Contact
Intranet
SK
International
| JoinHEC – Vývoj nových metód spájania vysoko-entropických keramických materiálov | |
| Development of new joining methods for high entropy ceramics | |
| Program: | Bilateral – other |
| Project leader: | Ing. Tatarko Peter, PhD. |
| Annotation: | The main aim of the proposed project is to develop new joining techniques for high entropy ceramics (HEC) in order to improve the operational limits of the joints for aerospace applications. The project proposes an innovative way of manufacturing of HEC joints with potentially improved high temperature properties, using a direct solid-state diffusion bonding (without an interlayer) or diffusion bonding with refractory metal interlayers. For the first time, refractory high entropy alloys (HEA) will be used as the joining interlayers between a pair of HEC, or as the interlayer for joining of HEC to ceramic matrix composites (CMCs). The project aims to generate new fundamental knowledge on the understanding of the effect of electric field and surface preparation on the direct diffusion bonding of HEC, as well as the interfacial physico-chemical phenomena occurring at the HEC/HEA and HEA/CMCs interfaces. The mechanical performance of the joints at room and high temperatures will be investigated to define the operational limits of the joints. The project will provide a comprehensive insight on the joining of high entropy ceramics for potential aerospace applications. This may significantly expand the application potential of the recently developed next generation ultra-high temperature ceramics, i.e. high entropy ceramics. |
| Duration: | 1.7.2022 – 30.6.2025 |
National
| NANOCOMENVIRO – Nový tiolom funkcionalizovaný nanokompozit montmorillonit/biochar pre imobilizáciu ťažkých kovov z kontaminovanej záplavovej pôdy | |
| Novel thiol-functionalized montmorillonite/biochar nanocomposite for immobilization of heavy metals from contaminated floodplain soil | |
| Program: | Plán obnovy EÚ |
| Project leader: | Ing. Slaný Michal, PhD. |
| Annotation: | Soil contamination by heavy metals is currently a global environmental problem due to the potential transfer of these toxic elements to the biosphere and hydrosphere, posing risks to plants, animals, and especially human health. Toxic metals such as Hg, Cd, As, Tl, Pb, Cu, Ni, and Zn are transported through river water in suspended material or in dissolved form and accumulating in floodplains during floods with low flow velocities. However, our understanding of the biogeochemistry of toxic metals in soils, especially under dynamic redox conditions, is very limited. Therefore, detailed knowledge of the redox behaviour of heavy metals in soil is crucial to comprehend mobilization processes and accurately monitor their release into water under changing redox conditions. It is also important to understand the redox mobilization of heavy metals in the soil so that their hazard potential can be better predicted. Therefore, growing need to find novel, environmentally friendly, and cost-effective materials from abundant resources that can immobilize these dangerous substances in floodplain soils. This project offers a novel and innovative solutions for heavy metal immobilization using thiol-functionalized montmorillonite/biochar nanocomposite from floodplain soil under dynamic environmental (redox) conditions. Such a study has not been performed yet and holds great potential to contribute new knowledge and thus lead to significant improvement environmental quality, application of appropriate management, risk assessment of contaminated floodplain soils as well as improving the quality of soil and plants, which is closely related to human health. The proposed objectives of the project focus on new applications and on previously unexplored step change solutions that will answer the most important questions as well as research and technological development needs, including those that are important on a global scale. |
| Duration: | 1.7.2024 – 30.6.2026 |
| BENTONITE – GAP – Bentonit: strategická surovina Slovenska – inovatívne hodnotenie zdrojov a ich kvality pre jej efektívne využívanie | |
| Bentonite: Slovak strategic raw material – Innovative assessment of bentonite quality and origin for its efficient use | |
| Program: | SRDA |
| Project leader: | RNDr. Madejová Jana, DrSc. |
| Annotation: | Bentonite is an important industrial raw material. Due to the high amount of clay minerals from the smectite group, bentonite has unique properties, e.g. high swelling capacity, plasticity, high specific surface area, cation exchange capacity and low hydraulic conductivity. Due to these properties bentonites have broad range of possible applications. Consequently, worldwide bentonite production is constantly increasing. Slovak republic (SR) is one of the world\’s leading bentonite producers and bentonites belong to the strategic raw materials in SR. In the last 10-15 years, several new bentonite deposits have been opened in SR, most of which have never been studied in detail.Which is one of the causes that the potential of Slovak bentonites is not fully utilized. One of the objectives of the project is therefore the comprehensive characterization of bentonites from new deposits. The mineral and chemical composition of bentonites, their physico-chemical, mechanical, and rheological properties will be determined. The obtained results will help to better understand the geology and genesis of bentonite deposits which may lead to thediscovery of other economic accumulations of bentonites. The main contribution of the project lies in the rational, economical, and efficient use of domestic raw materials which will lead to the long-term sustainability of bentonite exploitation in SR. The way in which the proposed changes will be implemented is highly innovative. The main application outputs of the project such as: passports for the optimal utilization of different qualitative types of bentonites, including economic analysis, 3D model of bentonite quality and geological model of selected bentonite deposit, will contribute to achieve this ambitious goal. The multidisciplinary team of experts on domestic and worldbentonites in cooperation with major bentonite producer in SR, REGOS, s.r.o. is guarantee of successful solution ofthe proposed project. |
| Duration: | 1.1.2021 – 30.6.2025 |
| Potenciál vrstevnatých aluminosilikátov ako excelentných nosičov polykatiónov: dizajnovanie nových kompozitných nanomateriálov | |
| Potential of layered aluminosilicates as excellent guests to accommodate polymeric cations: design of new composite materials | |
| Program: | VEGA |
| Project leader: | Ing. Pálková Helena, PhD. |
| Annotation: | The project is aimed at the preparation of composite materials based on layered aluminosilicates as suitablecarriers for different types of organic polycations, possessing properties interesting for various applications. Thevariability in the chemical composition of the selected layered materials in connection with the diversity of themolecular structures and properties of polymeric cations and copolymers opens up wide opportunities towardsthe preparation of well-defined systems. Careful selection of the inorganic carries and polycations is an essentialstep to achieve their mutual compatibility resulting not only in preserving but primarily in improving the keyproperties of the prepared composites. Therefore, the synthesis conditions (e.g. pH) and the addition of anothercomponent to the systems (fluorescent dyes, metal nanoparticles) will be evaluated. The cytotoxicity test topredict biocompatibility of the materials, photoactivity, catalytic and adsorption efficiency will be assessed as well. |
| Duration: | 1.1.2021 – 31.12.2024 |