A5064928088- Mesoporous Materials and Catalysis
- Surface Modification and Superhydrophobicity
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Diamond and Carbon-based Materials Research
- Metal-Organic Frameworks: Synthesis and Applications
- biodegradable polymer synthesis and properties
- Catalytic Processes in Materials Science
- Advanced materials and composites
- Advanced Cellulose Research Studies
- Catalysis for Biomass Conversion
- Advanced ceramic materials synthesis
- Catalysis and Hydrodesulfurization Studies
- Plasma Applications and Diagnostics
- Natural Fiber Reinforced Composites
- Polyoxometalates: Synthesis and Applications
- Tribology and Wear Analysis
- Supercapacitor Materials and Fabrication
- Advanced Sensor and Energy Harvesting Materials
- Aluminum Alloys Composites Properties
- Catalysts for Methane Reforming
- Polymer crystallization and properties
- Catalysis and Oxidation Reactions
- Covalent Organic Framework Applications
- Polymer Nanocomposite Synthesis and Irradiation
Institute of Materials and Environmental Chemistry
2015-2024
HUN-REN Research Centre for Natural Sciences
2015-2024
Research Network (United States)
2022-2023
Hungarian Academy of Sciences
2005-2019
Budapest University of Technology and Economics
2005-2009
Abstract Amorphous calcium carbonate (ACC) is a precursor of crystalline carbonates that plays key role in biomineralization and polymorph evolution. Here, we show several bacterial strains isolated from Hungarian cave produce ACC their extracellular polymeric substance (EPS) shields crystallization. The findings demonstrate bacteria-produced forms water-rich environment at room temperature stable for least half year, which contrast to laboratory-produced needs be stored desiccator kept...
The manufacturing process has been drastically influenced by the advent of three-dimensional (3D) printing as it enables complicated structures to be designed using customized features that traditional processing methods cannot handle. Simultaneously, graphene is increasingly being considered a reinforcement material used for metals and polymers because its exceptional properties. Although several studies have examined additively manufactured graphene/polymer composite parts' mechanical...
A study is presented on cold plasma treatment of the surfaces two engineering polymers, polyamide 6 (PA6) and polyoxymethylene (POM-C), by diffuse coplanar surface barrier discharges under atmospheric air conditions. We found that improved adhesion both polymers for either polymer/polymer or polymer/steel joints. However, was selective investigated adhesive agents were dissimilar studied polymers. In addition, improvement significantly higher PA6 as compared to POM-C. The observed variation...
Surface treatments are commonly employed on woven fabrics to render properties such as dyeability, antibacterial feature, self-cleaning, etc. A variety of environmentally benign cold plasma present a viable alternative the conventional wet chemical processes. The various designs, however, may differ in efficiency and effect they exert fabrics. In this work polyester fabric was treated by diffuse co-planar surface barrier discharges atmospheric air for lengths time. X-ray photoelectron...
Copper manganese oxides (CMO) with CuMn2O4 composition are well-known catalysts, which widely used for the oxidative removal of dangerous chemicals, e.g., enhancing CO to CO2 conversion. Their catalytic activity is highest, close those pre-crystalline and amorphous states. Here we show an easy way prepare a stable CMO material at borderline crystalline state (BAC-CMO) low temperatures (<100 °C) followed annealing 300 °C point out its excellent in oxidation reactions. We demonstrate that...
Abstract Cellulose acetate was modified with caprolactone in an internal mixer at temperatures between 120 and 220 °C, reaction times 5 45 min the presence of tinoctoate catalyst. The effect plasticization on properties polymer studied by dynamic mechanical analysis tensile testing. spectrum cellulose exhibits three main relaxation transitions. These can be assigned to segments (α), smaller structural units chain, probably individual glucose rings (β), hydroxyl or hydroxylmethyl groups (γ)....
We reported on the synthesis of nanosized hydroxyapatite particles by wet chemical precipitation method and consolidation nanoparticles spark plasma sintering. studied effect temperature particle size phase composition obtained HAp. During beyond HAp, another supposedly nonstoichiometric HAp was also formed as a by-product that can be detected thermal analysis combined with XRD. Its amount gradually decreased increase in practically disappeared at 80 °C. Using this nanopowder for sintering,...
The surfaces of two engineering polymers including polyamide 66 (PA66) and polytetrafluoroethylene (PTFE) were treated by diffuse coplanar surface barrier discharges in atmospheric air. We found that plasma treatment improved the adhesion PA66 for either polymer/polymer or polymer/steel joints, however, it was selective investigated adhesive agents. For PTFE unaltered regardless type used adhesive. Tribological properties slightly PA66, too. Both friction coefficient wear decreased....
Among microporous storage materials copper benzene-1,3,5-tricarboxylate (CuBTC MOF, Cu3(BTC)2 or HKUST-1) holds the greatest potential for clean energy gases. However, its usefulness is challenged by water vapor, either in gas to be stored environment. To determine protection of graphene oxide (GO) HKUST-1@GO composites containing 0–25% GO were synthesized and studied. In highest concentration, was found strongly affect HKUST-1 crystal growth solvothermal conditions increasing pH reaction...
Pd loaded alkaline hydrotalcite catalyst proved to be efficient for continuous processing of ABE (acetone–butanol–ethanol) mixture obtainable from biomass degradation fuel precursor components (longer chain length ketones).
Abstract Detailed vibrational (IR, Raman, far-IR) and thermal (TGA, TG–MS, DSC) analysis has been performed on di[κ 1 O,κ 2 O-carbonatotetraamminecobalt(III)] sulfate trihydrate, ([Co(NH 3 ) 4 CO ] SO ·3H O ( ). Its isothermic heating at 100 °C leads to formation of [Co(NH (compound UV IR studies showed that the distorted octahedral arrangement around cis-O CoN core in compound does not change during dehydration, which explains reversible water loss ability rehydrate into . Compound...
Two monoclinic polymorphs of [Ag(NH3)2]MnO4 containing a unique coordination mode permanganate ions were prepared, and the high-temperature polymorph was used as precursor to synthesize pure AgMnO2. The hydrogen bonds between atoms ammonia detected by IR spectroscopy single-crystal X-ray diffraction. Under thermal decomposition, these induced solid-phase quasi-intramolecular redox reaction [Ag(NH3)2]+ cation MnO4– anion even before losing ligand or oxygen atom. decomposed into finely...
Abstract Mulitlayer graphene reinforced silicon nitride composites were prepared by spark plasma sintering to investigate the effect of addition on mechanical properties. The contained multilayer (MLG) in various (0, 1, 3 and 5 wt%) content. Significantly higher fracture toughness 8.0 MPa m 1/2 was obtained at 1% MLG content, however, further increasing content did not increase, but dropped value monolithic nitride. maximum hardness 18.8 also MLG, while contents it gradually decreased.