Objective
The project is aimed at developing novel wideband Electromagnetic Wave Absorbing materials (EMAM) based on Carbon Onions and their composites. Our preliminary promising results on optical limiting properties of onion like carbon (OLC) material as well as observation of specific electronic properties of these materials (hoping conductivity, high concentration of localized electrons and defects) and detection of the high-level transmission losses in the microwave range suggest that, if properly designed, the OLC-based composites will provide ultra-wide band electromagnetic (EM) absorbing coatings. In combination with scalable technology, which hopefully will make it possible to apply the OLC-based EMAM over large free-standing surfaces, the coatings will allow for a significant reduction of threats to security of civil transportation and communications facilities. To achieve the main goal outlined, the following key tasks will be addressed: 1) Development of the OLC synthesis technology with desirable electrical properties; 2) Development of polymer-based coatings with embedded OLCs; 3) Investigation of EM response properties of developed coatings and methods of their control; 4) Elaboration of a general concept of nanocarbon-based wide-band EMAMs. Nanodiamonds (ND) associates of variable sizes will be used as precursors for OLC production. The variation of ND annealing temperatures provides formation of OLC associates with different number of defects and localized electrons. No other carbon materials present that property while keeping the size of primary structural units. The OLC will be used as building blocks for the design of absorbing coatings with different constitutive parameters. The coatings will be fabricated by thermal spray of ND and OLC with polymer powders and/or by spin-on technique using slurries of carbon onions. All starting materials and final coatings will be carefully characterized (BIC, NIIC, MFA) with physical methods (HR TEM, AFM, EELS, RAMAN sp., XPS, UV/VIS, TPD, DTA). Constitutive parameters of OLC based materials will be measured in the visible, IR and at cm and mm wavelengths. It will provide data on electronic structure (X-ray spectroscopy), temperature dependence of electroresistivity and magnetoresistivity of graphite/diamond nanocomposites and OLC. From there, the general mechanisms of interaction of EM wideband radiations with OLC-based composites will be elucidated. This task comprises complementary works of theoretical modeling (INP, NIIC, LPS) and measurement (INP, NIIC, BIC, UJO) groups with the EMAMs fabricated. The starting point of the theoretical analysis is the determination of the OLC polarizability, which is planned to be carried out by means of rigorous quantum-chemistry simulation for a few concrete models. Effective medium theory will be applied to characterize the dielectric permittivity of the OLC-based composites. Finally it may provide a general concept of nanocarbon-based wide-band EMAMs.
Fields of science (EuroSciVoc)
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Keywords
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
NAMUR
Belgium
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