1. Hydration and carbonation behaviour of selected recycled materials from SloveniaVesna Zalar Serjun, Primož Oprčkal, Anton Meden, Marta Počkaj, Romana Cerc Korošec, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: The European Union’s shift towards a circular economy emphasizes the substitution of virgin materials with recycled alternatives, particularly in the construction sector, which can accommodate large volumes of industrial by-products. Ashes from coal, biomass, paper sludge, and co-combustion processes are abundant secondary materials whose variable chemical and mineralogical compositions necessitate careful assessment to enable safe and effective reuse.This study investigates the hydration behaviour and early carbonation potential of ashes of different origin. The ashes were characterized using X-ray fluorescence, X-ray diffraction, and scanning electron microscopy coupled with energy-dispersive spectroscopy. Hydraulic reactivity was evaluated by preparing ash pastes at a 1:1 water-to-ash ratio and monitoring hydration product formation over time using XRD. Carbonation of co-combustion ash was studied under controlled CO₂ conditions (2 % CO₂, 50 % RH, 20 °C ± 1 °C) at different moisture contents (0 wt.%, 10 wt.%, 20 wt.%, and 40 wt.%) and early curing times (0 hours, 1 hours, 4 hours, and 24 hours).Results indicate distinct differences among the ashes. Paper sludge ash exhibited the most extensive formation of calcium aluminate hydrates, coal and co-combustion ashes showed moderate hydration, while biomass ash produced only minor secondary phases. Carbonation of co-combustion ash proceeded concurrently with hydration, with lime depletion and calcite formation enhanced by higher moisture and longer curing. These coupled processes influenced both the kinetics and composition of hydration products. The findings demonstrate the potential of diverse combustion ashes for valorisation in construction materials and provide insight into their reactivity under early-age hydration and carbonation conditions, supporting circular economy initiatives.
Ključne besede: circular economy, ashes from combustion, hydraulic activity, carbonation, phase composition, amorphous phase
Objavljeno v DiRROS: 14.01.2026; Ogledov: 83; Prenosov: 40
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2. The formation and properties of large-surface-area intergranular mesoporous Al2O3 particlesKlara Šparlek, Romana Cerc Korošec, Goran Dražić, Anton Meden, Erika Švara Fabjan, 2025, izvirni znanstveni članek Povzetek: Mesoporous γ-Al2O3 with pores formed between nanocrystals was synthesized via the hydrothermal method, varying the ethanolamines (monoethanolamine, diethanolamine, triethanolamine), pH values (6.5, 7.5, 8.5) and the temperature of the thermal treatment. Characterization techniques, including nitrogen physisorption, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric-differential scanning calorimetry-mass spectrometry (TG-DSC-MS), and transmission electron microscopy (TEM), were employed to study the textural and structural properties of the materials. Thermal treatment at 500 ◦C produced mesoporous γ-Al2O3 with pores formed between nanoparticles. The materials synthesized with triethanolamine exhibited the narrowest pore size distribution and the highest specific surface area, particularly at higher pH values. The thermal treatment temperature significantly influenced the textural properties and crystallinity, with γ-Al2O3 retained up to 900 ◦C and the transformation to non-porous α-Al2O3 occurring at 1300 ◦C. These results demonstrate the critical role of synthesis parameters in understanding and optimizing the pore size and phase stability of mesoporous alumina.
Ključne besede: mesoporous Al2O3, hydrothermal method, intergranular porosity, ethanolamines, influence of pH, temperature of thermal treatment
Objavljeno v DiRROS: 17.11.2025; Ogledov: 231; Prenosov: 148
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3. Nanostructure-induced functional combination of vanishing magnetostriction and magnetic softness in ferromagnetic ▫$(GaNi)_xCoCrFe (x = 0.4–1.6)$▫ high-entropy alloysJože Luzar, Andreja Jelen, Juraj Nálepka, Saeid Salari, Primož Koželj, Stanislav Vrtnik, Peter Mihor, Julia Petrović, Magdalena Wencka, Goran Dražić, Anton Meden, Janez Dolinšek, 2024, izvirni znanstveni članek Ključne besede: multi-phase alloys, multi-scale structured materials, magnetic softness, nanomagnetism
Objavljeno v DiRROS: 25.09.2025; Ogledov: 360; Prenosov: 191
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6. Periodic anti-phase boundaries and crystal superstructures in ▫$PtCu_3$▫ nanoparticles as fuel cell electrocatalystsAna Rebeka Kamšek, Anton Meden, Iztok Arčon, Primož Jovanovič, Martin Šala, Francisco Ruiz-Zepeda, Goran Dražić, Miran Gaberšček, Marjan Bele, Nejc Hodnik, 2023, izvirni znanstveni članek Objavljeno v DiRROS: 28.08.2023; Ogledov: 1619; Prenosov: 860
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