1. The role of relative humidity on crystallization of calcium carbonate from calcium acetoacetate precursorAndreja Pondelak, Francesca Rosi, Celeste Maurich, Costanza Miliani, Srečo D. Škapin, Andrijana Sever Škapin, 2019, original scientific article Abstract: Calcium acetoacetate, Ca(OAcAc)2, was exposed 7, 30 and 365 days to different values of relative humidity (33%, 48%, 75% and 96%) at 40 °C in order to study its transformation to CaCO3. The resulting Ca(OAcAc)2 decomposition and the time dependence of the phase transformations were monitored and critically evaluated by Fourier transform infrared spectroscopy, field emission scanning electron microscopy and X-ray powder diffraction. The impact of relative humidity on CaCO3 polymorph formation was thoroughly assessed. In all of the conditions used and for all ageing periods, the formed crystal structure is found to be vaterite. At the lowest relative humidity (33%), the amorphous CaCO3 remains more or less almost untransformed even after one year of exposure. It is proposed that the reason for the stability of amorphous CaCO3 is due to the limited amount of physisorbed water on the surfaces of the particles, which is considered the driving force for its transformation. However, the carbonation process is faster in the case of the highest humidity (96%). The findings are not only important for better solutions in the field of cultural heritage, but also shed new light on the fundamental mechanism of CaCO3 crystallization. Keywords: calcium acetoacetate, relative humidity, carbonation, amorphous carbonate, vaterite, mechanism Published in DiRROS: 22.11.2023; Views: 288; Downloads: 137 Full text (6,55 MB) This document has many files! More... |
2. Catalytic lignin valorisation by depolymerisation, hydrogenation, demethylation and hydrodeoxygenation : mechanism, chemical reaction kinetics and transport phenomenaTina Ročnik, Blaž Likozar, Edita Jasiukaityte, Miha Grilc, 2022, review article Keywords: lignin, valorisation, depolymerisation, mechanism, kinetic modelling, transport phenomena Published in DiRROS: 01.07.2022; Views: 543; Downloads: 388 Full text (5,90 MB) This document has many files! More... |
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5. Photocatalytic, electrocatalytic and photoelectrocatalytic degradation of pharmaceuticals in aqueous media : analytical methods, mechanisms, simulations, catalysts and reactorsBelisa Alcantara Marinho, Luka Suhadolnik, Blaž Likozar, Matej Huš, Živa Marinko, Miran Čeh, 2022, review article Keywords: advanced oxidation process, persistent organic compounds, pharmaceutical by- products, degradation mechanism, reactor design, analytical methods Published in DiRROS: 10.03.2022; Views: 632; Downloads: 508 Full text (11,34 MB) This document has many files! More... |
6. Catalytic hydrocracking reactions of tetralin biomass tar model compound to benzene, toluene and xylenes (BTX) over metal-modified ZSM-5 in ambient pressure reactorAndrii Kostyniuk, David Bajec, Blaž Likozar, 2022, original scientific article Keywords: catalytic hydrocracking reactions, ring opening mechanism, model biomass tar, benzene/toluene/xylenes (BTX), metal-doped HZSM-5 zeolite material, deposited coke deactivation Published in DiRROS: 10.03.2022; Views: 662; Downloads: 505 Full text (5,34 MB) This document has many files! More... |
7. Mechanisms of copper-based catalyst deactivation during CO [sub] 2 reduction to methanolAnže Prašnikar, Andraž Pavlišič, Francisco Ruiz-Zepeda, Janez Kovač, Blaž Likozar, 2019, original scientific article Keywords: catalyst deactivation, methanol synthesis, deactivation mechanism, modelling Published in DiRROS: 24.11.2020; Views: 1310; Downloads: 970 Full text (4,46 MB) This document has many files! More... |
8. A review of methane activation reactions by halogenation : catalysis, mechanism, kinetics, modeling, and reactorsDavid Bajec, Matic Grom, Damjan Lašič Jurković, Andrii Kostyniuk, Matej Huš, Miha Grilc, Blaž Likozar, Andrej Pohar, 2020, review article Keywords: methane, halogenation, catalysis, density functional theory, kinetics, mechanism Published in DiRROS: 16.04.2020; Views: 2086; Downloads: 1339 Full text (3,75 MB) This document has many files! More... |
9. Postulates for validating TLR4 agonistsMateja Manček Keber, Roman Jerala, 2015, review article Abstract: TLRs play a central role in the innate immune response, recognizing a variety of molecular
structures characteristic of pathogens. Although TLR4, together with its co-receptor
myeloid differentiation-2 (MD-2), recognize bacterial LPS and therefore Gram-negative
bacterial infections, it also plays a key role in many other pathophysiological processes,
including sterile inflammation and viral infection. Specifically, numerous endogenous
agonists of TLR4 of notably diverse nature, ranging from proteins to metal ions, have
been reported. Direct activation of a single receptor by such a range of molecular signals
is very difficult to explain from a structural and mechanistic point of view. It is likely
that only a subset of these directly activate the TLR4–MD-2 complex. We propose three
postulates aimed at distinguishing the direct agonists of TLR4 from indirect activators.
These postulates are as follows: (i) that the agonist requires the TLR4/MD-2 receptor complex;
(ii) that agonist formed synthetically or in situ must activate the receptor complex
in order to eliminate artifacts of contamination by other agonists; and (iii) that a specific
molecular interaction between the agonist and TLR4/MD-2 must be identified. The same
type of postulates can be applied to pattern recognition receptors in general. Keywords: TLR4 agonists, molecular mechanism, ligand recognition Published in DiRROS: 26.01.2015; Views: 4934; Downloads: 461 Link to file |