of nitrogen-doped carbon fibers and thin films from mixtures polyacrylonitrile (PAN) a poly(ionic liquid) (PIL) by electrospinning dip-coating is presented, respectively, followed carbonization at distinct temperatures. The poor processability PIL into sub-micrometer electrospinning—originating its high charge density meanwhile low glass transition temperature—is successfully circumvented using blends PAN PIL. electrospun fiber mats exhibit...
Polymer-based silicon carbide-derived carbons (Si-CDCs) synthesized at temperatures from 600 to 1500 °C using different templating methods were characterized by wide-angle x-ray scattering (WAXS), Raman spectroscopy, and transmission electron microscopy (TEM). A recently developed advanced algorithm for fitting the whole WAXS data curve of non-graphitic carbons, that is, with a polyaromatic sp2 structure, revealed fine details about CDC microstructure on level graphene layers. In particular,...
Abstract The analysis of the wide‐angle X‐ray scattering (WAXS) data non‐graphitic carbons is challenging due to broad and overlapped ( hk )‐ (00 l )‐reflections. A recently developed advanced method by Ruland Smarsly allows for fitting WAXS a continuous model function, providing detailed insight into sp 2 ‐carbon microstructure. Obtaining parameters like graphene layer extent L , average stack height c disorder effects permits quantification microstructural features. Firstly, this...
Lithium titanate Li4Ti5O12 (LTO) is regarded as a promising alternative to carbon-based anodes in lithium-ion batteries. Despite its stable structural framework, LTO exhibits disadvantages, such the sluggish diffusion and poor electronic conductivity. To modify performance of an anode material, nanosizing constitutes approach impact studied here by systematical experimental approach. Phase-pure polycrystalline nanoparticles (NPs) with high crystallinity crystallite sizes ranging from 4 12 nm...
In the present study, pore space of a mesoporous cerium oxide material is investigated, which forms by self-assembly primary particles into spherical secondary structure possessing disordered mesopore space. The under study exhibits quite stable mesoporosity upon aging at high temperatures (800 °C) and is, thus, potential interest in high-temperature catalysis. Here, different characterization techniques were applied to elucidate structural evolution taking place between heat treatment 400...
Non-graphitic carbons (NGCs) represent the most abundant class of sp2-hybridized carbon, materials (coal char coal, activated etc.). These consist small graphene layer stacks possessing significant structural disorder in both single sheets and stacking. In this study an advanced evaluation approach for wide-angle neutron scattering (WANS) was developed, based on method introduced by Ruland Smarsly 2002. particular, we elucidated if how enhanced WANS data quality larger values modulus vector...
The formation of CeO2 colloidal particles upon heating an aqueous solution (NH4)2Ce(NO3)6 to 100 °C was investigated by time-resolved in situ SAXS analysis using synchrotron radiation, providing absolute intensity data. In particular, the experiments were performed applying different temperatures between room temperature and as well under variation ionic strength concentration. Using validated evaluation tools (SASfit McSAS software), analyses revealed presence two types particle populations...
Non-graphitic carbons (NGCs), such as glass-like carbons, pitch cokes, and activated carbon consist of small graphene layer building stacks arranged in a turbostratic order. Both structure features, including the single sheets well stacks, possess structural disorder, which can be determined using wide-angle X-ray or neutron scattering (WAXS/WANS). Even if WANS data NGCs have already been extensively reported evaluated different studies, there are still open questions with regard to their...
Abstract Carbon aerogels find application in many fields. In most of the applications, they are used as powders and thus need to be pulverized. However, pulverization could induce various changes microstructure carbon aerogels. The extent depends not only on dominant forces technique, but also mechanical structural properties initial monolithic samples. present work, we discuss influence grinding, milling shaker cryo-mill, planetary ball mill stiff, ductile flexible Scanning electron...
This study is dedicated to link the nanoscale pore space of carbon materials, prepared by hard-templating meso-macroporous SiO 2 monoliths, corresponding polyaromatic microstructure using two different precursors wthat generally exhibit markedly carbonization properties, i.e., a graphitizable pitch and non-graphitizable resin. The micro- mesoporosity these monolithic materials was studied sorption behavior relatively large organic molecule ( p -xylene) in comparison typical gas adsorbates...
Front Cover: Electrospinning and carbonization of poly(ionic liquids) (PILs) into fiber mats is demonstrated to produce carbonaceous with high electric conductivity. Systematic analysis provides insight the structural development, shows that electrical conductivity disordered nitrogen-enriched carbon influenced by complex interplay atomic microstructure, amount nature nitrogen dopant, overall chemical composition. Further details can be found in article M. Einert, C. Wessel, F. Badaczewski,...
This study is dedicated to link the nanoscaled pore space of carbons, prepared by hard-templating meso-macroporous SiO 2 monoliths, corresponding polyaromatic microstructure. Two different carbon precursors were used, which generally exhibit markedly carbonization properties, i.e. a graphitizable pitch and non-graphitizable resin. The micro- mesoporosity these monolithic carbons was studied sorption behaviour relatively large organic molecule (para-xylene) in comparison typical gas...