1. Copper- and lead-based nanoparticles in freshwater sediments : spatiotemporal trends and environmental impactMavro Lučić, Janja Vidmar, Radmila Milačič Ščančar, Janez Ščančar, Bor Arah, Nevenka Mikac, Maja Ivanić, Željka Fiket, Neda Vdović, 2026, izvirni znanstveni članek Ključne besede: metallic nanoparticles, environmental risk assessment, spatiotemporal distribution
Objavljeno v DiRROS: 27.01.2026; Ogledov: 428; Prenosov: 318
 Celotno besedilo (9,19 MB)
Gradivo ima več datotek! Več... |
2. Electrocatalytic trends of different Cantor entropy alloys for alkaline and acidic hydrogen-evolution reactionsBarbara Ljubec Božiček, Bor Arah, Monika Kušter, Iztok Naglič, Boštjan Markoli, Maja Ponikvar-Svet, Lara Einfalt, Miran Čeh, Belisa Alcantara Marinho, 2024, izvirni znanstveni članek Povzetek: Medium- and high-entropy alloys (MEAs and HEAs) are the basis of unique electrocatalysts for hydrogen-evolution reactions (HERs) due to their tunable chemical compositions and microstructures. Here, various Cantor MEAs (CoFeNi, CoFeNiMn, CoFeNiCr) and a HEA (CoFeNiMnCr) made up of affordable non-noble transitional metals with different structures (primary matrix and secondary phases, grain sizes, lattice parameters) were successfully synthesized with an inert-gas melting process. A close correlation was established between their physicochemical properties (elemental composition, microstructure, crystal structure) and the hydrogen-binding ability of the elements in the alloy on the electrocatalytic HER activity and stability in alkaline and acidic media. Advanced performances of electrocatalysts toward HERs were revealed in a specially designed electrochemical cell. Effectively identifying these electrocatalytic trends lays the groundwork for the strategic design of multi-component alloy electrocatalysts for practical HERs.
Ključne besede: water-spliting, hydrogen-binding energy, medium-entropy alloys, high-entropy alloys, spillover effect
Objavljeno v DiRROS: 10.11.2025; Ogledov: 621; Prenosov: 335
Celotno besedilo (4,83 MB)
Gradivo ima več datotek! Več... |
3. The role of carbon presence on the strontium hexaferrite phase decomposition during pressureless spark plasma sintering (pSPS)Aleksander Učakar, Andraž Kocjan, Blaž Belec, Janez Košir, Tanja Kallio, Marjeta Maček, Bor Arah, Petra Jenuš, 2025, izvirni znanstveni članek Povzetek: The phase composition and microstructure of Sr-hexaferrite (SFO) ceramics govern the hard magnetic properties. Here, pressureless spark plasma sintering (pSPS) technique was employed for the rapid consolidation (500°C/min) of SFO in a radiating graphite crucible under vacuum and, thus, reductive conditions. A numerical model depicting the temperature profile within the heating crucible was constructed to understand the temperature evolution within the samples. The combination pSPS sintering environment (graphite heating crucible under vacuum) promoted phase decomposition to Sr-enriched and depleted phases of various morphological variations, leading to reduction of hard magnetic properties. Notably, certain newly formed phases exhibited lower melting points, inducing a shift in the sintering mechanism from solid-state sintering to a partial liquid-phase sintering mechanism.
Ključne besede: pressureless spark plasma sintering, electronic ceramics, numerical simulations
Objavljeno v DiRROS: 03.09.2025; Ogledov: 805; Prenosov: 795
Celotno besedilo (11,24 MB)
Gradivo ima več datotek! Več... |
